Chemistry - March 2007

An unknown volume of water at 18.2°C is added to 24.3 mL water at 35.6°C. If the final temperature is 23.5°C, what was the unknown volume? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)

2007-03-12 13:37:01 · 1 answers · asked by pinay804 2

Find the molar mass for Ca3(PO4)2
(the 3,4, and 2 should be suscript)
If you have time, please explain to me HOW you got your answer. Thank you!

2007-03-12 13:32:17 · 3 answers · asked by Anonymous

How many milliliters of 20.9 M H2SO4 are required to react with 250. mL of 2.13 M Al(OH)3 if the products are aluminum sulfate and water?



helppp mee!!

2007-03-12 13:30:40 · 2 answers · asked by Maddi J 2

2007-03-12 13:29:28 · 2 answers · asked by Anonymous

2007-03-12 13:22:46 · 3 answers · asked by Anonymous

2007-03-12 13:22:05 · 4 answers · asked by Anonymous

linear and direct relationship r same right? when temperature is lowered the volume decreases?? if a pressured gas is released from vessel, ice can be seen forming on the outside of the vessels, why does this happen??

2007-03-12 13:21:46 · 1 answers · asked by Preeya 5

......what?
also one kilocalorie=_________calories
also the specific heat capacity of a substance is defined as what?

2007-03-12 13:18:26 · 2 answers · asked by Anonymous

I have tried using the n=pv/rt but what else am i suppose to do inorder to arrive at the answer which is 0.25nM. Can someone please play with this a little bit for me so i could know what steps to take. thank you

2007-03-12 13:17:37 · 4 answers · asked by wale o 1

2007-03-12 13:16:12 · 1 answers · asked by SylverC 1

please give sources of websites. I also need uses for it , when it was discovered, how it got its name, and where you can find it.

2007-03-12 13:14:42 · 2 answers · asked by DinoMan 2

I have tried looking everywhere, but I can't find anything. I added Fe 3+ ion solution to my unknown acid solution and it immediately turned purple. What does this tell me? Also when I burned the solid unknown acid a slightly green flame was observed. Again what does this tell me?

Potentially the unknown acid has a molar mass of around 142 g/mol and a melting point of 143 C. If someone could direct me of where to look for this information. I have the CRC handbook of chem and physics but theres over 500 pages of data which isn't organized by molar mass or melting point. So is there somewhere I can easily identify my acid with this information?

2007-03-12 13:12:46 · 2 answers · asked by thee_guy 2

A copper refinery produces a copper ingot weighing 150 lbs. If the copper is drawn into wire whose diameter is 8.25 mm, how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/ cm^3

2007-03-12 13:12:38 · 2 answers · asked by Alan l 1

How do I calculate the pH of HC2H3O2 when all I have is the Ka value of 1.8*10^-5 and the concentration of HC2H3O2 which is 1.0*10^-1.

2007-03-12 13:06:23 · 2 answers · asked by p_rob22 1

ALSO, if you can provide a website ( BESIDES WIKIPEDIA) that tells me what forensics is that would be great!

2007-03-12 13:03:50 · 1 answers · asked by Anonymous

2007-03-12 12:55:36 · 4 answers · asked by Anonymous

Please help, I dont understand

Predict the products of the reactions below. Then, Write the balanced equation and classify the reation.

1. magnesium bromide + Chlorine
2. aluminum + iron (III) oxide
3. silver nitrate + zince chloride
4. hydrogen peroxide (catalyzed by manganese dioxide)
5. zinc + hydrochloride
6. sulfuric acid + sodium hydroxide
7. sodium + hydrogen
8. acetic acid + copper

Thank you sooo much!

2007-03-12 12:53:05 · 0 answers · asked by Bridget 2

1- lithium oxide
2- beryllium chloride
3- titankum (three) nitrate
4- coblat (three) hydroxide
can you please tell me what the formulas would be?

2007-03-12 12:38:43 · 3 answers · asked by Anonymous

how would i convert the specific heat capacity of ethanol ... 158J/g (what i got) to kJ/mole...

ps: ,methanol molar mass= 32

2007-03-12 12:38:38 · 4 answers · asked by pubpubpub b 1

I know there was a shuttle mission in 1998 called STS-95 where an experiment was conducted by John Glenn, but I can't find anywhere that has the results.

If you don't know the answer, but could point me in the right direction it would be greatly appreciated. Thank you all

2007-03-12 12:37:29 · 2 answers · asked by Anonymous

2007-03-12 12:36:53 · 1 answers · asked by Anonymous

HINT: find Kb from Ka of the conjugate acid

It would be greatly appreciated if you could show how you derived the answer.
Thanks!

2007-03-12 12:36:48 · 2 answers · asked by Anonymous

2007-03-12 12:32:15 · 2 answers · asked by Tb 1

____ + __P + __O2 ----> H3PO4

2007-03-12 12:16:25 · 3 answers · asked by tray 1

2007-03-12 12:14:37 · 17 answers · asked by violinmaster 1

2007-03-12 12:09:49 · 14 answers · asked by Anonymous

2007-03-12 12:00:48 · 3 answers · asked by claymate14249 1

help me in science

2007-03-12 11:59:43 · 2 answers · asked by Melissa M 1

What is the oxidation of the nitrogen in this case NaN3

2007-03-12 11:57:46 · 3 answers · asked by Pat M 1

I need the crystal structures of Borax crystals and Alum crystals..
And Bluing Solution crystals. Any of the above would be much appreciated

2007-03-12 11:55:41 · 2 answers · asked by eddy munstrub. 1