Chemistry - March 2007

2007-03-10 15:38:12 · 6 answers · asked by Anonymous

2007-03-10 15:38:11 · 1 answers · asked by Iryna 2

a) HBr : polar

b) CF4 : polar

c) CH3CH2OH : polar

d) PCl5 : nonpolar

2007-03-10 15:34:45 · 4 answers · asked by Anonymous

XeF4 and BrO3-

You give two answers here.
For example if the hybridization of the central atom for the first molecule or ion is sp3, and on the second is sp3d
you enter:
sp3 sp3d
NOTE the SINGLE SPACE between the answers.




Enter s first, e.g. sp3d NOT dsp3

2007-03-10 15:33:41 · 1 answers · asked by Anonymous

You must type the name in, e.g. triangular planar
note that the computer is case insensitive, you can use either upper or lower case letters in the answer you enter.

NOTE: If you need to enter T-shaped enter it with a hyphen, just like it appears here.

2007-03-10 15:29:00 · 1 answers · asked by Anonymous

2007-03-10 15:19:20 · 2 answers · asked by Iryna 2

can you give me all the equations too for that law?

2007-03-10 15:17:02 · 3 answers · asked by Anonymous

2007-03-10 15:16:13 · 2 answers · asked by Anonymous

C(s,graphite) + O2(g) --> CO2(g)
How much heat is evolved when 3.747×101 moles of C(s,graphite) is burned in excess oxygen.
Answer to 4 sig figs.

How much heat is evolved when 1.201×102 g of C(s,graphite) is burned in excess oxygen.
Answer to 4 sig figs.

any idea how to do these two questions?need serious help..step by step solutions please..thank you so much!

2007-03-10 15:14:53 · 1 answers · asked by ichigokun 1

2007-03-10 15:04:31 · 5 answers · asked by Mononkeneo 1

i'd appreciate it if you could share them with me!

2007-03-10 15:01:29 · 2 answers · asked by alexie. 4

If the symbol for the formula of a pure substance is SiCl4, the substance is an atom or a molecule?

2007-03-10 14:53:37 · 5 answers · asked by Anonymous

what is the total number of atoms in the molecule of C12H22N2O8S2?

2007-03-10 14:50:47 · 3 answers · asked by Anonymous

The question is: Methane, the main constituent of natural gas, is burned. How many moles of water vapor are produced from 4.00 g of methane?
The answer is 0.498mol of H20 but I don't know how to get that.
I understand how to do moles to mass but I can't seem to get it this way. Please help me.

2007-03-10 14:50:17 · 2 answers · asked by Anonymous

2007-03-10 14:31:03 · 5 answers · asked by Anonymous

for a chemistry project, i have to figure out how much energy i used in a year. so, if i want to calculate my usage of utilities and gas consumption and look at the bills, how would i do this if i have to get my answer in joules?

2007-03-10 14:26:24 · 2 answers · asked by alexie. 4

2007-03-10 14:18:18 · 2 answers · asked by Anonymous

This sodium oxyanion is found in bleach such Clorox bleach.

What is the chemical formula and the name of the compound?

What common product(s) is the compound found in?


Thanks a lot.

2007-03-10 14:06:17 · 2 answers · asked by Anonymous

2007-03-10 13:57:12 · 4 answers · asked by starcruiserGalaxy2029 2

BUT THE THING IS THAY DID NOT SAY HOW MUTCH SALT OR ELECTIRCITY OR HOW TOXIC THE FUMES ARE IF AT ALL P.S.PURE SODIUM EXPLODES IN WATER BUT MORE LIKE FIREWORKS NOT LIKE A BOMB

2007-03-10 13:55:52 · 4 answers · asked by Anonymous

2007-03-10 13:55:27 · 2 answers · asked by Divine B 1

The alka -selzer rocket i have to do for a sci experment

2007-03-10 13:48:20 · 4 answers · asked by MICHAEL W 1

2007-03-10 13:45:52 · 2 answers · asked by Iryna 2

Must be salt based used for cooking.

2007-03-10 13:35:18 · 5 answers · asked by Dhiren B 2

I know it prevents freezing but exactly how does it do this? If its a chemical reaction then how does it sustain it for very long?

2007-03-10 13:21:57 · 4 answers · asked by pencilmonkey 2

I am currently not able to find a good technique for extracting hydrogen from water. I am using a car battery and copper wires but i cant find a way to get the hydrogen-oxygen mixture into a container (trying to get it into a balloon to explode). If anyone has an idea, a diagram would be helpful, please present it.

2007-03-10 13:18:18 · 5 answers · asked by ihavquestons 2

1: How many moles of hydrogen atoms are there in:
a) 1.60 moles of zinc hydroxide
b) 0.20 moles of sodium hydrogenphosphate-12-water

Also, how do I find the mass of the following samples?
a) 2.65 moles of phosphoric acid, H3PO4

b) 0.0080 moles of mercury (II) iodide

c) 1.60 moles of yellow phosphorous, P4

Please help me. Thankyou.
c) 0.350 moles of ammonium hydrogensulfate

Note: How do I do this...please explain it all to me and show working so that I know how to do these. Do I need to know the formula for these 1st question ones? Please help me.

2007-03-10 13:14:49 · 5 answers · asked by Anonymous

2007-03-10 13:05:41 · 5 answers · asked by Cory W 1

2007-03-10 13:04:21 · 1 answers · asked by kesfla sky 1

Suppose u have a water sample that u want to test for hardness. You titrate the sample but find it so hard that even after u have added all the EDTA in the buret , the endpoint is not reached. Aside from continuing to refill the buret time and time again( which, by the way, is not a good analytical technique), what would u do to perform the analysis? Suggest 2 ways to perform the analysis. Please help me in answering this question related to hardness of water. Thanx in advance

2007-03-10 13:01:15 · 1 answers · asked by Anonymous