Chemistry - January 2007

(a) What is the composition in mole fractions of a solution that has a vapor pressure of 43 torr at 20°C?
(b) What is the mole fraction of benzene in the vapor above the solution described in part (a)?

2007-01-20 09:19:56 · 3 answers · asked by magicalplaygirl 1

Using hydrogen chloride as an example, explain the role of water in acid production. Include an equation in your answer.

2007-01-20 09:18:43 · 3 answers · asked by Anonymous

Is it 120 degrees celsius by any chance?...

2007-01-20 09:17:18 · 7 answers · asked by Cranberrydude 3

Why is it
O
/ \
H H
instead of
H-O-H

2007-01-20 09:07:09 · 5 answers · asked by Levi K 1

explination please

2007-01-20 09:04:26 · 3 answers · asked by Anonymous

When using a medicine dropper, you squeeze the rubber bulb and insert the end of the tube into a liquid. Why does the liquid rise inside the dropped when you release the bulb?

2007-01-20 08:53:28 · 4 answers · asked by Anonymous

i need the explanation!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2007-01-20 08:45:10 · 3 answers · asked by Anonymous

What are some chemical and physical properties of codeine?

2007-01-20 08:34:57 · 13 answers · asked by Anonymous

I have an Intro to Chem exam Tues morning and the instructor posed this question during our review last week. I cannot find the answer anywhere in my notes or in the text. Can anyone please assist with the correct answer. Thank you.

2007-01-20 08:33:31 · 3 answers · asked by Cherriest 7

ive seen pictures of beams in the twin towers that looked they have sliced like a hot knife through butter

2007-01-20 08:07:04 · 4 answers · asked by jygolfer_72 1

Okay:
So I have this question, but have no clue how to tackle it.

Iron conentrations of 0.2 and 0.3 ppm in water can cause fabric staining when washing clothes. A typical wash uses 12L of water. What is the maximum mass of iron that can be present so that the clothes will not be stained?

Please help:(

2007-01-20 08:05:08 · 1 answers · asked by Viktor Z 1

I need some help understanding the scientific answer to this. It was asked in relation to our Gases and Stoichiometry unit.

Thanks!

2007-01-20 07:53:42 · 2 answers · asked by Anonymous

2007-01-20 07:09:42 · 5 answers · asked by charming_danielrizal 1

What would the electron configuration of [Pt]2+ be? I can't figure it out, it keeps telling me I'm wrong (I had to do about 12, and this is the only one I couldn't figure out.)

Thanks.

2007-01-20 06:56:52 · 1 answers · asked by countrygurl587 3

2007-01-20 06:49:40 · 8 answers · asked by patrick 1

2007-01-20 06:43:35 · 3 answers · asked by linifer74 1

Looking for the symbol for dynamite. ie...o is oxygen, h is hydrogen, etc..

2007-01-20 06:41:56 · 2 answers · asked by Anonymous

2007-01-20 06:41:11 · 1 answers · asked by linifer74 1

How many ml (milliliters) of a 40 percent alcohol solution must be mixed with a 70 percent alcohol solution to obtain 30 ml of a 52 percent alcohol solution.

2007-01-20 06:38:34 · 1 answers · asked by Anonymous

Midterms are in 5 days, I've got everything down except for this ionic and covalent bonding stuff! Please tell me the difference between them. I'm in 7th grade, so not too advance, please. Thanks!

2007-01-20 06:35:56 · 4 answers · asked by Gia 2

need to get some for a 2nd grade science project

2007-01-20 06:34:06 · 8 answers · asked by Anonymous

2007-01-20 06:26:42 · 1 answers · asked by stardust6547 2

The chemical reaction must be something that would occur around the house. For example, I could not just mix a random acid and a random base together for the reaction.

2007-01-20 06:16:48 · 7 answers · asked by mvnn 1

2007-01-20 05:59:11 · 5 answers · asked by stardust6547 2

Calculate the freezing point of 0.4 molal of MgCl2?

2007-01-20 05:56:38 · 2 answers · asked by ryang024 1

What makes lemons good as bleaching agents?

2007-01-20 05:16:51 · 1 answers · asked by Anonymous

2007-01-20 05:05:01 · 1 answers · asked by free2organic 1

What temperature does CO2 freeze? You dont have to give excact but just around it (this is so i can make dry ice)

2007-01-20 04:44:01 · 3 answers · asked by Anonymous

2007-01-20 04:34:17 · 6 answers · asked by ♫ Music is Love ♥ 6

How do you make dry ice (not using labratory chemicals, or talking science, just plain home mad ingrediants to make dry ice)? I need to know bc i have a science project!

2007-01-20 04:26:10 · 7 answers · asked by Anonymous