Chemistry - July 2007

potassium bromide in sulfuric acid
hydrogen bromide in sulfuric acid

2007-07-29 17:10:34 · 2 answers · asked by Anonymous

Normal Temp Pressure and Standard Temp Pressure.Are these terms same or different ?

2007-07-29 16:57:23 · 2 answers · asked by Rajchem 2

2007-07-29 15:26:55 · 3 answers · asked by Anonymous

2007-07-29 14:53:24 · 5 answers · asked by medz 2

An experiment was performed in which an empty 100 mL graduated cylinder was weighed. It was weighed once again after it had been filled to the 10.0 mL mark with dry sand. A 10mL pipet was used to transfer 10.0 mL of methanol to the cylinder. Use the data (below) to find the density of dry sand, the density of methanol, and the density of sand particles.

Mass of cylinder plus wet sand 45.2613 g
Mass of cylinder plus dry sand 37.3488 g
Mass of empty cylinder 22.8317 g
Volume of dry sand 10.0 mL
Volume of sand + methanol 17.6 mL
Volume of methanol 10.00 mL

I was able to get the first two densities, but how do you find the density of sand particles?

2007-07-29 10:51:42 · 3 answers · asked by Anonymous

A 12.5843g sample of ZrBr4 was dissolved and, after several steps, all of the combined bromine was precipitated as AgBr. The silver content of AgBr was found to be 13.2160g. Assume the atomic masses of silver and bromine to be 107.868 and 79.904. What value was obtained for the atomic mass of Zr from this experiment?
(I have the correct answer but I need to know the procedure for solving the problem)

2007-07-29 10:41:56 · 3 answers · asked by Tastytaint 1

and don't tell me about carbonation, because that's not what I'm going for.
I watch the bubbles rise forever and it looks like they're coming from the bottom of the glass, but theres nothing down there. it's just a constant stream of bubbles appearing out of nowhere. I'm sure it has to be some kind of chemical reaction, but why does it only happen in a few places at the bottom? why not all over?
It's the most mind boggling mystery to me.

2007-07-29 09:55:54 · 10 answers · asked by hobo 6

chem 2 question .

we place 1.32 mol PCl5 in a 1.0 L flask and allow it to reach equillibrium ata given temp. What it the final concentration of Cl2 in the Flask.

PCl5--> PCl3+Cl2

Kc= .47

The answer is 0.59 M

but how do you get it?

2007-07-29 07:33:52 · 2 answers · asked by jo d 2

Okay another question

A mixture of .200 mol NO2 and .200 mol CO is placesd in a 1.00 L flask and given time to equilibriate. Analysis of the equillibrium mixture indicates that 0.134mol of CO2 is present calculate Kc for the reaction.

NO2+CO ---> NO + CO2

the answer is 4.1

I am unsure how to figure it out. please help.

2007-07-29 07:16:30 · 4 answers · asked by jo d 2

A 4.00 L flask is filled .75mol of SO3 , 2.5 mol SO2 and 1.3 mol O2, and allowed to reach equillibrium. Predict the effect on the concentrations of SO3 as equillibrium is achieved by using Q, the reaction quotient. Kc= 12
the answer is[SO3] will decrease because Q
MY question is how do you get that

2007-07-29 06:55:15 · 2 answers · asked by jo d 2

2007-07-29 06:55:02 · 5 answers · asked by Dee Dee 2

2007-07-29 04:49:16 · 3 answers · asked by Anonymous

2007-07-29 04:07:12 · 6 answers · asked by Selva G 1

I'm doing sum physical science paper and i nid to noe wat's the solute and solvent of wine!!!

2007-07-29 03:50:19 · 6 answers · asked by Frederick 2

bond notation was like this : ...
...
....... ... .......
...
circle

2007-07-29 02:56:52 · 3 answers · asked by 007 Bond 2

There's this question that im suppose to write a 150 words essay on:
Compare and contrast the difference between detergents that have enzymes and those that do not have enzymes.
pls help?

2007-07-29 02:17:51 · 3 answers · asked by blehheh 3

I am having difficulty setting up these problems:

1. Calculate the number of grams of solute in 2.5L of a 3.00M HCl solution
2. Calculate the volume, in ml, of solution required to supply the following:2.00g of glucose from a 4.20M glucose solution

2007-07-29 02:14:02 · 3 answers · asked by pwbapro 1

Reaction of hydrogen at a partial pressure of 0.588 atm and oxygen at a partial pressure of 0.302 atm in a 5.00 L reaction vessel produced gaseous water.. Which gaseous element is the limiting reactant in the reaction?


It's super difficult for me. I hope you guys can help me out.

10 pts for the best answer. =)

thanks!

2007-07-29 01:40:16 · 2 answers · asked by carbonara 2

2007-07-29 00:38:03 · 2 answers · asked by mysterygirl 1

2007-07-29 00:19:12 · 2 answers · asked by thina a 1

2007-07-28 22:49:18 · 7 answers · asked by Anonymous

Thx for helping juz now... erm... sorry for the next question... Cuz i m not gd in science... but math... i m good at it... thx for helping again.. :)

2007-07-28 22:48:26 · 4 answers · asked by Anonymous

erm... i need it quickly... Cuz i hav a project due at wednesday and worst that today i need the ans... i am sorry if i am rude over here... (if there is :) ) thx

2007-07-28 22:40:06 · 6 answers · asked by Anonymous

Why is a sodium carbonate solution more alkaline than a sodium bicarbonate solution?

2007-07-28 22:02:48 · 2 answers · asked by Nicole J 1

KHC4H4O6 + NaHCO3 will yield ??
HC2H3O2 + NaHCO3 will yield ??

2007-07-28 22:00:51 · 2 answers · asked by Nicole J 1

Dry-chemical fire extiguiguishers contain NaHCO3. How might powered NaHCO3 help extinguish a fire?

2007-07-28 21:56:51 · 2 answers · asked by Nicole J 1

Electrical

2007-07-28 21:34:28 · 6 answers · asked by A E 1

Iam working in a bioanalytical area i would like toknow the answer for this question.

2007-07-28 21:29:05 · 5 answers · asked by Manoj kumar 1

2007-07-28 21:09:19 · 2 answers · asked by david m 2

2007-07-28 21:07:59 · 2 answers · asked by david m 2