| Subject | Date Asked |
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| Salt water test | 11/25/2009 |
Q: I have a question about a salt water corrosion test. When I was performing this test I used a ...
A: Allen, You are correct. The cheaper salt will have more impurities. I did corrosion testing for a ...
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| CHEMISTRY (HIGH SCHOOL STANDARD) | 11/15/2009 |
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 ...
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| chem question | 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: Given the information you have listed here, the correct answer is 7.90g. However, I believe there is ...
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| Chemistry trivia | 4/20/2009 |
Q: My son has a science teacher that does something every couple of weeks for extra credit, and also ...
A: Patty, Those are geographic coordinates. If you have a program like Google Earth (it is a free ...
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| calories | 4/20/2009 |
Q: Can calories be diluted? For example: If you pour a can of soda into a half gallon of water and ...
A: Carmela, You are correct. Consuming a can of soda will have the same number of calories as dumping ...
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| chemistry | 4/18/2009 |
Q: why a spoon full of full of sugar dissolves more quickly than a sugar cube?
A: This is because of the surface area of the sugar cube versus the spoon full of sugar. The only ...
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| hydrogen flouride | 4/16/2009 |
Q: why only hf reacts and attacks silicon dioxide and why silicon dioxide is resistant towards all ...
A: SEEP, The other halogens are less electronegative so it is not favorable for the SiO2 to undergo a ...
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| hydrogen flouride | 4/15/2009 |
Q: why only hf reacts and attacks silicon dioxide and why silicon dioxide is resistant towards all ...
A: SEEP, HF undergoes a chemical reaction with the SiO2 to form silicon hexafluoride. Most acids ...
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| flammable elements | 2/20/2009 |
Q: (This is for a novel I'm writing) Of Hydrogen, Lithium, Beryllium, Boron, Carbon, Oxygen, Fluorine, ...
A: Michael, Of those elements, hydrogen is the most flammable. If you are familiar with the Hindenberg ...
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| water and evaporation | 11/10/2008 |
Q: i was wondering how and why water evaporates when it is not exposed to its boiling point. ex. If i ...
A: Tyler, That is a good question. To begin to understand it, we need to think about the water on a ...
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| moles | 9/16/2008 |
Q: suppose I have a 100g sample of a compound. How would I go about in finding how many moles are in ...
A: Naomi, You are almost correct. You do need to find the molar mass. The units of the molar mass are ...
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| Planet chemical used in medicine? | 9/15/2008 |
Q: I wanted to know if you knew of any chemical from a plant that is used medicinally. I have to write ...
A: Abigail, Thanks for the question. Yes there are numerous medicines in use that are derived from ...
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| Titration | 8/19/2008 |
Q: I am studying for the MCAT and I am in fact doing a practice problem but I am not asking you to ...
A: Jessica, This is a good question. You have it set up correctly, except that I think a plus sign is ...
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| Mass of sugar dissolved in water | 8/19/2008 |
Q: oldie a bit confused..Of you have 2 teaspoons of sugar and they weigh 20 grams, and a glass of water ...
A: You are correct; the mass of the sugar water will be 120 g. What does change is the density of the ...
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| Ions | 4/7/2008 |
Q: As a general rule is it true that the further away an electron is from the nucleus the less energy ...
A: Daniel, Before I answer let me make sure I am understanding your question. When you refer to first, ...
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| Ions | 4/6/2008 |
Q: As a general rule is it true that the further away an electron is from the nucleus the less energy ...
A: Daniel, As a general rule that is correct. This is known as the ionization potential (see ...
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| Avrogadro's Number | 4/2/2008 |
Q: How did Avogadro Find this Number can duplicate his experiment, how?
A: Christopher, Avogadro did not determine the number that is attributed to his name. He is best known ...
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| buffer solution | 2/26/2008 |
Q: If a buffer solution contains an acid as one component and a base as the other, can those two ...
A: Ann, Your assumption is correct. A buffer is made of a weak acid and its conjugate base or a weak ...
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| chemistry | 2/25/2008 |
Q: i need to know how to determine the molecular mass of C2H5OH?
A: Sade, The molecular mass is just the sum of the individual masses of the elements. On the periodic ...
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| calcium flouride | 2/9/2008 |
Q: I am wondering if you can tell me which is the correct formula for calcium fluoride. CaF2 or CaF ...
A: Vince, That is partially correct. The larger the molecules become, the less it can be thought of as ...
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| calcium flouride | 2/9/2008 |
Q: I am wondering if you can tell me which is the correct formula for calcium fluoride. CaF2 or CaF ...
A: Vince, Calcium fluoride is CaF2. In its elemental form fluorine is F2, so the chemical formula ...
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| gas volumes | 2/8/2008 |
Q: I need to design an experiment which will allow me to measure the volume of a gas. I am trying to ...
A: Loma, STP stands for standard temperature and pressure, which is generally used to refer to 0 ...
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| phas shifts, opposite of sublimation | 2/7/2008 |
Q: solid to liquid....melting liquid to solid....freezing liquid to gas.....evaporation gas to ...
A: Feiv, Yes, the transformation of a gas to a solid (without the intermediate liquid phase) does ...
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| gas volumes | 2/7/2008 |
Q: I need to design an experiment which will allow me to measure the volume of a gas. I am trying to ...
A: Loma, The simple answer is that if the first equation were correct, the volume of gas at STP would ...
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| Salts present in natural water | 1/6/2008 |
Q: What are the salts that could be found in natural mineral water? Yours Anna
A: Anna, Mineral water is a very broad term. There are thousands of commercially available brands of ...
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| limewater | 11/24/2007 |
Q: and does it have a set concentration if it's not diluted etc thanks
A: Lorna, Yes, lime water is alkaline. It is a saturated solution of calcium hydroxide in water. ...
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| atoms | 11/22/2007 |
Q: I have a few questions that have been floating around my head while sitting in my first year chem ...
A: Andrea, Good questions. On a molecular level, when an object is broken, the bonds that were ...
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| molality and molarity | 11/20/2007 |
Q: Can you explain the difference between molality and molarity? And under which circumstances should ...
A: Meg, Molarity is defined as grams of solute per liter of solution. It is determined by weighing the ...
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| Periodic Table | 10/27/2007 |
Q: Why are the Lanthanides and Actinides separated from the rest of the table?
A: Joo, The only reason is to make it easier to print and display the periodic table. If you go to ...
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| Need some help understanding concept/process by which to deduce answers... | 10/4/2007 |
Q: MyHow do I find a)the # of protonc b)the # of electrons, and c)the # of neutrons when given info. ...
A: Confused, An element will always have the same number of protons. This is given by the element ...
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| why warm objects weigh less | 9/25/2007 |
Q: I was wondering why warm objects weigh less than cool objects. Thanks.
A: Jessica, This is a good distinction between mass and weight. The mass of the object doesn't vary, ...
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| Chem Question | 9/23/2007 |
Q: Im taking chemistry in college. I dont know how I would go about solving this problem. Thanks. ...
A: Qadus, I don't generally answer homework questions on this forum, but I'll give you the steps, if ...
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| chemistry | 9/22/2007 |
Q: I'm unclear on the diffrence between the number of electrons in the outer shell and the valence ...
A: Debbie, In many cases the valence number does equal the number of electrons in the outer shell. In ...
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| acetic acid | 9/21/2007 |
Q: i was just wondering if you can explain one simple thing to me... In the structural formula for ...
A: Danny, CH3COOH is shorthand for acetic acid, but the notation doesn't show bonds. A better picture ...
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| Chemistry | 9/18/2007 |
Q: How do i tell the difference between what is a heterogeneous mixture and a homogeneous mixture? like ...
A: Shelby, A heterogeneous mixture is composed of more than one distinct component. Concrete is made ...
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| iso | 9/6/2007 |
Q: In chemistry, what does iso mean?
A: Matt, ISO refers to the International Organization for Standardization. I'm not sure why the ...
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| lab | 9/3/2007 |
Q: How am I supposed to know if the object is cooled down yet? I think they said I"ll be holding a test ...
A: Jeff, You will probably be using a test tube clamp like the ones shown at: ...
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| atom vs. element | 8/31/2007 |
Q: Is atom synonymous with element? My textbooks subtly tries to imply they're different, but I don't ...
A: Matt, The difference is subtle and has to do with quantity more than anything. As I'm sure you ...
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| engines | 8/25/2007 |
Q: how does water damage parts of engines? thankyou
A: Victor, There are primarily two reasons that water is bad for engines. First, most engines are made ...
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| chemistry | 8/24/2007 |
Q: does the pressure in a filled propane tank decrease when the valve is opened?
A: Trey, Yes and No. If you have a guage on the tank that shows the pressure inside the tank, then you ...
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| passive solar heating | 1/22/2007 |
Q: I'm trying to heat many acres of plastic tunnels for Agriculture. The farm agent said to put water ...
A: Sandra, Adding calcium chloride (CaCl2) will affect the heat transfer rate of water. The more CaCl2 ...
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| Mercaptoethanol | 1/17/2007 |
Q: This may be a trivial question, but what is the chemical structure of mercaptoethanol and what does ...
A: Jim, Mercapto (or mercaptan) is another name for a thiol or an -SH functional group. So ...
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| when magnesium oxidizes | 1/15/2007 |
Q: i am a sophomore in high school and i recently did a lab in chemistry class where i oxidized ...
A: Stephanie, I like the way you think. You started with a metal and ended with a powder. On first ...
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| Chemistry for Science Fair | 1/15/2007 |
Q: What is the name of the bacteria that is found in old milk?What makes the color change in when you ...
A: Nancy, Milk will contain many different types of bacteria. Some estimates give dozens of varieties ...
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| Chemistry for Science Fair | 1/14/2007 |
Q: What makes the color change in when you add Bromthymol blue to fresh milk, five day old milk, 10 day ...
A: Nancy, Bromothymol blue is a common pH, or acid, indicator. Most pH indicators work by changing ...
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| Weight of Water | 8/22/2006 |
Q: How much does water weigh? For example.... how do you figure out how many pounds are in 12 FLUID ...
A: Amanda, 1 mililiter of water equals 1 gram. So to figure out how much 12 Fl. Oz. weighs, we have to ...
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