| Subject | Date Asked |
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| Organic Chemistry | 8/1/2009 |
Q: How does addition reaction work? For example, how do I solve CH3-CH=CH2 + Cl ? (Propene reacts with ...
A: You are talking about addition to a double bond. And, probably, addition of HCl, correct? (Cl by ...
|
| Stoichiometry | 7/28/2009 |
Q: I have read your Instructions. This question is from the textbook, I don't want you to solve it, I ...
A: This question is asking you to convert length measurements into a volume, the volume to a mass, and ...
|
| Energies in Chemistry | 7/27/2009 |
Q: i have read that when an electron add up into a atom energy is released eg--when an electron is ...
A: I'm sorry, I was away from my computer for a few days. In chemistry we are always looking at and ...
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| supplements nutrition | 7/25/2009 |
Q: there is a supplement choline citrate with glycerine all in the same liquid bottle.they claim when ...
A: It is possible to have a formulation that is neutral on the outside and with charges on the inside. ...
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| bubbling reaction | 7/1/2009 |
Q: Why does Airborne or Alka-seltzer effervesce faster in hot water than in cold? A post on this site ...
A: I'm not sure what the gas produced in Airborne is, but I assume it is the same as Alka-selzer, which ...
|
| Science | 3/13/2009 |
Q: How might you tell if a food contains an acid as one of its ingredients?
A: There are a few ways. One, look at the label! If you have a packaged food they are required to ...
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| solubility | 3/11/2009 |
Q: as the amount of solute increases why we see that the temperature at which crystallization occurs ...
A: There is an unwritten assumption in your question that I'm going to state explicitly. We are ...
|
| Wavelength and amino acids | 3/9/2009 |
Q: My name is Daniel and I am a 1st year med student. I recently studied that there is some relation ...
A: Neither amino acids nor UV/IR/VIS absorbance spectroscopy are my particular areas of expertise, but ...
|
| chemistry | 3/8/2009 |
Q: why carbon does not form 4 bonds with other carbon?
A: I assume you are curious about why carbon doesn't form quadruple bonds, since it commonly forms 4 ...
|
| Redox equations | 3/3/2009 |
Q: How do i balance a redox equation using the half-reaction method? Ex. MnO4-1 + C2O4-2 ----> Mn+2 + ...
A: Sorry to take so long in responding to your question. Redox reactions are in some ways easier to ...
|
| Chemistry ( writing molecular equations) | 2/25/2009 |
Q: I need help with writing molecular, complete ionic, and net ionic reaction equations 1. Potassium ...
A: First, let me be clear - I can't give you the answers for 1-15. What I can do is explain what these ...
|
| Markers | 2/19/2009 |
Q: Does the permanency of markers depend on the brand of marker?
A: Probably. Each brand will have its own formulation, and that may affect the markers' performance. ...
|
| convert from ng/mL to nmol/L | 2/16/2009 |
Q: How do you convert from ng/mL to nmol/L?
A: There are basically two parts: you need to convert the mL to L and the ng to nmol. Let's start with ...
|
| periodic table o | 2/15/2009 |
Q: ..i had a question regarding the reactivity of metals and alloys on the table..how do you know by ...
A: You can't. Not with out knowing anything else. Some columns are predictable - the noble gases ...
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| Covalent bonds | 2/14/2009 |
Q: Kristen, I am a volunteer science teacher and need some help. Have a BS, but cannot remember -- ...
A: Yep, polymers do have covalent bonds. I can't think of any ionic polymers, I think all are ...
|
| Lewis acid/base | 2/13/2009 |
Q: the thing that is troubling me is that NO2 is not (NO2)- does that change it from being considered ...
A: Lewis bases are electron pair donating and lewis acids are electron pair accepting. So, whether NO2 ...
|
| Resonance Effect | 2/11/2009 |
Q: Chlorine is an electron withdrawing group. But still it activates benzene ring upon substitution ...
A: As your subject line suggests, this is all due to resonance. Let's start with the facts. A ...
|
| Chemistry Acids | 2/3/2009 |
Q: Why did the Hydrochloric Acid called Muriatic Acid? Spirit(s) of Salt? Chlorane? ANSWER: Hi Raigou, ...
A: Boric acid is a different compound. It is present in seawater, but isn't the same as hydrochloric ...
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| Organic chemistry | 2/1/2009 |
Q: I was wondering if you could help me with the concept of acidity of alcohols? What does it depend ...
A: Yes, what you describe is correct. The most dramatic example is benzene and phenol. Benzene's 6 ...
|
| Chemistry Acids | 1/31/2009 |
Q: Why did the Hydrochloric Acid called Muriatic Acid? Spirit(s) of Salt? Chlorane?
A: I think you are asking why hydrochloric acid has different names? If that is your question here is ...
|
| Analytical chemistry | 1/30/2009 |
Q: I am a third year student in the National University of Lesotho and would like to know ways in which ...
A: I'm not sure what you mean by formality - this is not a term I'm familiar with. However, I can help ...
|
| marker removal | 1/27/2009 |
Q: How can I remove dry erase marker marks completely from a refrigerator? I have tried so very many ...
A: I know exactly what you are talking about. However, I may not be the best one to answer this ...
|
| Effects of UV radiation on organic dyes | 1/26/2009 |
Q: I am inquiring about the molecular properties in organic dyes that either protect or are prone to ...
A: Often, the color of organic dyes is a result of conjugated double bonds. This means that you have a ...
|
| evaporation/chemical removal | 1/25/2009 |
Q: I have a solution of water and dissolved minerals, and I wish to evaporate the water to leave behind ...
A: I can think of two ways off the top of my head. One, use a vacuum system. This is probably not an ...
|
| Dry etching question | 1/23/2009 |
Q: I am an undergraduate majoring in the engineering field. Recently, I stumbled upon a problem while ...
A: According to its MSDS, CF4 is: Stable. Incompatible with zinc, alkaline earth metals, Group I ...
|
| Epsom Salt Crystals | 1/22/2009 |
Q: "My question is about making Epsom salt crystals. I would like to know if changing the amount of ...
A: The best way to control the size of crystals is to control the speed at which they form. The slower ...
|
| q | 1/17/2009 |
Q: we know that quality of gold is expressed in carrat. sir, plz tell me that what is this carrat and ...
A: In the United States and Canada, carat is used for gemstones and karat for gold. I don't know if ...
|
| chemistry | 1/13/2009 |
Q: how is pigment important in chemistry?????????????
A: Pigments are very interesting molecules. They provide color by reflecting some colors and absorbing ...
|
| Rutherford bombarded | 1/12/2009 |
Q: Rutherford bombarded gold foil with alpha particles. How did the results of this experiment lead to ...
A: When this experiment was first performed the prevailing view of the atom was the 'plum pudding ...
|
| magnesium iodide | 1/5/2009 |
Q: i'm in 9th grade. I thought magnesium iodide was ionic but when i looked at the electronegativity ...
A: You are right, MgI2 is considered an ionic compound. Something to keep in mind is that covalent and ...
|
| Chemistry | 1/4/2009 |
Q: I did this practical where I titrated 10.0cm3 of 0.05cm3 sulphuric acid against Borax solution of ...
A: I looked around a bit online to see if I could find any other side-products. Nothing came to light. ...
|
| pH | 12/30/2008 |
Q: I know the pH of water at 25 degrees celsius is 7, but would increasing the temperature lower the ...
A: The pH of water can change with temperature, and the reason is that the dissociation of water is ...
|
| atoms | 12/28/2008 |
Q: hope your well.. i just needed your help in helping me answer a qestion. i need to identify the ...
A: Sure. Metallic bonding is probably the most abstract bonding concept, so it isn't surprising that ...
|
| atoms | 12/23/2008 |
Q: hope your well.. i just needed your help in helping me answer a qestion. i need to identify the ...
A: Atoms can form 3 types of bonds: covalent, ionic and metallic. Covalent bonds are where electrons ...
|
| bonding | 12/20/2008 |
Q: Respected ma'am iam a student of class 11 In a polar covalent, even if the molecule is not symmetric ...
A: Yes, as long as you do not have an ion, in a covalently bonded molecule the overall charge will be ...
|
| stoichiometry | 12/11/2008 |
Q: citric acid(lemon juice) has the molecular formula C6H8O7. A 0.25 g of sample of citric acid ...
A: The answer is 3, citric acid is a triprotic acid. But I'm unsure of how you are supposed to get to ...
|
| atomic make up of phosphorus | 12/10/2008 |
Q: We have to make a model for school showing the number of protons & neutrons in phosphorus. We can ...
A: It sounds like you could have some fun with this. Beads was definitely a good idea. How about ...
|
| organic chemistry | 12/7/2008 |
Q: Which of the following does not have angle like water: 1. NO2 2. SiO2
A: Water is a bent molecule. The hydrogen atoms attach to the oxygen at an angle of ~104.5 degrees. ...
|
| Covelant Bonding? | 11/11/2008 |
Q: I am having a hard time figuring the following questions out and was hoping you could help me a ...
A: It seems that some of these may be homework questions, so I will try to help you think about them ...
|
| Organic Chemistry | 11/9/2008 |
Q: Why are sodium and chloride ions bigger than sodium and chloride elements and why are oxygen and ...
A: The volume of an atom or ion depends on the configuration of its electrons. THis is because the ...
|
| blending odors | 11/5/2008 |
Q: Kristian, First, thank you for whatever help you can give me. I have had HS chemistry and 2 ...
A: I'm afraid that I won't be able to help you with this. If you can smell something, then it is ...
|
| Ionic Bonding? | 11/4/2008 |
Q: When Na loses a e- it shrinks and the Cl+ grows in size correct? Does that say anything about the ...
A: Here are the answers to your1) Yes. 2) Before the electron was lost from Na it was in the outermost ...
|
| Repulsion | 11/3/2008 |
Q: I know that when we put shampoo in our hair because of the acidity of it that will give hair a (+) ...
A: I think that I may not understand your question. Therefore, I'm going to describe what shampoo is, ...
|
| Chemistry Help | 11/2/2008 |
Q: I'm just studying for a Chemistry Midterm for a chem 101 class, and im having difficulty ...
A: Sure, all you need to learn here is how to get the units to help you. You want a volume in mLs. ...
|
| SOLUTIONS | 10/31/2008 |
Q: TAKING ORGANIC AND BIOCHEMISTRY. I AM CONFUSED ABOUT SOLUTIONS. I DO UNDERSTAND WHAT A SOLVENT AND ...
A: I think I can help you. First, though, I wanted to let you know that in online communications all ...
|
| chemistry | 10/22/2008 |
Q: What do the protons, neutrons and electrons look like after hydrogen and oxygen become water?
A: The protons and neutrons do not change. The electron orbitals shift to form water's molecular ...
|
| ionic compounds | 10/21/2008 |
Q: i'm in 9th grade and i was wondering why ionic compounds with charges is so hard to break apart ...
A: I'm not sure I understand you correctly. Let's compare an ionic compound (salt - NaCl) with a ...
|
| Hydrogen gas, ml to mmol | 10/18/2008 |
Q: How do I convert hydrogen gas from ml to mmol taking barometric pressure and temp into ...
A: I think this is a case where you need to assume that H2 will behave as an ideal gas, and use the ...
|
| Synthesizing copper (II) hydroxide | 10/17/2008 |
Q: What do I need to do to synthesize one gram of Copper (II) Hydroxide? I have access to the following ...
A: The easiest method is to find some weathered, green copper. This green patina is actually copper ...
|
| CHEM272 Concept | 10/16/2008 |
Q: How do you calculate the buffering capacity in acid-base chemistry? I am having trouble ...
A: It isn't clear to me what you mean by 'having trouble incorporating molarity.' I'll explain ...
|
| Balancing Redox Equations | 10/8/2008 |
Q: How do you balance this using oxidation-reduction? KClO3 + HCl --> KCl + H2O + Cl2 + ClO2 Everytime ...
A: I'll try and help you. First thing is to decide what is oxidized and what is reduced. We can ...
|
| Writing Empirical formulas | 10/7/2008 |
Q: Can you please help me? I am so confused and i am running out of time (yes this is for class). How ...
A: An empirical formula is ratio of the atoms in a molecules - it is not necessarily the same as the ...
|
| EAS | 10/4/2008 |
Q: i just wanna ask on what is the effect (if any) of the solvent polarity on the rate of bromination ...
A: The bromination of a benzene normally occurs with a bromo-iron catalyst which helps to create a ...
|
| periodic table | 9/28/2008 |
Q: . i need your help to help me understand the patterns in group 1-7 in the periodic table?.. what am ...
A: The patterns in the periodic table have to do with the chemistry of each column. (This is primarily ...
|
| Introduction to Organic and Biological Chemistry | 9/26/2008 |
Q: my question is about polarity. I understand that a polar molecule is one that has a negative charge ...
A: This is a good question - and pertinent to me because I am doing some column chromatography as I ...
|
| Princeton Review | 9/23/2008 |
Q: I just finished a SAT Chemistry Test provided by the Princeton Review, and I'm confused about the ...
A: (1) I'm not entirely sure on this one, since I wasn't able to find an exact answer in any reference ...
|
| 2,3,7,8-TCDD | 9/22/2008 |
Q: . Plz tell me with which chemicals can 2,3,7,8-TCDD react??
A: 2,3,7,8-TCDD is an extremely persistent molecule. However, as an aromatic compound, which is quite ...
|
| Princeton Review | 9/20/2008 |
Q: Kirsten. Thank you so much for the detailed explanation last time. However, I 've encountered some ...
A: I'm glad that my answer was helpful last time! (3) Yes - this is true! The reason is because He ...
|
| Calculations | 9/19/2008 |
Q: Kirstin, I have a few questions involving stoichiometry that I don't understand, please help to ...
A: I'm happy to try and help! (1) Ok, let's start from basics. Molarity is moles per liter, that is ...
|
| Which pop contains the most fizz? | 9/18/2008 |
Q: When we were reading this we were not sure if we should use all the same type of pop (not diet) or ...
A: I'm not sure what you are trying to do... If you want to test and see which brand has the most fizz ...
|
| amides | 9/16/2008 |
Q: i have to do a report on amides, with the main focus being nomenclature. i looked up wikipedia but ...
A: Wikipedia is actually not a bad place to start. Although you want to check the information that you ...
|
| Biochemistry | 9/13/2008 |
Q: I was wondering if you could help me find a method to calculate a net charge on any peptide. I am, ...
A: I haven't had much biochemistry, so this was an unfamiliar term to me. However, I have looked into ...
|
| Phenoxy acetic acid | 9/12/2008 |
Q: What are the properties of Phenoxy acetic acid?
A: H Abeer, Phenoxy acetic acid, more commonly phenoxyacetic acid, is an organic compound. It ...
|
| chemistry | 9/10/2008 |
Q: what is the isotopic notation of chlorine
A: I'm a bit confused by your question. To make sure I cover what you want I'm going to go over both ...
|
| just a confirmation | 9/8/2008 |
Q: I haven't taken biochem but am just learning some terms to get myself ready. Would an example of ...
A: My biochemistry is also limited, but I will try to help you. It might be better to ask an expert ...
|
| organic chem | 9/7/2008 |
Q: i barely passed chem two yrs ago but now i'm stuck in organic chemistry with the same teacher, i ...
A: It is not uncommon to have some anxiety about organic chemistry, lovingly called orgo. Especially ...
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| Physical Chemistry | 9/3/2008 |
Q: I was doing practice problems in my textbook and the answer for a certain problem is listed but I ...
A: I just added that section about homework - perhaps I should re-write it! I wrote it after receiving ...
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| ppm formula | 9/2/2008 |
Q: I'm in the wellfield maintenance industry. I have a question regarding parts per million formulas. I ...
A: Your question about part per million formulas is a good one. They can be in terms of mass/mass, ...
|
| Leength of a side of square.. | 9/2/2008 |
Q: I am really stuck on this question.. Density of gold = 19.3g/cm3 A 3.4 mg piece of gold is ...
A: In this question you are given a bunch of information and you have to re-arrange it to get the ...
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| chemistry | 8/31/2008 |
Q: Iron(III) phosphate dihydrate, it contains 1 iron, 1 phosphorous, 6 oxygens and 4 hydrogens. What ...
A: You are writing the the formula for an ionic molecule. And, in this case, for a hydrated molecule. ...
|
| chemistry | 8/29/2008 |
Q: Tell me about the valency of Titanium how does it make one of its compound Titanium ...
A: Titanium is a transition metal - the 2 outer electrons are in the shell 3d. This means that valence ...
|
| Soap analysis | 8/26/2008 |
Q: i now need to produce soap by monoglyceride. i use oleic acids to produce monoglyceride. so if i use ...
A: I think that you need to find an analytical method for soap analysis. Check the literature - ...
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| mass determination | 8/25/2008 |
Q: If samples are dried in the oven and their mass id determined before reaching room temperature, will ...
A: If you are discounting condensation of water, then the temperature at which the mass of an object is ...
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| carbohydrats | 8/21/2008 |
Q: Kristin We set the natural sciences teachers working in a workshop integrating technology in ...
A: Aamina and Khtam, You can just call me Kristin - no title is needed (and incidentally, I'm a Ms. ...
|
| Hybridization | 8/19/2008 |
Q: i'm a bit confused about something. How do you know what hybridization occurs for different ...
A: I'm so sorry to have taken this long to answer your question. To begin, I'm going to assume that ...
|
| Suagr dissolved in water and total mass | 8/19/2008 |
Q: Heelo, Im a little confused when you dissolve sugar in water does the law of conservation of mass ...
A: Yes, the conservation of mass applies - it always applies! (Well, we could split hairs over the ...
|
| carbon | 8/18/2008 |
Q: Can I get pure carbon by heating sugar? How hot should it be? I heated sugar on a charcoal grill. I ...
A: Normally when we heat sugar it will caramelize, then burn. When it burns we produce CO2 as well as ...
|
| solubility | 8/18/2008 |
Q:
A: I'm sorry Sherry! I gave you the answer to the wrong question! Solubility is temperature ...
|
| Organic Chemistry | 8/15/2008 |
Q: How are you? I need help in these questions. 1> What is the nature of intermolecular force? 2>What ...
A: I can definitely answer your second question. I'm not entirely sure what you mean in question ...
|
| Electropositivity | 8/14/2008 |
Q: Which metal is more electro positive among potassium and lithium?
A: Electropositivity measures an elements ability to donate electrons. It is the opposite of ...
|
| urea cycle | 8/13/2008 |
Q: which compounds involved in the urea cycle are also involved in the krebs cycle?
A: The urea cycle converts ammonia to urea. The Krebs cycle interconverts CO2 and larger organic ...
|
| Chemistry | 8/12/2008 |
Q: What is the formula of magnesium citrate, as an ionic compound of Mg2+ and citrate ion C6H5O-3 7 ...
A: You are very close! It is MgC6H6O7. It is ionic, made of Mg2+ and C6H6O7(2-). With any compounds ...
|
| condensation | 8/9/2008 |
Q: If you drop iceblocks into a glass bowl of water, which would be the correct answer? 1. The glass ...
A: The reason that glasses of cold drinks 'sweat' on a hot summer day is actually #2. When you put ice ...
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| organic chem | 8/5/2008 |
Q: just wanna ask.. what compound produces the smell of feet and breath?
A: Smelly feet and breath are both actually caused by bacteria. So it is the compounds that these ...
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| Concentration Calculation | 7/31/2008 |
Q: If 10g of soil sample is extracted with 20ml MeOH. Then 0.5 mL of the methanol extract is transfered ...
A: What you are describing is a common method of extracting soil. However, in order to know what the ...
|
| Electrolysis | 7/30/2008 |
Q: What is produced when a direct current is passed through a electrolyte solution of Magnesium Sulfate ...
A: I just wrote you an answer, and I don't know what happened to it. But I'll try to recreate what I ...
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| Chemistry | 7/30/2008 |
Q: What is the role of bicarbonate ion in control of pH in blood ? plz explain or send links or site ...
A: Bicarbonate acts as a buffer in the blood to maintain a stable pH. Blood in the human body needs to ...
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| Alcohols | 7/1/2008 |
Q: My questions are Islam based: 1. Alcohol used for drinking is necessarily ethyl alcohol or may be ...
A: I'm not going to get into point #2 - I think this is more of a religious issue. However, through ...
|
| Will we taste the same thing when we taste the food with same flavour | 6/25/2008 |
Q: Will we taste the same thing when we taste the food with same flavour in our mouth? maybe not ...
A: I just want to say up front - I've wondered these questions too! I'm not an expert on taste or ...
|
| Diffusion as rate determining step | 6/15/2008 |
Q: This question relates to swimming pool chemistry. Since the stirring in the pool is very slow, I ...
A: If we make your assumption, that diffusion will be the rate determining step then we need to think ...
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| baking soda + detergent or soap | 6/14/2008 |
Q: Just a quick and probably easy question for you: is there anything in soap or commercial laundry ...
A: Ok - point taken. I think that in the example you give the soaking may be what helps rid the ...
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| The Effect of NaCl on BP of Water | 6/14/2008 |
Q: Hey Kirsten :-) I am doing some research about boiling point elevation and was hoping that you ...
A: Sure Chris, What I meant was that in order for a packet of water to evaporate all the salt that is ...
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| baking soda + detergent or soap | 6/13/2008 |
Q: Just a quick and probably easy question for you: is there anything in soap or commercial laundry ...
A: I'm actually going to veer around your chemistry question and answer a different one. Is baking ...
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| The Effect of NaCl on BP of Water | 6/11/2008 |
Q: Hey Kirsten :-) I am doing some research about boiling point elevation and was hoping that you ...
A: I just answered your question and somehow it got lost in the ether! I will try and recreate my ...
|
| Help with Silver and Aluminium REDOX? | 6/9/2008 |
Q: I was just wondering about the chemistry involved in the process of cleaning silver tarnish using ...
A: I think you are looking at two different ways of removing silver tarnish. I'll start with the ...
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| Chemistry | 6/7/2008 |
Q: What are called 'Bases'?
A: Bases are a class of chemicals that raise the pH of a solution. That is, they decrease the amount ...
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| Ethanol concentration | 6/6/2008 |
Q: How can i find the concentration of ethanol in its binary solution with hexane? Thank you ANSWER: ...
A: Oh yes, definitely! You will need a system optimized for the measurement of very small molecules. ...
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| Ethanol concentration | 6/6/2008 |
Q: How can i find the concentration of ethanol in its binary solution with hexane? Thank you
A: As you probably know, a binary solution is a mixture of two miscible liquids - meaning they are ...
|
| boric oxide titration | 6/5/2008 |
Q: I'm doing a titration using NaOH to determine boric oxide content in water. I have seen a lot of ...
A: If your boric acid is listed as either B(OH)3 or B(OH)4-, then yes it is a 1:1 ratio - you've got ...
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| Re: cream of tartar, ions and sucrose | 6/3/2008 |
Q: I'm Julian Krick, a student from Germany (Unfortunately I haven't found any German ...
A: You are right, Julian! I should have 'spoken' more carefully. Citric acid does have 3 carboxylic ...
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| Re: cream of tartar, ions and sucrose | 6/3/2008 |
Q: I'm Julian Krick, a student from Germany (Unfortunately I haven't found any German ...
A: I'm working from home today which means that I have my food science/cooking science books on hand. ...
|
| question | 6/2/2008 |
Q: It's me again! You helped me earlier with a query, and I have my exam on Wednesday , I only do this ...
A: It sounds like you are busy. What you need to consider here is how acid will affect this solution, ...
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| cream of tartar, ions and sucrose | 6/1/2008 |
Q: I'm Julian Krick, a student from Germany (Unfortunately I haven't found any German ...
A: It certainly sounds like you have done your research! Let me see if I can add something. If you ...
|
| Re-do of Previous question | 5/29/2008 |
Q: I had my math wrong by an order of magnitude; but the question is still with me ... One mile of ...
A: I believe the discrepancy is a result of the reaction of the gasoline with oxygen during combustion. ...
|
| Converting ion concentration to grams of solvent | 5/29/2008 |
Q: I've spent hours Googling for a method of converting ion concentration in an aqeous solution to ...
A: Absolutely - you can definitely do this. When you calculated the amount of potassium in the ...
|
| chem | 5/26/2008 |
Q: This is one of the 2008 AP chem exam questions. we already took it so I'm assuming it's ok to ask ...
A: I think that you over thought the question - a mistake I've make many times! In this reaction you ...
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| organic | 5/22/2008 |
Q: hydrogen bonding lowers vaporising tendency of organic liquids ,although exhibiting H -bonding why ...
A: I think you are asking why ammonia and ethyl alcohol are volatile at room temperature despite the ...
|
| molarity | 5/20/2008 |
Q: When 8.00 mL aliquots of a solution of HCl were titrated with 0.109 mol L-1 NaOH using ...
A: I always feel badly about turning down obvious homework questions because people obviously ask ...
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| Calculating concentration | 5/19/2008 |
Q: I have to calculate the concentration of iron in a vitamin pill and I am stuck on calculating the ...
A: I'm trying to understand your methods here. I'm going to just assume that you used some sort of ...
|
| Organic Chemistry | 5/16/2008 |
Q: Arrange the following according to decreasing reactivity:- 1.C6H6-NH2 2.C6H6-NH-R 3.C6H6-NR2 where ...
A: I turned your question down because it looks too much like a homework question and I don't feel ...
|
| pH chemistry | 5/9/2008 |
Q: How can I find the theoretical pH of 0.5M Na3C6H5O7? I don't know the dissociation/hydrolysis ...
A: I don't feel comfortable just giving the answer, but I can give you a BIG hint. The chemical in ...
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| molar calculations | 5/9/2008 |
Q: I am a Biology graduate (BSc 2:1) and am returning to do a degree in Dentistry in September, but I ...
A: Congratulations on your successes, and good luck for dentistry school! Let me see if I can help you ...
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| Acyl Acetyl difference? | 5/8/2008 |
Q: What is an acyl and what is an acetyl? What is the difference between them? Thank you for your time ...
A: An acyl and acetyl are closely related. An acyl is a carbon chain where the last carbon is ...
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| Methyl isocyanate | 5/5/2008 |
Q: I am Tahira studing in University of Tokyo. My major is Sustainability Science.I have one question. ...
A: I'm not that familiar with the uses of methyl isocyanate, but I did some quick internet searches. ...
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| alkyl hallides | 5/4/2008 |
Q: What are acryl hallides?Pl.can U give it's structure.
A: I'm afraid I don't know if you can import images into these text boxes, so I'm just going to ...
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| Water pH Question | 5/3/2008 |
Q: I have an aquarium tank that is about 50L. Inside the tank, I have several goldfish, frogs, and a ...
A: I'm not entirely sure. Is this a new problem? If so - what changed? If you added something(s) ...
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| Dissolving | 5/1/2008 |
Q: I am studying Biology AS level. The bit about water in my textbook confused me in one respect, and ...
A: That is a good question. Especially since Cl is toxic and Na flames when in contact with water! ...
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| Balancing Equations?? | 4/29/2008 |
Q: I have googled like crazy - and no useful info, so you are my last hope. I am really struggling with ...
A: I can't give you the answer straight out. But, let me help you out with your notation, then I'll ...
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| Balancing Equations?? | 4/29/2008 |
Q: I have googled like crazy - and no useful info, so you are my last hope. I am really struggling with ...
A: Well, first of all, your reaction can't be correct. You can't have sodium bicarbonate as both a ...
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| bleach | 4/24/2008 |
Q: Why does chlorine bleach turn colored clothes pink, but oxygen bleach has no visible effect on the ...
A: It probably depends to some degree on both the strength of the bleach and the type of dye used. In ...
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| stoichiometry | 4/23/2008 |
Q: i am fine working with easier stoich problems but i recently came across one with a polyatomic ion ...
A: I had to investigate the bridge method- it looks like a good way to solve problems! Polyatomic ions ...
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| Glow-In-The-Dark | 4/16/2008 |
Q: Is there any existing or is it possible to create a glow-in-the-dark object that can light as light ...
A: What you are describing is called bioluminescence. It is biology's way of harnessing ...
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| Science Question | 4/14/2008 |
Q: I was wondering how exactly the position of an element (in the Periodic Table) predicts its ...
A: I'm going to assume that you understand how the number of electrons in the outer shell of an atom ...
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| Polymers | 4/12/2008 |
Q: What are polymers and their properties?? Any help gratelfully recieved
A: Polymers are large molecules made up of repeating units called monomers. There are many different ...
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| Rate of reactions | 4/10/2008 |
Q: I know the formula for rate of reaction is rate=k[reactant1]m[reactant2]n My question is what does ...
A: 'k' is the rate constant of the reaction. It is always the same for a given reaction at a specific ...
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| question about titration | 4/8/2008 |
Q: NaCo3+NaOH+NaHCo3 is it posibble to detect a mixture of them by titration and if it wasnt possible ...
A: You are asking about a complicated system - I hope you are ready for a more complicated answer than ...
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| the water / air / finger experiment | 4/2/2008 |
Q: Hoping you can help. I work in a lab but what I know about chemistry could probably fit on an ...
A: Well, I thought this was a pretty great experiment, but wasn't entirely sure of my knowledge on the ...
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| Valence Number | 4/2/2008 |
Q: What is a valence number and how do i find it?
A: A valence number describes the maximum number of bonds an atom can form. Chemical reactivity ...
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| Definition confusion | 3/31/2008 |
Q: What is the difference between Hemi-ketals, Hemi-acetal. acetal & Ketal. Thank you.
A: I had to review this myself. A hemiacetal is the adduct formed from the addition of an alcohol to ...
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| Separation | 3/31/2008 |
Q: Is it possible to separate the acetic acid from the viniger? If so how? Thank you
A: Vinegar is a weak solution of acetic acid. There are probably a few ways to separate the acid from ...
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| Question regarding saltwater battery | 3/27/2008 |
Q: I recently made an air/saltwater battery that requires hydrogen peroxide. I made the battery as ...
A: That sounds really cool! I'll have to remember it as a fun experiment for the future. Here is what ...
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| alcohol evaporation | 3/27/2008 |
Q: My husband and I can't agree. Can a glass that once held alcohol still have "alcohol residue" on ...
A: As a wife who occasionally argues with her husband over matters like these I am afraid to tell you ...
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| Law of Chemistry | 3/25/2008 |
Q: Is this a Law of Chemistry? Is there a name or short phrase that sums up the following Law of ...
A: I don't know of a concise name for this other than the generic, "reaction". The fact that different ...
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| Who made the Discovery | 3/18/2008 |
Q: I have often heard said, Carbon is the basis of all life on Earth. I have been wondering what this ...
A: I'm afraid that the answer I'm going to give might not be very satisfying. Like so many things in ...
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| Biochemistry- Spectrophotometry/ Fluorimetry | 3/14/2008 |
Q: My question is "When and why do molecules fluoresce". None of the information I have searched for ...
A: Fluorescence occurs when a molecule absorbs a photon at one wavelength which causes it to emit a ...
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| CHEMISTRY | 3/13/2008 |
Q: Question is perform the following calculations using the correct number of significant figures and ...
A: I think you may want to revisit this one. Your use of significant figures is not quite right. I ...
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| Chemistry | 3/12/2008 |
Q: How do you work out the highest possible yield of a product?
A: I think by this you mean the theoretical yield. This is when you get total conversion of reactants ...
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| Science Question. | 3/10/2008 |
Q: (I hope I'm in the right category) :). Does the mass of a object change after a phase change? ...
A: Yup, you are in the right category. :) A phase change is when something goes from a solid to a ...
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| 3rd grade activity: atoms & molecules-Part 2 | 3/1/2008 |
Q: You helped me in December to work up a stick/ball activity for 3rd graders. You field a lot of ...
A: Yes - I remember this activity well. I think it sounds like a great activity for 3rd graders. The ...
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| titration? | 2/29/2008 |
Q: C6H5COOH(S) = C6H5COO-(aq) + H+(aq) Ka= 6.46 e-5 Benzoic acid, C6H5COOH, dissociates in water as ...
A: Let me start by helping you with the moles of NaOH used. If 15 mL of a 0.150 M NaOH solution was ...
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| chemical formula | 2/28/2008 |
Q: which acid is stronger, propanoic acid or methanoic acid? justify your anser. i don't think any of ...
A: Yes, in this case it seems that they want you to use what you've learned about how molecular ...
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| Chemistry | 2/25/2008 |
Q: My question is about Percent yield. I know that Percent yield is equal to actual yield/theoretical ...
A: The theoretical number is calculated from the amount of starting materials you have and the ...
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| Molarity & Molarity | 2/24/2008 |
Q: I was just wondering why molality will always have a greater numerical value than molarity? I am ...
A: Molality and molarity are both mole-based concentration units. Molality equals moles per ...
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| What exactly are "flames"? | 2/16/2008 |
Q: What exactly are "flames"? From what I've read about, it's where atoms are rearranging, with a net ...
A: You've asked a number of questions here, and I'll do my best to answer them. Flames are actually ...
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| chemistry lab techniques | 2/6/2008 |
Q: which techniques are used to find the temperature at which the liquid phase and solid phase of a ...
A: I believe that you are referring to determining a substances melting point. Personally, I have only ...
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| gas volumes | 2/5/2008 |
Q: I need to design an experiment which will allow me to measure the volume of a gas. I am trying to ...
A: In answer to a previous question on trying to find out how much carbonation was in a bottle of soda ...
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| Biochemistry | 1/30/2008 |
Q: What is the definition of Fermentation according to Bio chemisty?
A: I've been thinking about your question because I'm not entirely sure what you mean. Fermentation is ...
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| Ozone molecule | 1/28/2008 |
Q: Ozone has a molecular weight of around 48 while oxygen molecule 36. So, why do O3 molecules, instead ...
A: Ozone is destroyed in the stratosphere before it would sink. Prior to the emissions of CFCs, and ...
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| Ozone molecule | 1/27/2008 |
Q: Ozone has a molecular weight of around 48 while oxygen molecule 36. So, why do O3 molecules, instead ...
A: There are two things to consider here, reactivity and density. Although one molecule of ozone is ...
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| half equations and redox | 1/25/2008 |
Q: . I'm really struggling with working out the FeSO4 part of the equation i know its the reducing ...
A: We know that FeSO4 must change into Fe2(SO4)3. What happens to the iron in this half reaction - is ...
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| Chemistry | 1/24/2008 |
Q: why are all the known stable xenon compounds contain xenon bonded only to fluorine, oxygen, or ...
A: I'm not a geologist - but I can take a stab at the first question. I can definitely answer the ...
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| Chemistry | 1/23/2008 |
Q: why are all the known stable xenon compounds contain xenon bonded only to fluorine, oxygen, or ...
A: I'm not entirely sure, but I believe it is because of Xenon's relative non-reactiveness. Fluorine, ...
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| Spectrometry | 1/22/2008 |
Q: Why do fluorescence excitation spectra typicall look identical to absorption spectra?
A: The fluorescence and absorption spectra of a molecule are closely related. The fluorescence ...
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| Colloids and its charge | 1/22/2008 |
Q: ! this is my second question to you today...thank you soo much for your help, my chem exam is day ...
A: I'm sorry to have taken a bit to get back to you - I wrote out a request for explanation and ...
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| iodoform test | 1/22/2008 |
Q: i have a question on the iodoform test. Could you brief me about the conditions for the same? i mean ...
A: It sounds like you have this correct. The iodoform test is testing for the presence of a CH3-CO- ...
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| bohr diagram | 1/20/2008 |
Q: How do I use Bohr Diagram, What is it?
A: A Bohr Diagram is a representation of an atom which places electrons in discrete energy levels ...
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| Blood | 1/19/2008 |
Q: Sir, I want to know that blood is acidic or basic ?? and why ??
A: According to a quick internet search, the pH of blood is just on the basic side of neutral, it is ...
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| biochemistry | 1/18/2008 |
Q: can you explain how the neutral pH7 is derived?
A: The pH scale is a well known measure of pH, with acidic solutions having low values (pH<7) and basic ...
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| analytical chemistry | 1/17/2008 |
Q: what are the things required when carryin out a research on the speciation of heavy metals in ...
A: I think your best bet here is to find a procedure from a published paper. It should give you a list ...
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| Redox Chemistry versus Acid-Base Chemistry | 1/16/2008 |
Q: I'm having trouble understanding the difference between Redox Chemistry and Acid-Base chemistry. For ...
A: The difference between redox and acid-base chemistry is fairly straightforward. Redox reactions, or ...
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| What liquid is lighter than water? | 1/16/2008 |
Q: Well, lets just say that I stopped taking Chemistry after grade 10 and I am currently 25. So could ...
A: I'm trying to think of a liquid that will meet your description. Lighter than water = less dense ...
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| FLUORINE AND CHLORINE | 1/15/2008 |
Q: KRISTIN, HELLO. DOES THE FLUORINE AND CHLORINE IN MUNICIPAL WATER EXIT THE WATER AND THEN ENTER ...
A: Quick hint - take off the caps lock, some people might mis-interpret that as yelling! What your ...
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| amino acids | 1/14/2008 |
Q: I would like to know how I could determine if beans has all 8 amino acids
A: Beans are an excellent source of protein (molecules made up of amino acids). However, there are far ...
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| buffers | 1/13/2008 |
Q: (i don't have background on the subject) Would a solution made by mixing HCl and NaOH be an ...
A: The yes-or-no answer to your question is no. But more importantly, the reason that it won't be an ...
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| Enery Problem. | 1/13/2008 |
Q: I came across an energy problem that looked like this: 2 O3 --> 3 O2 ...H = -427 O2 --> 2O ...
A: I think this is an example of a question where they give you too much info to try and trick you! ...
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| capillary action | 1/12/2008 |
Q: Will liquids with a high viscosity (thick liquids) rise higher or lower in a capillary tube? I did ...
A: Capillary action is controlled by a number of things, not simply viscosity. I had to review this ...
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| chemistry | 1/11/2008 |
Q: if an average atom of sulfur weighs 32.07 aum and how many sulfur atoms are contained in a sample ...
A: This is a common type of problem, and you will encounter many like this in studying chemistry. One ...
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| chemistry | 1/10/2008 |
Q: What are the properties of metals/ What are the properties of nonmentals?
A: There are many ways of characterizing metals and non-metals. Chemically, metals lose electrons to ...
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| London dispersion force | 1/9/2008 |
Q: How is it possible for Londodn dispersion force to exist? I understand that to form London ...
A: For simplicity, I'm going to use atoms to describe this phenomenon, but the same thing applies to ...
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| Molecular shape | 1/9/2008 |
Q: Please explain to me the reason and the name of molecules that have bent shape? How do chemists ...
A: Sorry that it has taken a bit for me to get back to you. Your question deserves a thorough answer, ...
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| science | 1/9/2008 |
Q: why are their millions of carbon compounds
A: I can think of a few reasons. One, carbon is relatively abundant on earth. Two, and perhaps most ...
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| fractional crystallization | 1/7/2008 |
Q: How can temperature change be used to accomplish fractional crystallization? I'm not sure this is ...
A: I don't think that mass would be very helpful. But if you can determine the density of your ...
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| Trans Fats vs. Hydrogenated Plant Oils | 1/5/2008 |
Q: In my chemistry class we were taught that trans fats were created by adding hydrogen atoms to ...
A: You basically have this correct. When we hydrogenated unsaturated fats, trans-saturated fats are ...
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| fractional crystallization | 1/4/2008 |
Q: How can temperature change be used to accomplish fractional crystallization? I'm not sure this is ...
A: What the question appears to be asking is WHY fractional crystallization occurs. The answer has to ...
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| chemical reactions | 1/3/2008 |
Q: how do i write a balaned eqation from this word equation? aqueous silver nitrate + copper metal ...
A: This question is asking you to do a few things. First it wants you to write the species listed as ...
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| soda's carbonation | 12/31/2007 |
Q: I looked at what you wrote about the carbonation of soda and how to see which one has the most but ...
A: The carbonation in soda is from a gas called carbon dioxide. It is normally dissolved in the soda ...
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| Accuracy and Precision | 12/29/2007 |
Q: How to calculate accuracy and precision of this data? 10, 7, 9, 9, 3, 8 Actual value is 6. i ask ...
A: One way is to calculate the standard deviation of the data values for the precision, and compare the ...
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| indigo (dye) production | 12/28/2007 |
Q: i'm currently doing a literature survey on indigo production (how indigo is made from ...
A: I checked my book and it doesn't really provide much on indigo. I'm now not sure where I read about ...
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| indigo (dye) production | 12/27/2007 |
Q: i'm currently doing a literature survey on indigo production (how indigo is made from ...
A: Fascinating topic. Indigo is such an interesting natural product. The one thing that I need to ...
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| Oxygen in the Atmosphere | 12/20/2007 |
Q: Kristin, My name is Zach and I'm writing a speech involving life on extra-solar planets. In my ...
A: You have come across a reality of cutting-edge scientific research: scientists don't always agree. ...
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| Oxygen and Ozone (Trees and Mechanics) | 12/20/2007 |
Q: How exactly do trees convert CO2 into O2? Could this process be emulated by a man made machine? also ...
A: Trees and other plants use CO2 to make their 'food' through photosynthesis. O2 is actually just a ...
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| Science Project | 12/20/2007 |
Q: Which container do you think will hold water hotter longer? Plastic, glass, or aluminum. where is ...
A: I think you should focus your research on how those different materials conduct heat. There are ...
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| organic chemistry | 12/19/2007 |
Q: i am trying to prepare iron edta chelated product with complete solubility ,but solubility test show ...
A: From your description it is difficult to tell exactly what your problem is (no mention of the ...
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| Lewis structures | 12/17/2007 |
Q: I am having difficulty understanding resonance forms. I got the impression from my professor that ...
A: Resonance structures can be a bit confusing. It may be because resonance structures are a way of us ...
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| Solubility tables | 12/14/2007 |
Q: I am attempting to find tables referencing the solubility of SO2 or HCL in DMF (N,N-dimethyl ...
A: Hmm...I'm afraid that I am as well. I would check with the companies that sell these chemicals. ...
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| 3rd grade activity: atoms & molecules | 12/13/2007 |
Q: Kristin, I am the science coordinator for an elementary school, and the teachers have asked me to ...
A: The difference between ionic and covalent bonds might be a bit advanced. I think just showing how ...
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| 3rd grade activity: atoms & molecules | 12/11/2007 |
Q: Kristin, I am the science coordinator for an elementary school, and the teachers have asked me to ...
A: Ok, I think that doing two different types of molecules might be best. Solid, liquids and gases ...
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| HPLC | 12/8/2007 |
Q: How many test sample injections should be injected in case of assay analysis by HPLC? Standard ...
A: I'm not entirely sure what procedure you are looking for. First of all, with your standard, if you ...
|
| school project | 12/6/2007 |
Q: I am trying to find out which soda is more corrosive.Between Diet Dr.Pepper, Dr.Pepper, Fruit Punch, ...
A: First you are going to want to select the type of material for the soda's to corrode. Metal? Tooth ...
|
| dehydration/volume | 12/4/2007 |
Q: Not sure who to ask this question of, but here goes. I know that the human body is mostly water and ...
A: I can definitely appreciate the importance of a good visual aid! I'm just going to do some back of ...
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| DIESEL FUEL DENSITY | 12/4/2007 |
Q: Should there be a significant difference in the density of diesel fuel when there is a difference of ...
A: Not really, but it will change slightly. I guess it all depends on what you mean by significant. ...
|
| Science fair project. HELP!!! | 11/14/2007 |
Q: Does the growth of mold on bread increase or decrease the mass of the bread??? we need to know if ...
A: Molds grow by absorbing food from the matrix that they grow on. So in this case, the mass of the ...
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| organic synthesis of an ester | 11/9/2007 |
Q: in a organic synthesis of an ester, why we wash it with water and sodium carbonate solution? and why ...
A: I'd have to see your procedure, but I think you are neutralizing the acid that is used in the ...
|
| Soda fizz | 11/8/2007 |
Q: Im doing a project on which soda contains the most fizz. To make my hypothesis I have to know that ...
A: Hmm... this could be a tough one. The carbonation in soda is CO2, and it is dissolved in the soda ...
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| physical chemistry | 11/6/2007 |
Q: why the standerd heat of formation of any element in its standerd state is taken as zero.
A: sohrab, This is simply how we define the standard heat of formation. What we are generally ...
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| oxidation numbers | 11/4/2007 |
Q: is the oxidation number the roman numerals only.
A: The oxidation state is often given as the roman numerals, for example Fe(II) is iron in its 2+ ...
|
| Water | 10/20/2007 |
Q: Why does bottled water have an expiration date? I think it's three years from the bottling date.
A: I believe that the reason is pure caution - it is very difficult to ensure that something is ...
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| Absorption of CO2 in the Ocean and It's effects on pH | 10/18/2007 |
Q: I recently read something which claimed that the increased carbon dioxide absorbed in the oceans has ...
A: I'm really glad you asked this question because it is an incredibly important, and not well ...
|
| GENERAL CHEMISTRY | 10/16/2007 |
Q: Just wondering if you could help me with this question. Metal weighs, 13.333g. If the volume of the ...
A: You are trying to find the volume to use in the density formula, correct? Well, what you need to ...
|
| empirical formula | 10/15/2007 |
Q: I recently did a lab in my chem 101 class, on tin iodide. There was a part which required me to find ...
A: An empirical formula gives you the ratio between elements in a molecule. For instance, water is H2O ...
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| calculating concentrations | 10/15/2007 |
Q: my a-level teacher has been away recently, so we have had to try to work this subject out on our ...
A: I had assumed that it had been covered based on the question that you have asked. It will be very ...
|
| Chemistry Basics [I Think] | 10/11/2007 |
Q: What is the mass of a mole of electrons? I need to know because I would like to know also how many ...
A: First of all, let's talk about what a mole is. A mole is simply a unit of measurement, like a gram ...
|
| Bleach Titration | 10/11/2007 |
Q: the percentage of available chlorine (W/V) in the original bleach solution ? i used 0.06M , 13.4 ...
A: What you need to do is first figure out what reactions are going on. In each step, what are the ...
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| calculating concentrations | 10/10/2007 |
Q: my a-level teacher has been away recently, so we have had to try to work this subject out on our ...
A: These are certainly more difficult problems. They require that you use equilibrium expressions to ...
|
| chemical reaction | 10/10/2007 |
Q: I posted a question concerning the reaction of water, bluing, ammonia & salt on a chunk of coal. I ...
A: Yes, I responded with a question because I'm unfamiliar with bluing. I did some 'googling' and it ...
|
| chemistry | 10/9/2007 |
Q: How is this problem done: A certain volume of a 10% glucose solution contains 22.0g of glucose. What ...
A: Well, this gets into a tricky area. The solution is 10% glucose, but is that measured by? Mass? ...
|
| Salt and Sugar | 10/9/2007 |
Q: I am a high school sophmore and my chemistry teacher has offered us a challenge. We need to ...
A: Your question has perplexed me. I think I've heard of this before, but I can't remember the answer! ...
|
| Acid Basr Titrations | 10/8/2007 |
Q: I really need some help with this... I appreciate that it's quite long, but I am really stuck :) 1) ...
A: There are two reasons I'm not going to answer your questions with numbers. (1) I'm not positive ...
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| tough chem problem | 10/7/2007 |
Q: Would you be able to provide me with a little insight as to how to approach this problem? Hydrogen ...
A: First determine what units your answer will ultimately be in. This will help you figure out where ...
|
| Chem Question | 10/3/2007 |
Q: For a homework question I had to balance this equation, Al (s) + NO3- (aq) + OH- (aq) + H2O --> ...
A: Ok, I just did it out - so I know that it is possible. :) First, check to make sure that you have ...
|
| Chemistry Problem | 10/3/2007 |
Q: How do I solve this: How long would it take a radio wave with a frequency of 7.25 x 10^5 Hz to ...
A: The first thing you need to ask yourself is, 'What kind of wave is this?' Is it a sound wave? An ...
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| Chem Question | 10/2/2007 |
Q: For a homework question I had to balance this equation, Al (s) + NO3- (aq) + OH- (aq) + H2O --> ...
A: Balancing equations can be frustrating. Especially when you think you have it and then realize that ...
|
| Convert unite | 9/27/2007 |
Q: I have a blood test of Vitamin D that has been measured in pg/ml and ng/ml and want to convert ...
A: Conversions are some of the most messed up aspects of solving problems! And they are very ...
|
| Oxidation numbers | 9/19/2007 |
Q: Calculate the oxidation number of element combined with oxygen. ClO2 and N2O5.
A: I'm not going to do it for you, but the way to calculate oxidation states is pretty easy. Here are ...
|
| Magnisium oxide lab? | 9/14/2007 |
Q: I'm a senior in high school. while i was trying to find a website that can help me w/ my lab i ...
A: Well, this is a bit of a complex assignment! First of all - talk to your lab partner. I think that ...
|
| Analytical Chem | 9/14/2007 |
Q: I am given that the weight of copper in air is 25.296g and 22.388g in water(density of water = ...
A: Well, I'm not sure what the 'weight in water' is referring too, but I bet that it is helping you ...
|
| Separating Mixtures | 9/10/2007 |
Q: I need to separate sawdust, sand, iron filings, copper strands, and salt. Things that will count ...
A: Ok - first of all, you are right that the magnet will help you with the metal. But which one? Will ...
|
| measurement of concentration of solutions | 9/5/2007 |
Q: I'd like to know if there is any way or any equipment that can measure the concentration of ...
A: There are lots of ways to measure the concentration of chemcial species in solution. The most ...
|
| Chemistry Question | 9/4/2007 |
Q: I have been doing these two problems for over an hour. I dont have a problem solving the other 18 ...
A: Ok, I really can't answer these for you. What I can do is help you out and point you in the right ...
|
| Solute molality | 9/4/2007 |
Q: I am having a little trouble solving the following problem. Problem : A solute with a molar mass ...
A: I believe you may be making this problem more difficult than it actually is. You are right, ...
|
| Water=oxygen+hydrogen | 9/3/2007 |
Q: I have a problem with finding the volume of the gases. My question is:" How many cubic meters (m^3) ...
A: I'm not going to do the math for you, but I can help. This question requires you to know something ...
|
| Organic Dye (powder) | 8/31/2007 |
Q: my name is Adrian I'don't have idea what is organic dye, where I can find such dye. Anything can ...
A: Organic dyes are pigments that are made of molecules that contain carbon and hydrogen bonds. This ...
|
| why doesn't electrons get pulled into the nucleus? | 8/31/2007 |
Q: why doesn't electrons get pulled into the nucleus? Aren't they oppisite charges and will thus ...
A: This is a great question, and one that mystified scientists until the development of quantum theory. ...
|
| what gives natural mineral water it's minerals? | 8/30/2007 |
Q: We just went to Calistoga, California, famous for it's thermal mineral hot springs all over town. ...
A: Natural water gets its minerals from the rocks and soils it flows through. So if groundwater is ...
|
| Molecular Orbital | 8/29/2007 |
Q: I'd like to ask where are the electrons pair in the nonbonding molecular orbital since the orbital ...
A: Ok, I think I understand your question now. I'm going to start from the beginning, and hope that I ...
|
| biology | 8/26/2007 |
Q: what is the function of the amino acid ?
A: It is difficult to answer this question because amino acids are used for so many different things! ...
|
| saponification | 8/14/2007 |
Q: i wonder why is alcoholic KOH used instead of aqueous KOH for the saponification process?
A: It is a bit of a guess here, but it is quite possible that the products and/or reactants would not ...
|
| organic | 7/31/2007 |
Q: I have just started to study about organic chemistry I am at initial stages now
A: Ok, SN1 means that it is a unimolecular substitution reaction where the rate limiting step is the ...
|
| typing chemistry?... | 7/28/2007 |
Q: Sorry, I have a really boring question, but I can't find the answer to it anywhere. I don't know ...
A: Yes, there is a much easier way! Under 'Format' click 'Text' and in the box that pops up you should ...
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| Thanks | 7/26/2007 |
Q: Kristin, for the first time I used as 'Sir', you said you are miss, sorry for that. You said call ...
A: The Bohr theory about the structure of the atom was developed by Niels Bohr (hence the name) in ...
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| chemistry | 7/25/2007 |
Q: why does benzene resist addition reactions and prefer substitution reaction? ANSWER: Hi Salman, If ...
A: Ok, great! So, a long chain of carbon atoms with alternating double and single bonds is called a ...
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| chemistry | 7/25/2007 |
Q: why does benzene resist addition reactions and prefer substitution reaction?
A: If you think about what makes benzene so exceptionally stable you can easily understand this. ...
|
| request | 7/24/2007 |
Q: Sir, please teach me something about periodic table and characteristics of the group elements, what ...
A: First of all - I'm not a sir, I'm a miss! :) For some reason there has been confusion about this, ...
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| Organic | 7/22/2007 |
Q: Why is the number of resonance structures of an organic compound a measure of it's stability?
A: Resonance structures are imaginary, so it is more of a guage of its stability rather than an actual ...
|
| Ethanol concentration | 7/19/2007 |
Q: Can you please explain how to calculate the molar concentration of ethanol in a solution. If, for ...
A: Sure, I can explain how to calculate molar solutions. Since I don't know your chemistry background, ...
|
| intro organic chem | 7/16/2007 |
Q: We performed a lab today, and some of the results have boggled me. When silver nitrate (1%) in ...
A: Ok, you have made me dredge up all of my college orgo reactions! Which is a good review for me. ...
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| conformation preference of alkanes | 7/13/2007 |
Q: i was wondering why staggered conformation for alkanes is more favourable at lower temperatures. I ...
A: I haven't thought about this in awhile, and I don't have my books with me, so you might want to ...
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| sour milk | 7/12/2007 |
Q: My son is doing a project and we were wondering what is the chemical process that occurs when milk ...
A: Litmus paper will definitely detect lactic acid. It responds to any acid, and works by responding ...
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| Heating | 7/11/2007 |
Q: Does the heating of a substance automatically change its mass?
A: The answer to your question is no. Mass cannnot be gained or loss through heating. We can check ...
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| sour milk | 7/11/2007 |
Q: My son is doing a project and we were wondering what is the chemical process that occurs when milk ...
A: Milk sours due to bacterial fermentation. This is similar to fermentation that occurs to make ...
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| seperation of mixtures | 7/8/2007 |
Q: can u please tell me how can we seperate iodine and alcohol from the mixture of iodine and ethyl ...
A: Iodine and ethyl alcohol have very different properties and so will respond differently to different ...
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| general chemistry | 7/3/2007 |
Q: when nitric acid reacts with metals nitrogen dioxide is evolved if the acid is concentrated.why?
A: Nitric acid is an oxidant, and it oxidizes the metals with which it comes into contact. It forms ...
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| chemistry for living | 7/3/2007 |
Q: I'm wondering if you can name some great books on chemistry for non-chemists. There are two types ...
A: I can't remember if I've given an answer for this, but if so I apologize for my repetition. If not, ...
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| chemistry for living | 7/3/2007 |
Q: I'm wondering if you can name some great books on chemistry for non-chemists. There are two types ...
A: I'm having trouble of thinking of some off the top of my head. I know of some books that handle ...
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| oxidation states | 7/2/2007 |
Q: I have a question regarding oxidation states. Can elements have oxidation states in stable, ...
A: Yes, absolutely! This is the whole idea behind redox chemistry! Energy production and use is all ...
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| biodiesel | 6/30/2007 |
Q: Methanol and a strong base are used to convert animal and plant lipids to diesel fuel. The OH of ...
A: Short answer: yes. However, currently methanol is cheaper to use than ethanol. Biodiesel is ...
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| chemistry | 6/18/2007 |
Q: what dp the coefficients of a balanced chemical equation tell you
A: The coefficients of a balanced reaction are very important. They tell you the proportion (or ratio) ...
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| Group VIII Elements | 6/17/2007 |
Q: Having trouble with work... What is so special about the group VIII elements in terms of electron ...
A: I'm not entirely sure that I understand what you mean. Are you talking about which orbitals the ...
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| Aluminium pans | 6/16/2007 |
Q: Why does stewing rhubarb in aluminium pans leave pans clean and much shinier? Thanks!
A: I'm stuck at my computer at the moment, and can't get to my food science books to check this, but ...
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| Group VIII Elements | 6/16/2007 |
Q: Having trouble with work... What is so special about the group VIII elements in terms of electron ...
A: Group VIII elements are often referred to as noble gasses. They do certainly have special ...
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| Why do ripe fruits - especially when canned - smell bad? | 6/11/2007 |
Q: I notice that many fruits [excluding apples] emit foul odors when ripe. What chemicals are ...
A: The smell of rotten eggs is certainly due to a sulfur compound, in this case hydrogen sulfide. ...
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| Why do ripe fruits - especially when canned - smell bad? | 6/10/2007 |
Q: I notice that many fruits [excluding apples] emit foul odors when ripe. What chemicals are ...
A: I think I know what odor you are talking about, though I'm not entirely sure. I don't think you ...
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| chemisty | 5/31/2007 |
Q: I have to determine the percent by mass of BaCl2 and NaCl in a sample of sand. I am allowed to use ...
A: This sounds a bit like a homework question, but I appreciate the fact that you ask 'how' you can ...
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| kiton | 5/26/2007 |
Q: what is the meaning of acids
A: In order to understand what an acid is, some basic chemistry is required. Don't be scared away, it ...
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| question | 5/25/2007 |
Q: I'm researching a chemistry project for my biochemistry course, and my topic has to do with lead ...
A: I'm not an inorganic chemist - so this really isn't my area of expertise. However, one of the most ...
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| similarities and differences | 5/23/2007 |
Q: what are the similarities and differences between starch, glycogen and cellulose?
A: The similarities are fairly easy - all three of these molecules are carbohydrates, that means that ...
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| H2O | 5/23/2007 |
Q: O.k. Im making a flip book of H2 being poured into a container with O2 and producing H20. However ...
A: That sounds really neat. I'm trying to think of anything else that you might want to show - and ...
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