Chemistry - November 2007

2007-11-22 02:47:55 · 2 answers · asked by Anonymous

2007-11-22 02:26:50 · 3 answers · asked by Anonymous

I get it that it's acetic acid, and that is called vinegar. But I just want to know, if I only had the chemical formula, and no where else to look, how would I name that? For example, I have C6H12O6. Without the use of Google, how do I find out what to call this? Thanks!

2007-11-22 02:17:32 · 9 answers · asked by Jennifer C 1

i cant answer this problem. help me! and also give solutions so i can understand... :

a given mass of He has a volume of 200mL. to what absolute temperature must it be treated to have a volume of 0.8L at 1.2 atm.?

(its related to gas laws like boyle's, charles ,gay-lussacs, combined gas law. ang please remember to use KELVIN because its an abs. temp. ok? {Kelvin=Celsius+273}. TY!)

2007-11-22 02:15:04 · 2 answers · asked by Anonymous

In cyclic voltammetry, a reversible process should have Ic/Ia = 1.
But when its not 1, sometimes it is described as quasi-reversible. When is the process considered reversible / quasi-reversible /Irreversible?

2007-11-22 02:13:53 · 3 answers · asked by Peter E 2

I have to do a report and presentation on "The properties and usage of selected transition elements". I selected iron, cobalt and nickel because somewhere I read that they where special. I wanted to start off by describing some sort of technology that uses iron, cobalt and nickel and then describe the role of each and then describe the properties that make them so usefull. The problem is, I don't know of any such technology, If anyone knows of one or has any general tips or suggestions for me I would appreciate it.

BTW: the presentation is on monday so I don't have time for anything overly elaborate.

2007-11-22 02:07:11 · 2 answers · asked by Anonymous

but did not get the green color that I was expecting.
The chem supply store where I bought this is not very popular so this chemical probably sat on the shelf for a few years.
The chemical is a bit clumpy.
How else can I test this chemical?

BaCl2 2H2O

2007-11-22 02:06:42 · 4 answers · asked by mixmaster2 3

The question is on my blog
aabhassrivastava.blogspot.com

2007-11-22 01:57:45 · 1 answers · asked by Aabhas S 2

I need some examples explained to me to explain why hydrogen bonding is important in biolgical systems please?

2007-11-22 01:32:52 · 1 answers · asked by Info team 2

full of water in a frozen state wiegh?? this is important

2007-11-22 01:32:22 · 4 answers · asked by Anonymous

i mostly heard that HBr is higher than HCl. in most chemistry books i had seen the same thing. i understand that it is not true. HCl should have higher boiling point than that of HBr?

2007-11-22 01:23:52 · 3 answers · asked by FAJI M 1

2007-11-22 01:10:33 · 1 answers · asked by roxie 1

2007-11-22 00:51:33 · 3 answers · asked by manna eater 3

2007-11-22 00:46:50 · 4 answers · asked by Anonymous

2007-11-22 00:44:40 · 3 answers · asked by 2011 1

2007-11-22 00:29:26 · 2 answers · asked by emilieeee 2

I need to know why nitric acids structure is so important in terms of why its stronger

2007-11-22 00:16:26 · 3 answers · asked by Info team 2

2007-11-22 00:14:37 · 1 answers · asked by jessica alba fan 1

This is for the purpose of repelling harmful energy in the microwave frequencies. Diamond? Graphite?

2007-11-21 23:59:45 · 3 answers · asked by illunatic 2

i have been off school all week with illness and my chemistry teacher has set this and says that it is completely research based, but i cant find anywhere that will help! the question is 'copper has two oxides, Cu2O and CuO.
copper carbonate, CuCO3 decomposes on heating to form one of these oxides and an equation can be written for each possible reaction:
equaton 1: 2CuCO3(s) ---> Cu2O(s) +2CO2(g) + 1/2O2(g)
2: CuC03(s) ---> CuO(s) + CO2(g)
using ideas learnt about mole, plan and desgn an experiment to measure a volume of gas that will prove with of the two equations is correct' and i have to include equipment needed, quantities of any reagents used, any special sets of conditions required for a particular procedure, and a detailed method which provides full instructions and any precautions.

my first thought was to put the copper carbonate in a conical flask heat it untill gas is given off then displace water in a conical flask to collect it? does that sound right?

2007-11-21 23:51:38 · 4 answers · asked by topher 2

2007-11-21 23:39:43 · 2 answers · asked by jessica alba fan 1

I know it's mostly used in battery applications as a solid, but since it's a downshift on the periodic table compoundwise, ie, Li2 is right under H2 and S is right under O, it seems like the fluid should be waterlike.

Or do compounds not work that way?

2007-11-21 23:23:35 · 1 answers · asked by John F 3

2007-11-21 22:41:27 · 1 answers · asked by Margeaux E 1

We say some elements more reactive than other. Is the reactivity of an element is independent of the reagent or substant it is interacting? I reasonably suppose it is not. So the question arises is there any standard substance which is used to test the reactivity of a given element or species (ions, molecules etc) or any arbitrarily attributed condition .. Or simply the term reativity is not precise (a rough one...)?

2007-11-21 22:31:30 · 2 answers · asked by Anonymous

The molecular weight of hemoglobin is 65,000 g/ml. Hemoglobin contains 0.35% Fe by mass. How many iron atoms are in hemoglobin?

2007-11-21 22:00:26 · 1 answers · asked by beatrix 1

Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?


Alexander, who weighs 201 lbs., decides to climb Mt. Krumpett, which is 5220 m high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.

I got a really high number around...2484042... and thats not even logical.

I first calculated the energy to climb the mountain which i found to be 4.67 *10^6 Joules.

I then began to calculate the energy in each nutrition bar...450 calories are in 1 nutrition bar. I then used a conversion factor to convert calories to Calorie... however its not converting right... I believe there are 1000calories in 1 Calorie... I then used another conversion factor 4.184 J in 1 Calorie.. im lost!

2007-11-21 21:24:25 · 2 answers · asked by hobiesailor07 1

I need to write a balanced chemical equation for the reaction used to calculate the standard enthalpy formation of CaCO_3.

Thanks in advance.

2007-11-21 21:13:28 · 1 answers · asked by hobiesailor07 1

needs some help with this one... i keep getting 795.1... it doesnt list if the molecules are liquid, solid, or gas so im not sure on all the enthalpy values. I could really use someones help. Thanks in advance.

2007-11-21 21:09:30 · 1 answers · asked by hobiesailor07 1

2007-11-21 21:08:34 · 5 answers · asked by Anonymous

CH3OH --> CO + 2H2.

For a given sample of CH3OH, the enthalpy change on reaction is 17.5kJ.

2007-11-21 21:01:45 · 1 answers · asked by hobiesailor07 1