Chemistry - August 2007

The density of air at room temperature is (25 C) is 1.11x10^-3 kg/L. How many grams of air are in a room measuring 12.1 x 7.2 x 2.0 m?

please show your work so I can check it against mine... Thanks for your help!!

2007-08-31 06:33:38 · 7 answers · asked by C K 3

HCl + THC ---->

2007-08-31 06:31:02 · 2 answers · asked by Anonymous

Fluorine has a single atomic species, 19F. Determine the atomic mass of 19F by summing the masses of its protons neutrons and electrons, and compare with the value of the atomic mass from the periodic table. Explain why the agreement is poor

2007-08-31 06:24:54 · 1 answers · asked by Mr.Pie 1

how many can it contain all at once?

2007-08-31 06:18:26 · 0 answers · asked by Mutley 6

2007-08-31 06:08:20 · 13 answers · asked by jeffrey p 1

The reaction 2NO --> N2 + O2 has the following rate law:

-D[NO]/Dt = 2k[NO]^2

After a period of 2.0 x 10^3 s, the concentration of NO falls from an initial value of 2.8 x 10^-3 mol/L to 2.0 x 10^-3 mol/L. What is the rate constant, k?

2007-08-31 06:06:47 · 1 answers · asked by Anonymous

Rank the energies from lowest energy to highest energy:

FM radio waves
X-rays
microwaves
visible light
ultra violet
gamma rays
AM radio waves

2007-08-31 03:37:03 · 2 answers · asked by Caramel 2

While pumping with a 2-stage Cryopump (1st Stage at 75 K; 2nd Stage at 12 K) Why does Argon kondensate in the second stage, even though its melting point is around 84K??

2007-08-31 03:26:30 · 1 answers · asked by Ricardo R 1

2007-08-31 02:35:47 · 10 answers · asked by Kenz 2

is apolluted water's strem allso polluted.

2007-08-31 01:06:15 · 4 answers · asked by Anonymous

even just in small amounts. let say 30g to 50g.

2007-08-31 00:15:52 · 5 answers · asked by quackie81 3

2007-08-30 21:30:44 · 1 answers · asked by grkgrl79 1

Through my previous questions I have seen that my teacher has made many mistakes about charges. Therefore, I would like to clear up more discrepancies between my teacher and the book.

My teachers says that nitrogen could form cations of +3 and +5 but I thought nitrogen could only form the anion -3?

Also, I thought phosphorus, arsenic, and antimony formed anions of -3 and not cations of +3?

And could helium form cations of 2+? I thought helium was a noble gas?

Lastly, I thought th at cesium formed cations of 1+ and not anions of 1-?

Am I crazy or is my teacher crazy?

2007-08-30 21:07:57 · 4 answers · asked by Anonymous

My book says its - yet my teacher says its 2-. I also have another discrepancy. My teacher says that Copper could form anions of Cl- and Cu 2-. How could copper form a chlorine anion? Isnt it that copper could only form Cu- and Cu 2-?

2007-08-30 20:47:04 · 3 answers · asked by Anonymous

Recently my brother brought a stone, which it can be weaght 3 to 4 killos. But it comes water from that. what is the significant? Please suggest me and if some one is interest to do research on that i'm going to share my e-mail address.

2007-08-30 20:22:03 · 2 answers · asked by LoCo#33 1

i was asked to do this qns. However, i am not sure how to do. this is my first time to write about:
How to prepare sodium chloride???

2007-08-30 19:35:28 · 3 answers · asked by Tommy 1

I think I understand the concept vaguely, but I can't grasp how it would work realistically.

For example....you have A + B -> (<-) C + D

Let's say I originally start with 1 gram of A and B. After a while, will it become so I have 1 gram of C and D? Or 0.5 grams of A, 0.5 grams of B, 0.5 grams of C and 0.5 grams of D?


If this is the case, what happens when I add one more gram of A? According to what I know about Le Chatelier's principle, the reaction should proceed to the right....but thinking about this realistically, how can it?????? If originally there is 1 gram of each, A and B. And they react with each other equally, how can adding an extra gram of A make more product......if the original gram of A has already finished reacting with the one gram of B to make the products?? (or vise versa)

If this is not the case, please explain. I'm pretty lost, and I want to figure this stuff out cuz I will be working with buffer problems and weak acid problems, etc. Thanks

2007-08-30 19:30:01 · 3 answers · asked by Anonymous

2007-08-30 18:36:54 · 4 answers · asked by Anonymous

2007-08-30 18:26:14 · 3 answers · asked by Anonymous

I am a confused chemistry moron. :(

2007-08-30 18:12:34 · 2 answers · asked by mountain_laurel1183 5

at sea level, water being pure

2007-08-30 17:24:02 · 11 answers · asked by Mr. Quimby 2

2007-08-30 17:19:25 · 7 answers · asked by teng 1

in the first problem its asking me how would i separate the mixtures of KBr and BaSO4

in the second one its asking me, suppose i have a mixture of Mg(OH)2 and BaSO4, how would i separate this mixture.

2007-08-30 16:09:53 · 3 answers · asked by orange_crush_05 6

I don't know..please help me.

2007-08-30 16:08:24 · 1 answers · asked by shadowpal2 2

does anyone know a fun easy science project?

2007-08-30 15:58:07 · 5 answers · asked by Joss 1

Given stock solutions of glucose (2M), glycine (200mM), and NaCl (500mM), how much of each solution do you need to prepare 500 mL of a reagent that contains 0.05 M glucose, 10 mM glycine and 10 mM NaCl?


Do I just use the equation of M1V1=M2V2?

(2M)(?)=(0.05M)(0.5L) ?=0.0125L of glucose

(0.2M)(?)=(0.01M)(0.5L) ?=0.025L of glycine

2007-08-30 15:42:27 · 1 answers · asked by Anonymous

my son would like to know if someone out there knows what it is that makes them pop and if it could be made at home. i'm guessing it's some kind of cardon dioxide thing going on but, i really have no idea. thanks for your help.

2007-08-30 15:42:01 · 2 answers · asked by racer 51 7

b) How many molecules of a gas will be produced?

Please show me how to get to the solution also. Thanks!

2007-08-30 15:24:10 · 4 answers · asked by hotlilmamax2 1

I would like an explaination please.

2007-08-30 14:55:49 · 3 answers · asked by Anonymous

2007-08-30 14:11:28 · 3 answers · asked by janice v 1