Chemistry - February 2007

how come when something is hot the smoke goes up, but when it's really cold the smoke goes down?

2007-02-21 16:54:22 · 6 answers · asked by j;lkj;lkj;lkj;lkj 2

2007-02-21 16:35:42 · 2 answers · asked by may-may l 1

2007-02-21 16:01:57 · 3 answers · asked by SnapShot 1

C3H7COOH + CH3OH--------> C3H7COOCH3 + H2O

2007-02-21 15:59:55 · 4 answers · asked by kr 1

2007-02-21 15:29:40 · 1 answers · asked by lilaznmeh4eva 2

For ex.
Calcium
20 protons
20 electrons
20 neutrons

does this mean I have to draw 40 dots? Or do I only draw the neutrons? Thanks

2007-02-21 15:23:53 · 1 answers · asked by Besch 4

I need to write the balanced complete ionic equation for NaAl(OH)2CO3. The only problem is that even though I can do this on a basic level, like if I had to do it for CaCO3 or something, I have NO idea how to divide up the ions for this bigger compound.

Help would be massively appreciated, and I'd love an explanation on how to do it so I can do it myself next time.

2007-02-21 15:17:19 · 1 answers · asked by megan_of_the_swamp 4

This question from my homework is driving me nuts! thanks for any help!

Calcium ion triggers the clotting of blood, so when blood is donated, the recieving bag contains sodium oxalate solution to precipitate the Ca2+ and prevent clotting. A 102.3-mL sample of blood contains 7.08×10-5 g Ca2+/mL, and a medical technologist treats the sample with 100.0 mL of 0.1563 M Na2C2O4. Calculate the [Ca2+] after the treatment. (The Ksp of CaC2O4.H2O = 2.3×10-9)

2007-02-21 15:05:14 · 2 answers · asked by thesekeys 3

2007-02-21 15:03:37 · 4 answers · asked by fifififi2000 1

If 1.85 g of helium gas occupies a volume of 12.0 L at 23°C, what volume will 6.13 g of helium gas occupy under the same conditions?

2007-02-21 14:56:41 · 2 answers · asked by Anonymous

(Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.)

2007-02-21 14:47:53 · 1 answers · asked by mitch v 1

just wondering, my bio teacher tells us not to heat it but won't tell us why...

2007-02-21 14:44:07 · 6 answers · asked by someheartsx 1

2007-02-21 14:40:16 · 1 answers · asked by hunnybunny_11_22 1

A gas whose molar mass you wish to know effuses through an opening at a rate one-third as fast as that of helium gas. What is the molar mass of the unknown gas?

2007-02-21 14:11:51 · 1 answers · asked by Anonymous

Especially how can i explain the experiment with a paper and 2 paperclips with the paper acting as the catalyst.

2007-02-21 13:59:55 · 3 answers · asked by SV 1

If Aluminum can, in fact, not be sterilized I would love to know why.

2007-02-21 13:59:53 · 2 answers · asked by bruce m 1

not sure, is anybody out there?

2007-02-21 13:56:06 · 9 answers · asked by z 2

V = 659 mL; n = 0.0967 mol; T = 295 K. What is the pressure?

ideal gas

2007-02-21 13:50:22 · 2 answers · asked by Anonymous

I'm aware that the related compound DMSO is a coupling agent. When MSM is dissolved to saturation in water, can it couple both polar and nonpolar liquids? If so, then how would it be expected to compare (as a coupling agent) in comparison with the following coupling agents? Ethanol, DMSO, acetone, glycerine, propylene glycol, and polyethylene glycol -- between which of them would aqueous MSM be rated?

See
http://en.wikipedia.org/wiki/Methylsulfonylmethane
http://www.chemicalland21.com/industrialchem/solalc/DIMETHYL%20SULFONE.htm

2007-02-21 13:46:50 · 2 answers · asked by zymer5 1

2007-02-21 13:44:08 · 2 answers · asked by Taylor S 2

i need to remove all the chemicals in tap water by using household items. all i want left is pure water just hydrogen and oxygen how do i do it

2007-02-21 13:38:44 · 2 answers · asked by Anonymous

1.) What is the limiting reactant for this equation:
HCL+NaOH>NaCl+H2O
2.0 mol 2.5 mol

2.) For the reactant in the first problem, how do you determine the amount in moles of excess reactant that remains?

3.) From problem one, how do you calculate the amount in moles of each product formed?

4.) If 2.50 mol of copper and 5.50 mol of silver nitrate are available to react by single replacement, identify the limiting reactant

b.) determine the mass of each product formed.

2007-02-21 13:32:19 · 1 answers · asked by Rosy 2

in my class the students are teaching the class about certain topics and i have to teach the class about viscosity. do you have any suggestions or experiments? thanks

2007-02-21 13:27:41 · 4 answers · asked by emily 2

What would happen if MnO2 was mixed with KBrO3 and 9 M sulfuric acid ( H2SO4) ?

2007-02-21 13:25:12 · 1 answers · asked by Alan l 1

Are they s, aq, g, or l
also what is the total ionic and net ionic equations for this.
did the conductivity increase, decrease or stay the same?

2007-02-21 13:17:17 · 1 answers · asked by Erica M 1

Name 5 Sub-Atomic Particles.?

2007-02-21 13:15:47 · 2 answers · asked by enjoying_lyfe 2

balancing equations sucks

2007-02-21 13:14:03 · 1 answers · asked by kiefersgirl4ever 2

What is the total pressure in atmospheres of gas mixture that contains 1.9 g of H2 and 8.2 g of Ar in a 2.5 L container at 27°C? What are the partial pressures of the two gases?

2007-02-21 13:11:52 · 1 answers · asked by Anonymous

2007-02-21 13:11:07 · 1 answers · asked by Anonymous

Na2CrO4 + AgNO3 ---> AgCrO4 + NaNO3

2007-02-21 13:09:40 · 2 answers · asked by qwerty123 1