Chemistry - November 2007

2007-11-24 10:20:23 · 1 answers · asked by niki_0723 1

2007-11-24 09:52:41 · 10 answers · asked by Anonymous

5.45 x 10 14
3.568 E -7
5.5 x 10 -7
2.99 x 10 8

2007-11-24 09:49:40 · 3 answers · asked by Anonymous

Spinel is a mineral that contains 37.9% aluminum, 17.1% magnesium, and 45.0% oxygen by mass.
Spinel has a density of 3.57 g/cm3, and the edge of the unit cell is 809 pm (1 pm = 10-12 m) in length.

How many of each type of atom are present in the unit cell?

2007-11-24 08:21:15 · 1 answers · asked by Nhat t 1

2007-11-24 08:18:20 · 9 answers · asked by Anonymous

You are given a small bar of an unknown metal X, whose density is found to be 10.5 g/cm3. An X-ray diffraction experiment measures the edge of its cubic-close-packing unit cell as 4.09 Å. Identify X.

2007-11-24 08:16:50 · 1 answers · asked by Nhat t 1

you know, a flame that is green?

2007-11-24 08:12:40 · 4 answers · asked by HotDockett 4

Could someone post a model for the Lewis structure for Ca2+.
Thanks.

2007-11-24 06:46:46 · 3 answers · asked by Anonymous

2007-11-24 06:23:39 · 1 answers · asked by IcanHelpyou:) 3

2007-11-24 06:03:47 · 2 answers · asked by IcanHelpyou:) 3

does increasing the temperature favor the exothermic or endothermic reaction in an equilibrium system? Explain.

2007-11-24 05:33:29 · 2 answers · asked by $Cashmoney$ 1

does increasing the temperature favor the exothermic or endothermic reaction in an equilibrium system? Explain.

2007-11-24 05:32:41 · 1 answers · asked by $Cashmoney$ 1

2007-11-24 05:30:58 · 1 answers · asked by bilinmz 1

I just want the idea on what to do.
The real question I want to solve is this:
What is the pH if I add .01 moles of NaOH to a buffer which has a pH of 3.44?

2007-11-24 05:28:48 · 3 answers · asked by TurkishGamer13 3

2007-11-24 02:27:50 · 2 answers · asked by wmf 1

2007-11-24 01:50:35 · 2 answers · asked by music_junkie 1

Its for my paper, i need to know how it works, step by step. Thank you.

2007-11-23 19:58:55 · 1 answers · asked by Victor 2

1. C2H4(g) + O3(g) -> CH3CHO(g) + O2
in KJ

2. O3(g) + NO(g)-> NO2 (g) + O2(g)
in KJ

3. SO3(g) + H2O(l) -> H2SO4(aq)
in KJ

4. 2NO(g) + O2(g)-> 2NO2(g)
inKJ

2007-11-23 17:48:55 · 2 answers · asked by Anonymous

2N2(g) + 6H2O(g) -> 3O2(g) + 4NH3(g)

you are given the following data:
NH3(g) -> 1/2N2(g) + 3/2H2(g) ΔH= 46KJ
2H2(g) + O2(g)-> 2H2O(g) ΔH= -484 KJ

2007-11-23 17:42:30 · 3 answers · asked by Anonymous

Okay, I don't understand these things:

If you have o.500 mol of KCL, some distilled water, and a 250. mL volumetric flask, how can you make a 0.500 M solution of KCl?

I think it's the concentration formula, Cmolarity= mol of solute / volume of solution, but you would need a 1 Liter flask wouldn't you??

and which of these has a greater mass of solute, 1 liter of 0.1 M NaCl, or 1 L of 0.06 M of Na2CO3? :| please help?

thank you

2007-11-23 16:20:10 · 2 answers · asked by mcstennis09 3

4Fe(s) + 3O2(g) -> 2Fe2O3(s) ΔH= -1652KJ

a. how much heat is released when 4.36mol iron is reacted with excess O2?

b. how much heat is released when 1.04mol Fe2O3 is produced?

c. how much heat is released when 2.26g iron reacted with excess O2?

d. how much heat is released when 10.6g Fe and 1.43g O2 are reacted?

all in KJ

2007-11-23 16:10:28 · 2 answers · asked by Anonymous

2007-11-23 15:25:05 · 1 answers · asked by kathe 1

does rubbing alcohol have Hydrogen peroxide in it?

2007-11-23 15:11:56 · 3 answers · asked by mimi 1

an aqueous solution containing only NaOH is simultaneously 10.71 molal and 9.96 M in the solute. calculate the density in g/cm^3. the answer is 1.328 but how did they get it?
thanks for any insight

2007-11-23 13:49:32 · 2 answers · asked by Levi M 1

hey guys i live in western wisconsin and i'd like to make some black powder ( I have all other ingredients). i heard that charcoal has sulfur in it. is there a way of extracting sulfur

2007-11-23 13:47:51 · 5 answers · asked by Anonymous

I was making my own "Colloidal" silver by electrolysis of distiled water using Silver electrodes. I heat up 8 oz of water to boiling point and then put electrodes and attach to 24V DC. Silver is Sterling Silver 925. I was stirring up water every 10 min. After a hour water turns bright transparent yellow color which is normal by some standards. Then I added 3 drops of H2O2.
What happens I really dont understand is that green cloud forms and after stirring all water turns to transparent brown color. Still water have a little tint green color .

What happened ? Can you answer please.

2007-11-23 12:58:21 · 1 answers · asked by Anonymous

Which of the following is a property of acid solutions?
a. sour taste c. change red litmus to blue
b. slippery feel d. more than one response is correct

2007-11-23 12:33:01 · 3 answers · asked by Anonymous

A water solution is found to have a molar OH- concentration of 3.2  10-5. The solution would be classified as


a. acidic b. basic c. neutral d. can't be classified

2007-11-23 12:32:12 · 1 answers · asked by Anonymous

According to the Arrhenius theory, what is produced when an acid dissolves in water?
a. H+ b. OH- c. H3O+ d. NH

2007-11-23 12:27:25 · 1 answers · asked by Anonymous

Does any one know what the job title would be for someone who discovers and tests new sources of power such as solar and hydrogen? Also, could you suggest a website for this job? Thanks

2007-11-23 12:06:01 · 1 answers · asked by Anonymous