| Subject | Date Asked |
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| chemistry | 11/7/2009 |
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 ...
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| Nitrogen gasoline | 11/5/2009 |
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 ...
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| Organic Chemistry...well, sort of. PLEASE HELP!!! | 11/3/2009 |
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 ...
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| Chemistry | 11/2/2009 |
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 ...
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| Electron ray vs Magnets | 10/20/2009 |
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 ...
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| Chemistry | 10/10/2009 |
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 ...
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| limiting reactant & gasses | 10/4/2009 |
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 ...
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| Plastic Drinking Glasses | 9/30/2009 |
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 ...
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| General Chemistry | 9/23/2009 |
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 ...
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| Atomic Half-Life | 9/6/2009 |
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 ...
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| Methane | 8/29/2009 |
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 ...
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| chemistry | 8/22/2009 |
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 ...
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| Buffer titration and effect of dissolved NaCl on | 8/18/2009 |
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 ...
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| coulmn chromatography | 7/29/2009 |
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 ...
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| calcium carbide reaction | 7/27/2009 |
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 ...
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| LeChatelier's principle and thermodynamics | 7/19/2009 |
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 ...
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| Unexplained Garlic Reaction | 7/18/2009 |
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, ...
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| Percent by Mass - Chemistry Word Problem | 7/17/2009 |
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 ...
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| Radicals and Ions | 7/12/2009 |
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 ...
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| Enthalpy change of neutralization | 7/11/2009 |
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" ...
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| The Honey Dilema??? | 7/10/2009 |
Q: I was taking some honey from a jar of set Honey and the strangest question entered my mind! If you ...
A: After, hearing your interesting question I immediately thought of this video: ...
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| Radicals and Ions | 7/8/2009 |
Q: what is difference between radical and ion?what is charge on free radical?
A: Ions can come in a few different flavors. Namely, cations and anions. Cations are compounds with a ...
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| Chemistry Quiz | 7/7/2009 |
Q: Who first suggested that matter was made up of tiny individual particles? A. Dalton B. Democritus ...
A: 1) B. Democritus 2) Sort of a trick question but I feel FALSE is most correct 3) True 4) D. ...
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| Chemicals | 7/4/2009 |
Q: Carlson, my question is: Can one store a small HDPE bottle of HF acid in the car trunk? Will it leak ...
A: This is a really scary question. I cannot imagine EVER wanting to store HF in a car trunk no matter ...
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| Enthalpy change of neutralization | 7/1/2009 |
Q: I am doing an experiment on enthalpy change of neutralization. Why is strong acid/strong base ...
A: There are a number of factors to consider in this type of situation. First, I will assume that the ...
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| ionizing and non-ionizing solute in water | 6/30/2009 |
Q: why is it when salt,NaCl (ionizing solute) is dissolved in water, it lowers the temperature of ...
A: Technically you would want to be able to compare the number of molecules per heat change and you ...
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| ionizing and non-ionizing solute in water | 6/27/2009 |
Q: why is it when salt,NaCl (ionizing solute) is dissolved in water, it lowers the temperature of ...
A: This is an interesting question which some analysis can answer. Essentially you are asking about the ...
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| oxidation states | 6/24/2009 |
Q: Assign oxidation numbers to the underlined element in each of the following formulas: a) KClO4 b) ...
A: I'm not sure which is the "underlined element" but here is what I am thinking. a) KClO4 Oxygen is ...
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