Chemistry - March 2007

2007-03-16 11:02:59 · 2 answers · asked by jesus c 1

2007-03-16 11:01:58 · 4 answers · asked by Alan 1

I also need to know the molecular structure of vinegar
please help
thank you diana

2007-03-16 10:44:02 · 1 answers · asked by lady di 1

Of course I know it's based on the degradation of radioactive carbon isotopes, which in turn is based on "cosmic rays"... Yet what are cosmic rays? Are they related to dark energy? What, then, if the amount of C14 generated per year in the Earth's atmosphere had changed many times during the evolution of our solar system?

2007-03-16 10:32:45 · 6 answers · asked by Roy Nicolas 5

For AgCl, Ksp = 1.8 x 10^-10 at 25°C. What is the solubility of AgCl at this temperature?

2007-03-16 10:25:27 · 2 answers · asked by MEB 2

In which reaction will decreasing the pressure cause more products to form?

A. 2CO(g) + O2(g)<> 2CO2(g)
B. CO2(g) + H2(g) <> CO(g) + H2O(g)
C. 2H2O2(g) 2H2O(g)<> + O2(g)
D. SrCO3(g) SrO(s) <>+ CO2(g)
E. 3O2(g) <> 2O3(g)

2007-03-16 10:20:05 · 1 answers · asked by MEB 2

i am writing a paper and need to do a outline for alternative fuel using hydrogen

i need at least 4-5 sections
can anybody help with that
like one can be-PRODUCTIOn

2007-03-16 09:45:00 · 2 answers · asked by AC Milan 3

2007-03-16 09:38:02 · 5 answers · asked by bauerri 1

CAN ANY ONE TELL ME HOW
Polonium IS OBTAINED.

2007-03-16 08:53:14 · 1 answers · asked by powerx 1

2007-03-16 08:35:47 · 5 answers · asked by Hiborn 1

Who's law?

2007-03-16 08:30:55 · 3 answers · asked by SadToday22 3

2007-03-16 08:04:41 · 1 answers · asked by Anonymous

a. EPA maximum allowable concentrations of heavy metals in dining hall leftovers before accepting them for dumping in a toxic-waste landfill.
b. Determining the arsenic concentration in a skin biopsy.

2007-03-16 07:25:02 · 3 answers · asked by StormyRene 1

To make a solution with a pH = 4.20 a student used the following procedure :
a certain amount of sodium acetate along with 0.250 moles of acetic acid is added to enough water to make a solution of 1.00 L
How many grams of sodium acetate were added ?

Ka = 1.80 x 10-5

2007-03-16 07:23:22 · 1 answers · asked by mahbubur r 1

Which of the following solutions result in a buffer ?


a) 0.050 L of 0.250 M NH3 + 0.100 L of 0.250 M HCl


b) 0.100 L of 0.250 M NH4Cl + 0.050 L of 0.025 M HCl


c) 0.100 L of 0.250 M NH4Cl + 0.050 L of 0.250 M NaOH


d) 0.100 L of 0.250 M NH4Cl + 0.150 L of 0.250 M NaOH

2007-03-16 07:22:38 · 2 answers · asked by mahbubur r 1

Calculate the pH of a mixture containing equal volumes of
0.340 M HC3H5O2 ( use Ka = 1.30 x 10 -5 ) and 0.340 M NaC3H5O2 .

2007-03-16 07:20:54 · 3 answers · asked by mahbubur r 1

A. molecules,atom, proton
B.proton, atom, molecule
C.atom, molecule, proton
D.molecule,proton,atom
E. atom, proton, molecule

2007-03-16 07:20:14 · 6 answers · asked by ladona c 1

W mesure this to have better biological groth in our plant. nobody can tell how this can have a bad effect on the process

2007-03-16 07:15:44 · 4 answers · asked by Rinkink 1

Could someone tell me what the likely concentration of a lead (II) ethanoate solution used in a further education college would be e.g for use in an electrochemical half-cell

2007-03-16 07:14:42 · 2 answers · asked by Anonymous

To make a solution with a pH = 4.20 a student used the following procedure :
a certain amount of sodium acetate along with 0.290 moles of acetic acid is added to enough water to make a solution of 1.00 L
How many grams of sodium acetate were added ?

Ka = 1.80 x 10-5

2007-03-16 07:10:03 · 4 answers · asked by Anonymous

2007-03-16 07:02:51 · 8 answers · asked by ladona c 1

Consider the following general equation for a chemical reaction. A(g) + B(g) ----> C(g) + D(g)

1) Describe the two factors that determine whether a collision between molecules of A and B results in a reaction.
2) How would a decrease in temperature affect the rate of the reaction shown above? Explain your answer.
3) Write the rate law expression that would result if the reaction proceeded by the mechanism shown below
A+B<-----> [AB] (fast)
[AB]+B----> C+D (slow)
4) Explain why a catalyst increases the rate of a reaction but does not change the value of the equilibrium constant for that reaction.

Thanks!

2007-03-16 06:57:12 · 3 answers · asked by Anonymous

2007-03-16 06:52:35 · 4 answers · asked by ladona c 1

[(1S,3R,7R,8S,8aR)-8-[2-[(2R,4R)-4-hydroxy-6-oxo-oxan-2-yl]ethyl]-3,7-dimethyl-1,2,3,7,8,8a-hexahydronaphthalen-1-yl]2,2-dimethylbutanoate

2007-03-16 06:52:22 · 1 answers · asked by MAri M 1

Hydrogen, oxygen, nitrogen, water, hydrogen perioxide, ammonia, methane, dichloromethane, chloroethanol, carbon dioxide, acetylene, ethanol, acetic acid, benzene, iron oxide?

2007-03-16 06:51:10 · 5 answers · asked by Cindy B 2

Ka value for acetic acid is 1.85x10^-5. Also, I need to calculate the pH of a solution prepared by mixing 15 mL of .1 M NaOH and 30 mL of .1M benzoic acid solution. (benzoic acid is monoprotic, its dissociation constant is 6.5x10^-5.

2007-03-16 06:36:19 · 4 answers · asked by Sarah 1

2007-03-16 06:34:40 · 3 answers · asked by Shailesh P 1

If you have a dicarboxylic acid (HO2C((CH2)4)CO2H)
this is a dicarboxlic acid molecule with 4 intevening carbons, if you treat this with NaOH, H20 shouldnt a alpha hydrogen molecule be removed and attack of the opposite carbonyl occur similar to a aldol reaction of a dialdehyde?
This should form a cyclic molecule with two carboxylic acids. It is obvious that esters undergo aldol reactions (claisen condensation) and aldehydes do also, so wouldnt something in between, a carboxylic acid do the same thing?
Please explain and note any sources, this was a past exam problem that I think I got wrong, so I would appreciate answers quickly before the results are out because I am quite anxious to know how I did since almost all of my friends have converted both carboxylic acids to esters and did claisen condensation.

2007-03-16 06:34:09 · 3 answers · asked by Anonymous

Write the balanced net ionic equations for each of the following reactions:
1) A soluition of sodium thiocyanate id added dropwise to a solution of nickel chloride
2) Solid calcium oxide is heated in the presense of sulfur trioxide gas
3) Equal volumes of .1 M sulfuric acid and .1 M potassium hydroxide are mixed.
4) Calcium metal is heated strongly in nitrogen gas.
5) Solutions of .1 M ammonia and .1 M acetic acid are mixed to the equivalence point.
6) Iron metal is immersed in a solution of silver chloride.
7) A concentrated solution of ammonia is added to a solution of zinc iodide.
8) A solution of copper (II) sulfate is added to a solution of barium nitrate.

Thank you so much! I just don't get these net ionic things!

2007-03-16 06:32:12 · 5 answers · asked by Kacie Valdez 1

To make a solution with a pH = 4.00 a student used the following procedure :
a certain amount of sodium acetate along with 0.320 moles of acetic acid is added to enough water to make a solution of 1.00 L

Ka = 1.80 x 10-5

2007-03-16 06:28:55 · 2 answers · asked by simonkf2002 1