Chemistry - June 2007

Zn(OH)^2?
AgI?
Cu(OH)^2?
Ni(OH)^2?

a sample of BaSO^4 (s) is added to pure water and allowed to come to equilibrium at 25 degrees celsius. The concentration of Ba^2+ is 1.05 * 10^-5 M at equilibrium. What is the value of ksp for BaSO^4?

At 25 degrees celsius, the concentration of Ag+ ions in a saturated solution of AgBr is 7.07 * 10^-7 M. What is the value of ksp for AgBr?

A sample of MgCO^3(s) is added to pure water and allowed to come to equilibrium at 25 degrees celsius. The concentration of Mg^2+ is 6.3 * 10^-3 M at equilibrium. What is the value of ksp for mgCO^3?

2007-06-13 06:08:34 · 3 answers · asked by Ashley T 1

I have a GCSE chemistry exam tomorrow and i really don't understand electrolysis. could anyone explain it in quite simple terms. The main thing i need to know, is does the cathode or anode contain pure copper? I would be greatful of any help possible.

2007-06-13 06:01:34 · 5 answers · asked by scary fairy 3

2007-06-13 04:19:18 · 6 answers · asked by howard 1

So I went to a grand party yesterday at which I was chosen by the guest magician (lol...) to perform with him. He asked me to take a note out of my wallet and sign my name ALL OVER on it with his marker. Unfortunately, I was in a hurry when I left my house that I just stuffed a $100 bill into my wallet... and I signed my name ALL OVER one face of the bill...

The magician did his trick. All the partygoers applauded. BUT WHAT THE ******* HELL AM I GONNA DO WITH MY GODDAMN MARKER STAINED $100 BILL? Mind you I'm only 16 and $100 means a lot to me...

I'm desperate. Please help, thanks.

2007-06-12 23:08:08 · 3 answers · asked by Crossroads 3

2007-06-12 22:56:40 · 9 answers · asked by Anonymous

Please help with all you can. Thanks

1. √100a^4b^2c^2

2. (√x-√y)^2

3. 12√15-9√75+8√45-6√225

4. √x^5/y^2

5. √24/16

2007-06-12 20:29:01 · 1 answers · asked by ~♥♥♥~ 3

addition reaction related to hydrocarbons!!

2007-06-12 19:36:51 · 4 answers · asked by Anonymous

Single, double, or triple.

2007-06-12 17:57:21 · 3 answers · asked by S 4

Any help?

2007-06-12 17:14:58 · 2 answers · asked by Jenny3360 1

2007-06-12 15:46:04 · 4 answers · asked by gunjan p 1

2007-06-12 14:40:31 · 3 answers · asked by dorito 1

is there a website that can help me find anything about nickel plz and thank you i've tryed google

2007-06-12 13:56:17 · 4 answers · asked by BABY_BOO90 2

Only the 2nd part... Sorry for bugging

Even with the fine help you guys have given me, someone please explain!

N2H4 (g) + O2 (g) --> N2 (g) + 2H20 (I) Delta H=-628 KJ

How many grams of Hydrazine (N2H4) would be required to produce 963 KJ of heat?

If the reaction was at standard temperature and pressure, how many liters of N2 gas would evolve if the amount of N2H4 found in part (a) was burned?

2007-06-12 13:31:06 · 3 answers · asked by Zach A 1

please this is important to me!

2007-06-12 13:19:11 · 3 answers · asked by Angel V 1

Somebody please answer the second question!

N2H4 (g) + O2 (g) --> N2 (g) + 2H20 (I) Delta H=-628 KJ

How many grams of Hydrazine (N2H4) would be required to produce 963 KJ of heat?

If the reaction was at standard temperature and pressure, how many liters of N2 gas would evolve if the amount of N2H4 found in part (a) was burned?

2007-06-12 13:09:06 · 3 answers · asked by Zach A 1

This is a question on my chemistry lab, any help?

2007-06-12 12:54:22 · 2 answers · asked by jmssky 4

2007-06-12 12:40:07 · 1 answers · asked by Anonymous

U(s) + 3F2 (g) --> UF6 Delta H=-2113KJ

How much heat is released when 1.00 Kg of uranium reacts with flourine?

N2H4 (g) + O2 (g) --> N2 (g) + 2H20 (I) Delta H=-628 KJ

How many grams of Hydrazine (N2H4) would be required to produce 963 KJ of heat?

If the reaction was at standard temperature and pressure, how many liters of N2 gas would evolve if the amount of N2H4 found in part (a) was burned?

2007-06-12 12:32:44 · 4 answers · asked by Zach A 1

How do you make silly puddy??

2007-06-12 11:49:41 · 1 answers · asked by McKenzie 1

Consider the reaction
i2O2(g)+5CO2(g)--->5CO2(g)+i2(g)
a) 80 grams of i2O5 reacts with 28 grams of carbon monocxide, CO.
Determine the mass of iodine i2, which could be produced?
b) If, in the above situation, only .160 moles of iodine, i2 was prodiced...
-What mass of iodine was produced?
-What percentage yield of iodine was produced?

Thank you for all your help! Please try to explain!

2007-06-12 11:43:38 · 5 answers · asked by Anonymous

Neutrons: charge?

Proton: charge?

Electron: charge? mass in scientific notation?

2007-06-12 10:56:45 · 7 answers · asked by Anonymous

Can someone give me a clear discribtion of the position of solids, liquids and gases in the periodic table, and description of how the metals, metalloids, and non-metals are organized in the table.

2007-06-12 10:51:20 · 5 answers · asked by Anonymous

Equal masses of three different ideal gases, X, Y, and Z, are mixed in a sealed rigid container. If the temperature of the system remains constant, which of the following statements about the partial pressure of gas X is correct?

a) it is equal to 1/3 the total pressure
b) it depends on the intermolecular forces of attraction between molecules of X, Y, and Z
c) it depends on the relative molecular masses of X, Y, and Z
d) it depends on the average distance traveled between molecular collisions
e) it can be calculated with knowledge only of the volume of the container

Thankss

2007-06-12 10:48:26 · 3 answers · asked by Anonymous

which is an observation?
A) an acid produces h+
b) an acid produces H3O+
C) an acid turns litmus paper blue
d) an acid has a proton which can be given to another substance

btw, the answer is C, but WHY? can someone please explain it to me? thanks in advance

2007-06-12 10:04:44 · 6 answers · asked by zxc 2

2007-06-12 09:51:55 · 0 answers · asked by Anonymous

2007-06-12 09:43:17 · 2 answers · asked by deneshia t 1

2007-06-12 09:26:09 · 1 answers · asked by Smile 2

In terms of osmosis

2007-06-12 09:15:36 · 3 answers · asked by Anonymous

Hi, i wonder if anyone can tell me a way of how to talk an air sample of my room becuase i would like to measure the amount of CO2 in it for a personal experiment.
I am studing AS level chemistry so i have some knowledge of calculations etc.
I would like to know a way of doing this without the use of complicated equipment.
I know the chances are it is not possible but i would just like to make sure. Any help will be appreciated. Thanks

2007-06-12 08:22:50 · 1 answers · asked by Billy h 1

2007-06-12 07:39:20 · 4 answers · asked by Anonymous