| Subject | Date Asked | Expert |
|
| CHEMISTRY (HIGH SCHOOL STANDARD) | 11/15/2009 | Chad Welch |
Q: Please can you tell me whether having lots of unsaturated (double) bonds affects a substance's ...
A: Julie, I'm not sure what you mean by a substance's thickness. Do you mean the thickness of the ...
|
| chemistry | 11/7/2009 | Philip Carlson Ph.D. (Cand.) |
Q: if the half-life of a radioactive material is 8 years how many years will it take for one half of ...
A: the half life is the amount of time it takes for half of the material to be left. So if I had a ...
|
| Nitrogen gasoline | 11/5/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I look at the Shell nitrogen enriched gasoline, and wonder how nitrogen, which is inert, can clean ...
A: Well, without specific information about what process they have going on I can tell you a few things ...
|
| Organic Chemistry...well, sort of. PLEASE HELP!!! | 11/3/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I need help with my science project! I have my ideas, and most of my procedure, but I am having a ...
A: This will be very difficult. Generally when A stain is "removed" all that happens is some bonds are ...
|
| Chemistry | 11/2/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I am trying to help my daughter with this problem, but cannot remember what to do. I can convert ...
A: So in order to answer this question we first need to know how many atoms in 59.0g of F. We can take ...
|
| Electron ray vs Magnets | 10/20/2009 | Philip Carlson Ph.D. (Cand.) |
Q: How can a magnet repel or attract an electron ray? If the electron ray (i.e. cathode ray tube) has ...
A: The laws of electro-magnetism tell us that both concepts (electric charges and magnetic fields) are ...
|
| Chemistry | 10/10/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I am attempting to help my son - we are stick with thisWhat molarity of HCI would have a pH value of ...
A: This question kind of needs to be worked in reverse (if you like to think of it that way). We need ...
|
| chem question | 10/4/2009 | Chad Welch |
Q: Hey I've been stuck on this question for over 2 hours from an old test of one of my professors. ...
A: Given the information you have listed here, the correct answer is 7.90g. However, I believe there is ...
|
| limiting reactant & gasses | 10/4/2009 | Philip Carlson Ph.D. (Cand.) |
Q: Hey I've been stuck on this question for over 2 hours from an old test of one of my professors. ...
A: Hey Roshanb, I sat down and worked it through and arrived at 11.52g as the answer. Let me walk you ...
|
| Plastic Drinking Glasses | 9/30/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I purchased blue plastic drinking glasses. The information on the glasses said not to pour alcohol ...
A: Without knowing specifically what type of plastic is glasses are made of, I would say that the ...
|
| Kidney Stones | 9/29/2009 | Dr. Henry Boyter, Jr. |
Q: -What is the chemical composition of kidney stones? -Can there be any chemical used for breaking ...
A: Kidney stones come in several types. http://www.chemistrydaily.com/chemistry/Kidney_Stone There ...
|
| States of matter | 9/23/2009 | Dalton |
Q: Can a metal such as iron turn into a gas at a high enough temperature? What would it's physical ...
A: yes, if a solid metal is heated to it's melting point it will melt, and if heating is continued to a ...
|
| General Chemistry | 9/23/2009 | Philip Carlson Ph.D. (Cand.) |
Q: In a certain compound of copper and oxygen, Cu(x)O(x), we find that a sample weighing .6349g ...
A: If your sample weighed 0.634g and it was only Cu(x)O(x) then you can just take 0.6349g-0.5072g and ...
|
| Determining % Hydrolysis. | 9/22/2009 | Dalton |
Q: I am having trouble how to figure out % hydrolysis. Is there a general formula? I figured that I ...
A: First, to determine the percent hydrolysis you have to know what Hydrolysis means and how it is ...
|
| chemistry | 9/19/2009 | Dr. Henry Boyter, Jr. |
Q: suppose i wanted to collect and find the mass of gas produced in a chemical reaction. how could i ...
A: Here is the best method. With the volume of water displaced, use PV=nRT to get moles and then ...
|
| Chemistry | 9/12/2009 | Kimberly Noble |
Q: A student weighed 14.1 grams of lead shot and placed it in a graduated cylinder containing 10.2 mL ...
A: Density is mass/volume, so to calculate it you need to know those two things, mass and volume. ...
|
| Significant Figures | 9/12/2009 | Kimberly Noble |
Q: If X = 15.4 ± 0.1 and Y = 126.0 ± 0.2, calculate the following, include calculation of error i) X+Y ...
A: You just need to know the number of significant digits in X (3) and Y (4), then follow the rules ...
|
| chemistry | 9/10/2009 | Kimberly Noble |
Q: Calculate the energy in joules lost when 15.0g of ethanol, cools from 60.5 degrees Celsius to minus ...
A: The equation you're looking for is: q = mc(Tf - Ti) Where q is the energy lost/gained, m is the ...
|
| chemistry | 9/8/2009 | Kimberly Noble |
Q: I am stuck on my chemistry homework, with doing pennfoster online It's hard not having a personel ...
A: MASS NUMBER/ISOTOPES: The number of protons (the "atomic number") in the nucleus is what defines an ...
|
| Molarity | 9/7/2009 | Dr. Henry Boyter, Jr. |
Q: How do i determine molarity using ppm?
A: There are two methods: 1. At low concentration water solutions (<1000 ppm), ppm is equal to mg/L. ...
|
| Atomic Half-Life | 9/6/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I not a student so I am sure this is an elementary question, but I am curious about the term ...
A: The rate of decay is best described as an exponential decay. An exponential is not linear. Hence the ...
|
| cigarette smoke. | 9/3/2009 | Kimberly Noble |
Q: how does cigarette smoke affect the growth of plants [seedlings]. :tnx!
A: This sounds like an essay question to me, so I will try to point you in the right direction. You ...
|
| Methane | 8/29/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I have a very simple two part question for you. I'm fermenting my own cider at home, and during the ...
A: The density of methane is less than that of air. That means it should be lighter. Hence it should go ...
|
| analytical techniques | 8/24/2009 | Dr. Henry Boyter, Jr. |
Q: is there any reason you can think of as to why HPLC-MS might be more appropriate for testing a ...
A: If you have a preparation that is contaminated with metals, you may want to know which component is ...
|
| chemistry | 8/22/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I am doing pennfoster online high schooling, chemistry is not my strong point, and really do need ...
A: 6. A would be the correct answer. While this question is very vague I believe the best answer is ...
|
| Buffer titration and effect of dissolved NaCl on | 8/18/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I actually have 2 questions if that's ok? If you don't want to answer both, then I'd rather you ...
A: what an involved question. Thank you for taking the time to give me details. I will try to answer ...
|
| Bond lengths | 8/15/2009 | Dr. Henry Boyter, Jr. |
Q: Henry, This is not a homework question. I already know the answer to it but don't understand the ...
A: One way to think about it is this. Look at each one not as a C-Cl bond but as a RC-Cl bond, where R ...
|
| Organic Chemistry | 8/1/2009 | Kristin |
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 ...
|
| coulmn chromatography | 7/29/2009 | Philip Carlson Ph.D. (Cand.) |
Q: What does a UV peak show in column chromatography?"
A: Without any more specifics than this, I would say it is just like any other UV peak. I operated a ...
|
| Stoichiometry | 7/28/2009 | Kristin |
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 ...
|
| calcium carbide reaction | 7/27/2009 | Philip Carlson Ph.D. (Cand.) |
Q: Could you provide the exact by products/results of mixing calcium carbide with water? I am on a ...
A: CaC2 + 2 H2O → C2H2 + Ca(OH)2 When mixed with water it produces acetylene gas which is VERY ...
|
| Energies in Chemistry | 7/27/2009 | Kristin |
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 ...
|
| supplements nutrition | 7/25/2009 | Kristin |
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. ...
|
| LeChatelier's principle and thermodynamics | 7/19/2009 | Philip Carlson Ph.D. (Cand.) |
Q: If the forward reaction of a system in equilibrium is endothermic, what will increasing the ...
A: This question is related directly to LeChatelier's (pronounced Li Sha-tell-yea) principle. Basically ...
|
| Unexplained Garlic Reaction | 7/18/2009 | Philip Carlson Ph.D. (Cand.) |
Q: Our family has a remedy we have been doing for awhile. We take whole garlic and pour apple cider ...
A: An article in the Journal of Agricultural and Food Chemistry, Volume 54, Issue 3 (February 08, ...
|
| Percent by Mass - Chemistry Word Problem | 7/17/2009 | Philip Carlson Ph.D. (Cand.) |
Q: Oxygen makes up 46.7 % by mass of earth crust. How many grams of oxygen are present if a sample of ...
A: If oxygen is 46.7% by mass then we know that no matter how much earth we have 46.7% of it must be ...
|
| solution percent problem | 7/12/2009 | Dr. Henry Boyter, Jr. |
Q: Dr. Boyer, I have tried multiple times to figure out this problem, but I still cannot come up with ...
A: Let x be the volume of 18% needed The amount of sulfuric acid in each is x(18) and 360(10) ...
|
| Radicals and Ions | 7/12/2009 | Philip Carlson Ph.D. (Cand.) |
Q: what is difference between radical and ion?what is charge on free radical? ANSWER: Ions can come in ...
A: Well, essentially you just take what a radical is and then take what an ion is and combine them. If ...
|
| Calcium chloride from water softener | 7/12/2009 | Dr. Henry Boyter, Jr. |
Q: I understand that calcium chloride is discharged from a ion exchange water softener. Instead of ...
A: It is possible, but the problem is getting it down to a useable level. If my calculation is ...
|
| Enthalpy change of neutralization | 7/11/2009 | Philip Carlson Ph.D. (Cand.) |
Q: I have done an experiment to determine the enthalpy change of neutralization for NaOH and HCl. ...
A: You are correct. They Styrofoam cup would cause heat loss. So, how do you explain the heat "gain" ...
|
