Chemistry - March 2007

Would they have the same mass or contain the same number of molecules?

2007-03-29 12:41:44 · 9 answers · asked by Panthera 2

I am having a hard time doing this. I can't answer these questions.

CH3-CH2-CH=CH2 H2O/H+ --------------

2 CH3SH [O] ---------------------

2007-03-29 12:37:59 · 1 answers · asked by shortydidi03 2

The concentration of HF is also listed as 0.0299 mol/l. The 0.59 g/l is generated in a stream flow of 0.005 gpm of a total of 7.72 gpm. I can only send an average of 17 ppm to drain per day.

2007-03-29 12:35:14 · 1 answers · asked by thekeanes 1

A sample of nitrogen gas kept in a container of volume 2.3L and at a temp of 305K exerts a pressure of 4.7 atm. Calculate the number of moles of gas present.

2007-03-29 11:55:14 · 5 answers · asked by Me 3

Which of the following substances contains a triple bond?
H2S,H2CO,HOF,C2F2,BF3.
Please explain the method used to solve.

2007-03-29 11:42:05 · 2 answers · asked by Blesson 2

2007-03-29 11:35:09 · 3 answers · asked by EbBz 1

There are 3 choices: corn starch, baking soda, and talcum powder.

2007-03-29 11:20:21 · 1 answers · asked by Susan S 2

2007-03-29 10:10:56 · 5 answers · asked by Anonymous

What is the effect of acid rain (nitric acid) on statues, if they are made of marble (calcium carbonate)?

2007-03-29 09:55:21 · 2 answers · asked by Anonymous

a. drops from a higher to a lower energy level.
b. jumps from a lower to a higher energy level.
c. moves within its atomic orbital.
d. falls into the nucleus.

2007-03-29 09:42:33 · 6 answers · asked by chrissylee777 1

How do the energy differences between the higher energy levels of an atom compare with the energy differences between the lower energy levels of the atom?

a. They are greater in magnitude than those between lower energy levels.
b. They are smaller in magnitude than those between lower energy levels.
c. There is no significant difference in the magnitudes of these differences.
d. No answer can be determined from the information given.

2007-03-29 09:40:07 · 2 answers · asked by chrissylee777 1

I cant get this HW problem correct..

What is the molarity of ZnCl2(aq) that forms when 15.6 g of zinc completely reacts with CuCl2(aq) according to the following reaction? (Assume a final volume of 175 mL.)
_______M

Zn(s) + CuCl2(aq) ZnCl2(aq) + Cu(s)

i keep getting something like 1363.249. i know its wrong but i think its way off help would be appreciated.

2007-03-29 09:31:30 · 2 answers · asked by Krazyk78 1

Describe the type of reaction that occurs between certain metals and an acid.

2007-03-29 09:18:44 · 3 answers · asked by Anonymous

can someone plz help mii i got a homework that, wants mi to make 50 words using periodic table can someone help me?

2007-03-29 09:12:58 · 9 answers · asked by Anonymous

2007-03-29 09:10:09 · 8 answers · asked by MATT C 1

2007-03-29 08:49:03 · 1 answers · asked by littlefrog234 1

how do you balance this
NO2+ O+H2O---- HNO3

2007-03-29 08:29:13 · 2 answers · asked by cowgirlemmy172 2

H2)
I2
KOH
NH3

i appreciate the answers guys but can u tell me how u get them too.

2007-03-29 08:10:04 · 3 answers · asked by stacie b 2

AL+CL2--->ALCL3
MG+N2--->Mg3N2

2007-03-29 07:58:21 · 4 answers · asked by stacie b 2

Building something with atoms so tight, it would be considered one of the hardest and unbreakable objects in the world. I was considering I trying to go through with a research project for it. Do you think it's possible?

2007-03-29 07:57:46 · 3 answers · asked by Bleeble Blabble 3

Can someone please balance this equation?

Mg3N2(s) + H2O(l) ---> Mg(OH)2(aq) + NH3(g)

2007-03-29 07:52:46 · 5 answers · asked by Madera 2

Assume the % transmittance for a solution is 54.1% at a wavelength of 325nm. What is the absorbance?

Would I take the negative log of .541 to get the absorbance? Do I have to do anything with the wavelength in this problem?

2007-03-29 07:29:11 · 5 answers · asked by calculusgirl1979 2

2007-03-29 07:21:48 · 2 answers · asked by nik 1

a Ne atom has 10 protons in its nucleus & 10 neutrons in the nucleus. What is the mass in a.m.u.?

2007-03-29 07:20:18 · 7 answers · asked by ladona c 1

2007-03-29 07:16:05 · 5 answers · asked by Anonymous

98 g H2SO4(sulfuric acid) is equal to ___________ moles of sulfuric acid.

0.005 g of HCl(hydrochloric acid) is equal to ________________ moles of HCl

2007-03-29 07:13:38 · 5 answers · asked by stacie b 2

2007-03-29 06:58:55 · 4 answers · asked by ladona c 1

1. 1 mole of HCl is equal to __________g(grams) of HCl
2. 1 mole of CaCl2 is equal to __________ g of CaCl2
3. 2 moles of (NH4)2SO4 (ammonium sulfate) is equal to _________g of ammonium sulfate




i dont understand how to do these at all anyhelp will be appreciated

2007-03-29 06:45:01 · 9 answers · asked by stacie b 2

Ok, I understand that a car battery -- any battery -- has a finite lifespan; you cannot create energy indefinitely from a fixed batch of chemicals. In the normal course of operating a car, the battery is recharged as it goes, and it has an expected life of, say, 5-8 years.

But does leaving your lights on and car off, for instance, reduce the lifespan of the battery? Once it's been drained, why doesn't recharging it (by a jumpstart and the car's alternator) just simply refresh it as a car's normal operation would?

What's the difference between the two processes that reduces the battery's life in one case but not the other? What's happening at the chemical-reaction or molecular level?...

Thanks.

2007-03-29 06:06:13 · 3 answers · asked by no_good_names_left_17 3

2007-03-29 05:59:51 · 1 answers · asked by Anonymous