Chemistry - May 2007

can u plz answer this i really need it for a project due tomorrow! plz plz plz help!

2007-05-22 11:31:48 · 3 answers · asked by Anonymous

2007-05-22 11:28:03 · 6 answers · asked by y_veasy 1

the end of the ? is 201 ml "of this soluition".
It was over 100 characters so it couldnt fit but yeah please help =]

2007-05-22 11:27:47 · 2 answers · asked by Anonymous

2007-05-22 11:04:30 · 4 answers · asked by Anonymous

The Breakdown of hydrogen peroxide into water and oxygen is catalyzed by the iodide ion. The mech. proposed for this reaction is as follows:

H2O2 + I- ----->H2O +OI -1 (Slow)
H2o2 + OI-1------> H2O + O2 + I-

What experiments could I run to determine the oder of the iodine clock reaction in terms of H2SO3?

And why is the iodine clock reaction so slow? Is this related to the rate law/mechanism for the iodine clock reaction? Colision theory? How's this all tie in? Thanks in advance.

2007-05-22 10:56:22 · 2 answers · asked by Anonymous

2007-05-22 10:51:28 · 2 answers · asked by nadja b 1

Calculate the pH of a solution that is 1.50M C5H5N and 2.50 M C5H5NHCl.

This one is killing me! Please help. Thanks in advance!

2007-05-22 10:49:47 · 2 answers · asked by Anonymous

Calculate the volume occupied at STP by 2.56 mol of oxygen

Find the molecular mass of a gas if 19.08 grams occupy 12.62 dm3 at 92.5 kPA and 52.6 C

2007-05-22 10:48:48 · 2 answers · asked by Anonymous

What is a common polymer prepared by the process of addition polymerization and what is the equation showing its formation?

2007-05-22 10:40:09 · 2 answers · asked by esalina14 2

2007-05-22 10:22:44 · 2 answers · asked by Ade 1

1. The harbour process is used industrially to synthesize ammonia from nitrogen and hydrogen. The thermochemical equation for this is : N2(g) +3H2(g) <-> 2 NH3(g) + 92kJ

a) Use the le chateliers principle to explain why the following changes result in an increase in the yeild of ammonia
i)a decrease in temperature
ii)an increase in pressure

B) even though a reduction in temperature favours the formation of ammonia , describe why, industrially the temperatre of the reactuib chamber is increased.

2. Consider the folliowing reaction: N2(g) + 2O(g)<=> 2NO2 (g)
[n2]= 8.0 mol/l [o2]=2.0 mol/l [NO2]=4.0 mol/l
**Determine the equilibrium constant.
3. Write the equilibrium expressions (K) for each of the following reactions:
i) H2(g)+F2(g) <=> 2NF(g)
ii)4NO(g) +3O2(g)<=> 2N2O5(g)
iii)BaCO3(s)<=>BaO(s)+CO2(g)

The equilibrium constants for three differnet reactionsare
i) Ke= 1.5x10^12
ii)Ke= 0.15
iii)ke=4.3x10^.15
In which reactionis a)The ration the bigest b)smallest

2007-05-22 10:03:49 · 1 answers · asked by Anonymous

Cu^2+

NH3

I^1-

BCl3

2007-05-22 10:02:44 · 2 answers · asked by rumblemustang 1

2007-05-22 09:59:26 · 1 answers · asked by cindy c 1

It's seems pretty complicated on Wikipedia and I would just like a basic understanding of what they are and how they benefit fitness, etc.

2007-05-22 09:45:10 · 9 answers · asked by Yea Yea 4

If you have a hydrate, such as CuSO4∙5H2O, and you dissolve it in water to create an aqueous solution, where does the 5H2O go? Does it stay in the formula, or dissolve into the water as well to become 5H2O (l) and CuSO4(aq)?

2007-05-22 09:18:31 · 4 answers · asked by Chris 1

Can you predict before hand what a chemical reaction will do? I mean, suppose you put two different liquids together and mix them up at some temperature and pressure... Can you guess the outcome? How do you have an intuitive feel for a substance by simply knowing it's chemical composition? From the knowledge of H20, can you predict the properties of water? Or is most of this knowledge build up over time and most of it empirical with an explanation only occuring AFTER you know the properties of the substance?

2007-05-22 08:54:12 · 3 answers · asked by Plazzmoidi F. McStinkleshlonger 3

Using a beaker, test tube, and a hot plate. letting the liquid boil and then cool until the bubbles stop. once no more bubbles are observed, the thermometer is read.
Why is it difficult for liquids that have a boiling point over 100 degrees celcius.

2007-05-22 08:29:14 · 2 answers · asked by Franz 1

medicinal chemistry, pharmacology

2007-05-22 08:25:51 · 1 answers · asked by nbfromkc 1

[PtCl4]^-2

CuCl2

[Fe(CN)6]^-3

Fe2O3

[Cu(en)2]^-2

2007-05-22 08:21:19 · 1 answers · asked by rumblemustang 1

.... you're part of the precipitate?

2007-05-22 07:39:19 · 9 answers · asked by Anonymous

2007-05-22 07:29:21 · 12 answers · asked by evenstar03 2

an engin does 1500J of useful wor with each 5000J of energy supplied to it.
what is its efficiency? what happens to the rest of the energy supplied?

2007-05-22 07:22:29 · 4 answers · asked by jessica 1

2007-05-22 06:39:41 · 4 answers · asked by camphaign 1

colourful/3D atomic structure with some details about the medicines(or possibly some sites where the details r given).

2007-05-22 06:33:51 · 1 answers · asked by Anonymous

Just curious after watching Nova: Hitler's Sunken Secret on PBS.

2007-05-22 06:09:17 · 8 answers · asked by Pankration 3

what is the most common chemical method for removing H3O+ ions in aqueous solutions? Plz show a net ionic equation which describes this method

2007-05-22 05:58:59 · 5 answers · asked by Anonymous

2007-05-22 05:52:14 · 2 answers · asked by Anonymous

I know that when a compound is in brackets it means that you are looking at the concentration of that compound, but what type of concentration is it talking about (molarity, molality, or mole fraction)? Does it depend on the context in which it's used?

2007-05-22 05:51:20 · 5 answers · asked by Anonymous

How do you find out the central atoms hybridization of octene,or any (organic with a single, double or triple bond) compounds central atoms hybridization?

2007-05-22 05:50:01 · 1 answers · asked by Adam S 2

Balancing Equtaions?
Determine the product and then balance the following equations. Remember to use 2 for a subscript if you have a diatomic element by itslf.


CaI2 + Cr2O=???

2007-05-22 05:48:19 · 2 answers · asked by sanober h 4