Chemistry - December 2007

On a small scale, calcium can be isolated through the retion of calcium chloride with sodium metal
CaCl2 + 2Na --> Ca + 2NaCl
Question:
how many moles of NaClare produced by the reaction of 14.0 mol Na?

2007-12-03 10:02:45 · 1 answers · asked by Anonymous

A solution is prepared by dissolving 21.0 grams of K2CO3 in 96.0 grams of water. The solution has a density of 1.17 g/ml. calculate the molarity of the solution. the first thing i did was to add 96 and 21 grams to get 117 grams as the weight of the solution...and from there i was stuck. would i divide 117 by 1.17 to get a 100 ml solution? then ...

thanks in advance!

2007-12-03 09:46:17 · 2 answers · asked by chrissymoo7 3

how do you answer this? please explain it, thanks.

2007-12-03 09:42:09 · 1 answers · asked by Anonymous 1

explain this please

2007-12-03 09:37:55 · 12 answers · asked by DeeDee 1

I will take any random facts about dry ice.

2007-12-03 09:36:36 · 2 answers · asked by K K 2

2007-12-03 09:24:49 · 4 answers · asked by Coope 2

It is from a worksheet called element puns.

2007-12-03 09:06:13 · 2 answers · asked by AJ T 1

1. indicates the shell to which the subshell belongs.
2. may be s, p, d, or f.
3. gives information about the maximum number of electrons the subshell may hold.
4. more than one of the above answers are correct.
5. none of the above answers are correct.

2007-12-03 09:01:42 · 1 answers · asked by Anonymous

How many valence electrons does Molybdenum (element #42) have?

2007-12-03 08:42:33 · 4 answers · asked by ThunderGoalie30 1

2007-12-03 07:51:07 · 9 answers · asked by Anonymous

SAFELY meaning without exploding, its for my science class... it can't be anything with NaCl or H2O since the examples are already in the book, give me something very Interesting, I want a big chemical reaction but no explosion... Cuz I am gonna make an experiment but I dont want to blow somebody's head off....

2007-12-03 07:32:39 · 3 answers · asked by Anonymous

2007-12-03 07:31:40 · 10 answers · asked by Anonymous

What is the volume of a balloon containing 0.37 moles of gas at 25,000 ft if the pressure is 322 torr and -47 °C? Report your answer to the nearest tenth of a liter (one decimal place). (Units: L)
PV=NRT

N=0.37 moles
P= 0.42368421052631578947368421052632
T= = 226.15˚K
R= .0821

0.42368421052631578947368421052632 (P) *V= (0.37 moles)*(.0821)*( 226.15˚K)
V= (0.37 moles)*(.0821)*( 226.15˚K)

V=16.2 L

2007-12-03 07:12:45 · 1 answers · asked by io 1

1. The 3p subshell begins filling at element 13.
2. The 4s subshell becomes completely filled at element 19.
3. The third shell becomes completely filled at element 18.
4. More than one of the above answers are correct.
5. None of the above answers are correct.

2007-12-03 07:08:39 · 2 answers · asked by Anonymous

1. Seven orbitals are present within it.
2. The maximum number of electrons it can contain is 14.
3. All electrons present have the same energy.
4. More than one of the above answers are correct.
5. None of the above answers are correct.

2007-12-03 06:58:04 · 3 answers · asked by Anonymous

could someone help me by giving balanced equations of :
a. reactions of copper(II) hydroxide with hydrogen sulfide
b. silver nitrate and calcium chloride
c.acid rain on marble
d.thermal decomposition of limestone to produce lime
e.muriatic acid, pool acid that causes nails to decompose
f.balanced equation of how milk of magnesia treats heartburn
g.and two reactions tha show how sodium bicarbonate is amphoteric

i am having a hard time with chem.. please help me some... i will give 10 points to the best answers.. please help me if u really know how to do this.. i need to get a lot of points on this homework

2007-12-03 06:54:52 · 2 answers · asked by mj 2

what products are formes from the following reactions? write the chemical equaton to describe each.
a) a nail and hydrochloric acid
b) milk of magnesia and sulfuric acid
c) vinegar and baking soda
d) limestone and acid rain

i dont get any of my chem homework:S

2007-12-03 06:46:34 · 1 answers · asked by mj 2

2007-12-03 06:44:25 · 9 answers · asked by Anonymous

2007-12-03 06:36:10 · 12 answers · asked by Anonymous

2007-12-03 06:35:16 · 11 answers · asked by Anonymous

a 1.00L solution saturated at 25 degrees Celcius with lead(II) iodide contains .54g of PbI2. Calculate the solubility-product constant for this salt at 25 degrees Celcius.

2007-12-03 06:33:49 · 1 answers · asked by thegenuwineone 2

1. have similar chemical properties.
2. are called isotopes.
3. have consecutive atomic numbers.
4. more than one of the above answers are correct.
5. none of the above answers are correct

2007-12-03 06:25:16 · 6 answers · asked by Anonymous

2007-12-03 06:24:12 · 1 answers · asked by boms 1

1) Nitrogen and hydrogen combine to form ammonia according to the reaction N_2 + 3H_2 -> 3NH_3
What is the volume of hydrogen required to combine with 2.2L of nitrogen?
a)2.2L
b) 4.4L
c) 6.6L
d) 44.8L

2) The percent by weight of water in calcium chloride dihydrate, CaCl_2·2H_2O, is:
a) 16.1%
b) 12.2%
c) 24.5%
d) 32.4%

3) In an acidic aqueous solution (the square brackets [ ] denote concentrations):
a)[H+] is less than [OH-]
b)[H+] is less than 1 x 10^-14 mol/L
c)[H+] is greater than 1 x 10^-7 mol/L
d)[OH-] is greater than 1 x 10^-7 mol/L

If and where possible could you explain it as well? Please and thank you.

2007-12-03 06:12:21 · 2 answers · asked by Anonymous

In my class we have to learn about chemical reactions.

Aqueous ammonia + copper hydroxide.
[&&]
Iron Filings + Copper Sulphate

} what are the chemical reactions for each of them??

2007-12-03 06:09:37 · 2 answers · asked by Anonymous

Can u please help me answer these questions?

http://img229.imageshack.us/img229/5973/scankn3.jpg

2007-12-03 05:55:35 · 2 answers · asked by Anonymous

1. all chlorine atoms have a mass of 35.45 amu.
2. some, but not all, chlorine atoms have a mass of 35.45 amu
3. 35.45 amu is the upper limit for the mass of a chlorine atom
4. more than one of the above answers are correct
5. none of the above answers are correct

2007-12-03 05:52:15 · 5 answers · asked by Anonymous

info on these jobs?

2007-12-03 05:39:59 · 3 answers · asked by Anonymous

When NaCl dissolves in water, it dissociates into its constituent ions; of which are attracted to the polar moments of the water molecule. We know this because the solution conducts electrical currents. If a strong anode and a strong cathode were placed into the solution, would the ions (although partly attracted to the water itself) trend to move to the respectve anode, cathode?

Would the Na+ move to area of the solution with anegative charge, and the Cl- move to the opposite end of the solution? If this can be done, could one evaporate the water and be left with Na metal, and Cl2 gas?

or is the thought process by this totally wack. any help would be appreciated.

2007-12-03 04:25:32 · 2 answers · asked by Anonymous

I had a bottle of gatorade (lemon lime) lying around for a few days, it's been in and out of the fridge and theres about 1/6th left in it. I recently noticed some white cloudy stuff in it, what could it be? It's been in my room and nobody's had access to it.


Actually, i just had another look at it and it's not really white but i can tell it apart from the rest of the liquid and it seems thicker..

2007-12-03 03:38:51 · 2 answers · asked by ? 5