Chemistry - January 2007

Cu^2+ + H2S -> CuS + 2H^+

what is the change in the oxidation state of the copper ion?
THANKS :)

2007-01-08 21:58:19 · 4 answers · asked by pigley 4

2007-01-08 20:40:10 · 5 answers · asked by janna 1

I think it has something to do with the molar heat of fusion for ice...please help, thanks!! :)

2007-01-08 18:59:17 · 3 answers · asked by Anonymous

are there given constant values?

2007-01-08 18:36:13 · 2 answers · asked by botching_aphio 3

In Michael Crichton's Timeline, a character made a paste that was combusted when it came into contact with moisture. What was it made of?

2007-01-08 18:11:34 · 3 answers · asked by Aaron 1

What is this attraction called?
a) atom - atom
b) molecule - molecule
c) molecule - ion
d) ion - ion
e) atom - ion

Thank you for your help!

2007-01-08 17:44:36 · 5 answers · asked by Palladium 1

How to use the Periodic Table to determine the number of electrons and be able to teach a group of kids to understand it?

2007-01-08 17:44:01 · 3 answers · asked by mcdt06 1

A parent cell has 10 chromosomes before dividing

A)will the cell go through binary fission or mitosis and cytokinesis to produce new cells?

B)How many chromosomes will each new cell have after the parent cell divides?

2007-01-08 17:42:29 · 5 answers · asked by babixnaz 1

Why would your muscle cells need food when they have a lack of oxygen when there is plenty of oxygen present? i wonder....

2007-01-08 17:33:43 · 2 answers · asked by babixnaz 1

a resting adult requires about 240 ml of pure oxygen per minute and breathes about 12 times every minute. if inhaled air contains 20 percent oxygen by volume and exhaled air 16 percent, what is volume of air per breath? assume that volume of inhaled air is equal to that of exhaled air)

2007-01-08 17:17:22 · 3 answers · asked by Luciya 2

has anyone ever done this lab?

2007-01-08 17:05:06 · 1 answers · asked by Anonymous

State "does not occur" if the reaction will not take place
a) Na + HNO3 --->

b) Ni(II) + Cu2O -->

c) Zn + Mg(NO3)2 -->

2007-01-08 17:02:28 · 2 answers · asked by princess 1

2007-01-08 16:47:28 · 9 answers · asked by Anonymous

Project

article says...when passed over a precious- metal catalyst such as .ruthenuim the compound reacts with water to liberate hydrogen that can be fed to a fuel cell..so in this case how is the catalyst reacting i am so confused...any hint?i mean usually a catalyst speeds up a reaction...wat about this case?

2007-01-08 16:41:49 · 3 answers · asked by Simply Simple 1

I need to know, like RIGHT NOW!!!
I think its PH

2007-01-08 16:30:24 · 2 answers · asked by Veronica ♥ 5

I'm trying to find this answer on the regular "oh-so-hated" Google engine, but, unfortunately, I have no luck. Anyone help? It's a science project for my brother, we only have about two days until it's due and he hasn't even started. My sibling conscious is making me do this. Anyone help me, please?

2007-01-08 16:14:32 · 8 answers · asked by Mica 1

I have looked at Putrescine, Cadaverine, and Spermidine but I think those are toxic. Any ideas?

2007-01-08 16:11:17 · 6 answers · asked by emailfordon 1

2007-01-08 15:48:50 · 3 answers · asked by sunkisschik 1

have 5M NAOH
10% Sds
Want to make .2M NaOH
1%SDS
And 5ml of it.
How to do this?

2007-01-08 15:40:47 · 1 answers · asked by Vee 5

Petroleum is separated to bitumen, gasoline, tar, etc in a distillation column by heating it up to the products' boiling point respectively. As petroleum is in a liquid phase, does it change to gas phase once it is heated? Are the products in gas phase and later condensed to liquid phase?

2007-01-08 15:37:26 · 3 answers · asked by sarra_hilfiger 2

2007-01-08 15:19:43 · 4 answers · asked by poofydarling06 1

2007-01-08 15:18:33 · 6 answers · asked by sunkisschik 1

how many protons,nuetrons, and electrons are in aluminum?

2007-01-08 15:05:12 · 2 answers · asked by Janelle Alexandria 3

I have 5M NAOH
10% Sds
Want to make .2M NaOH
1%SDS
And 5ml of it.
How to do this?

2007-01-08 14:58:41 · 1 answers · asked by Vee 5

2007-01-08 14:46:00 · 1 answers · asked by Mr. Joshua 1

pleaseee!

2007-01-08 14:36:24 · 3 answers · asked by im not tellin u 1

This is about the tests for differentiating aldehydes or ketones. Thanks in advance!

2007-01-08 14:30:34 · 2 answers · asked by thomasian 2

I do not think that this procedure is one that would work. I am not Christian or anything by that matter but i do believe there is more to life than having blood running through your body. I really think they want your money.

2007-01-08 14:23:06 · 4 answers · asked by necro 3

I'm doing observations for an experiment and would like to know what you would see if you made calcium hydroxide a saturated solution and then heated it up and made it saturated again.

2007-01-08 14:22:57 · 1 answers · asked by untilyoucamealong04 3

[A] Mg-O
[B] C-O
[C] O-O
[D] Si-O
[E] N-O

2007-01-08 14:20:45 · 2 answers · asked by Stephanie 2