Chemistry - September 2007

How does the behaviour of real gases deviate from that of ideal gas and give two properties of real gases for which van der waal's equation attempts to compensate,stating which term in the equation is responsible for the compensation.

2007-09-03 02:53:04 · 3 answers · asked by Emperor 3

at what temperature does the numerical reading on a celsius thermometer equal that on a Farenhiet thermometer?

2007-09-03 02:25:02 · 8 answers · asked by tmac5445 1

Please give me three reactions and the delta H of each...
or better yet please write out the steps of Hess's law...

2007-09-03 02:14:52 · 1 answers · asked by Anonymous

I took Chemistry about a year ago. I reviewing some topics for AP Chem, but have forgotten some things like ionic charge. For example:

If you use http://www.webelements.com/ as a guide, I know that Group 1 will a charge of +1, Group 2 would be +2, Group 13 would be +3, Group 15 would be -3, Group 16 would be -2, and Group 17 would be -1.

What would Group 14 be and is there a way to determine the charge in Groups 3 to 12, such as Ag (Silver).

I love Chemistry, but man I forgot so much stuff!!

2007-09-03 00:48:13 · 2 answers · asked by Fred 2

1- sodium + water ----> sodium hydroxide + hydrogen
2- Magnesium + steam ----> magnesium oxide + hydrogen
3- Hydrogen + mitrogen ----> ammonia
4- Magnesium + carbon dioxide ---> magnesium oxide+carbon

2007-09-03 00:03:01 · 5 answers · asked by Roller 2

2007-09-02 23:38:29 · 4 answers · asked by dvd_digitaltech 1

2007-09-02 19:29:23 · 5 answers · asked by nxml81 1

2007-09-02 19:21:27 · 3 answers · asked by harPOON capt uss TANG 2

okay so i have to enter this online and i have no idea what it wants me to put. the question is:

What conversion factor could be used to determine how many pounds of apples could be bought for $8.00 if one pound of apples costs $0.79?

i tried entering lbs/dollars but it said it wasnt right

2007-09-02 17:45:22 · 1 answers · asked by red_bullgivesyouwings 2

Chloroquine is used to treat malaria. Studies have shown that an effective dose for children is 3.5 mg per kilogram (3.5 mg/kg) of body weight, every 6 hours. If a child weighs 31 kg, how many milligrams of this drug should be given in a 36 hour period?

2007-09-02 17:42:33 · 4 answers · asked by Anonymous

I know 1 cm3 of water = 1 mL, but it is true for everything else right? I need 15 g KNO3 but don't have a good scale, and I'm trying to find the volume of 15 g.

2007-09-02 17:39:20 · 3 answers · asked by dustdevil_333 2

Give me a simple answer to say to my teacher.

(Dam things so annoying!)

2007-09-02 17:32:27 · 7 answers · asked by Moriarti 2

Plz explain in a way comprehendable by a student who has never gone through a rigorous definition of the same. I've gone through some Organic Chemistry books (& some Physics books too), but they are not at all satisfactory to even understand the basic concepts associated. I've also searched in some search engines, but to no avail - they are either wayward, or of a much higher level, not discussing about the basics involved. Also, is there any other form of polarized light? Plz explain. Thanks!

2007-09-02 17:22:09 · 7 answers · asked by Kristada 2

I would like to know how do you calculate the rate constant from a graph that yields a zero order. The graph is linear of course to have a zero order. I need to calculate the rate constant from a graph Concentration vs. Time data. I do not know which number to choose to place in the first order equation. Would I be able to choice the inital concentration and the inital time to find the constant? Please help if possible.

2007-09-02 17:07:19 · 4 answers · asked by Anonymous

2007-09-02 17:00:24 · 9 answers · asked by B9O9R9I9C9U9A 3

my chemistry teacher said it has something to do with raising the boiling temperature but my friend says it is to prevent the pasta from sticking. but how useful is it to have hotter water and it seems like the oil would be forpreventing stickage. Besides, just stirring a couple times does this without the use of salt or oil!

2007-09-02 16:59:48 · 28 answers · asked by riverspecialist 1

What evidence indicates the silver compounds are light-sensitive if you absorb the mixture of AgNO(sub)3 + NH(sub)3 on a scrap of paper and observe?

2007-09-02 16:42:08 · 1 answers · asked by D-Unit 3

A 4.00 L sample of gas at 250 degrees celsius and 0.790 atm condenses to give 1.20 mL of liquid; 600 J of heat is released during the process. What is the enthalpy of vaporization of the compound? I'm not sure how to approach this problem because volume is given in it and I don't know if there is a certain equation I should use. Showing the steps on how to solve this problem would greatly be appreciated, Thank You.

2007-09-02 16:05:05 · 1 answers · asked by me of course 2

Chemistry lab question

2007-09-02 15:07:28 · 3 answers · asked by Tonnie 1

Lead Filings and Iron filings
Sand and Gravel
Sand and Fine Styrofoam
Alcohol and Water
Nitrogen and Oxygen

2007-09-02 10:47:56 · 5 answers · asked by INTOTEHasdffff 2

2007-09-02 07:53:00 · 5 answers · asked by ahmedsyed2 1

The Speed of light in a vacuum is 186,000 miles/second. How many meter/hour is this equivalent to? This is a chemistry problem that I have...I have many more...so if you can explain to me better than my professor can...please, please, get back to me.

2007-09-02 06:51:16 · 6 answers · asked by Anonymous

A L of water at 25 C dissolves 0.0404 g O2 when the partial pressure of O2 is 1.00 atm. Whar is the solubility of O2 from air, in which the partial pressure of O2 is 159 mmHg?

All calculations aside, I got it right: 8.5x10^-3 g O2/L
BUT my book says that the answer is 8.45x10^-3 g O2/L

I don't have any review in this book about significant figures but from what I've found on the internet, when you multiply or divide, you use the smallest number in the problem to determine the nimber of significant figures. So when the smallest number is 25, is the answer 8.5..... or 8.45......?

2007-09-02 06:30:44 · 4 answers · asked by ecodiva 2

Cinnamic acid contains only carbon, hydrogen and oxygen, and is found by analysis to be 73% carbon and 5.4% hydrogen. In a titration, 18.02 ml of .135M NaOH is found to neutralize .3602 grams of cinnamic acid

Find the emprirical formula of Cinnamic acid
Find the molar mass of Cinnamic acid
Write the molecular formula of Cinnamic acid

2007-09-02 06:11:12 · 5 answers · asked by dylson20 1

I'm stuck on this question for my biology project...

2007-09-02 05:39:11 · 6 answers · asked by Leila 1

it must be more than 10 sentences

2007-09-02 03:32:45 · 1 answers · asked by mark b 1

chemistry

2007-09-02 02:54:42 · 11 answers · asked by Marcial M 1

a bicycle made from steel kept:
a:indoors
b:outdoors exposed to the weather & next to the sea
c:outdoors but sheltered
d:outdoors exposed to the weather

2007-09-02 01:47:12 · 1 answers · asked by Ms Fabregas 1

what is the structural formula of diethyl ketone, methyl ethyl ketone, acetaldehyde, methyl phenyl ketone?

2007-09-01 21:41:54 · 3 answers · asked by honey_106 2

2007-09-01 21:39:13 · 5 answers · asked by honey_106 2