Chemistry - September 2006

1. An object weighs 45g its denisty is 12.9g/cm. When measured its height is 7.43 cm and width is 3.45. How long is the object?

2. Solid sodium chloride has a denisty of 2.16g/cm/ A chemist needs 56.1 mL of sodium chloride. How many grams should the chemist use?

2006-09-24 08:03:50 · 3 answers · asked by Anonymous

2006-09-24 07:42:05 · 4 answers · asked by obinna p 1

2006-09-24 07:39:41 · 3 answers · asked by obinna p 1

2006-09-24 07:39:37 · 5 answers · asked by Anonymous

I also need the number of electrons that are transferred in the overall electrochemical reaction.

2006-09-24 07:22:59 · 4 answers · asked by ChaseMakesMeSmile 2

2006-09-24 07:16:33 · 7 answers · asked by Anonymous

2006-09-24 06:40:57 · 2 answers · asked by marina o 1

I have some questions to answer about it for school, and I found some of them, but there are two that I can't find in my notes or text books. Could you please help me?
-A few alpha particles were deflected. What does this evidence suggest about the structure of gold atoms?
-How should the original model be revised based on the results of this experiment?
Any help is appreciated!!

2006-09-24 06:39:00 · 4 answers · asked by um yea hi 4

I need to know this for school work. I wrote 'Atoms must absorb energy to become excited. They can't remain in the excited state, so they immediatley return to the ground state. When they do this, they emit energy as light.', but I didn't mention anything about energy transitions. is this answer correct or not? Can you help me please?

2006-09-24 06:34:23 · 4 answers · asked by um yea hi 4

I need to know for homework, and I can't find the answer anywhere. Please help.

2006-09-24 06:28:40 · 1 answers · asked by um yea hi 4

2006-09-24 06:15:30 · 11 answers · asked by alix xx 1

2006-09-24 06:05:14 · 1 answers · asked by K(old man) 2

I'm converting the book into a game, and this part doesn't seem to make sense. Jean Valjean makes his fortune by finding a cheaper way to make the wax used in making jewelry,. He says "The wax was formerly made with resin and lampblack [soot], and cost four livres the pound. I invented a way of making it with gum shellac and turpentine. It does not cost more than thirty sous [less than two livres], and is much better." Turpentine is made from resin, so surely should be just as expensive? And shellac comes from an Asian beetle, so how is that cheaper than soot? Thanks in advance for any light you can shed on the matter.

2006-09-24 05:53:26 · 1 answers · asked by Chris T 1

2006-09-24 05:40:16 · 5 answers · asked by ~ 1

how do you go from 3.90X10^24 atoms of sn to grams of sn?

2006-09-24 05:34:05 · 3 answers · asked by ~ 1

2006-09-24 05:33:45 · 11 answers · asked by Arjit K 1

2006-09-24 05:31:17 · 4 answers · asked by ~ 1

4 or 5 dictinct items that remain seperated afte shaking

2006-09-24 04:09:46 · 6 answers · asked by Anonymous

2006-09-24 03:29:39 · 24 answers · asked by drfcdean 1

plz help me?is it a physical change or a chemical
'

2006-09-24 03:18:57 · 10 answers · asked by sana_ahmad75 1

2006-09-24 02:33:00 · 6 answers · asked by jhaziel o 1

2006-09-24 02:32:01 · 3 answers · asked by jhaziel o 1

2006-09-24 02:30:18 · 4 answers · asked by jhaziel o 1

2006-09-24 02:16:32 · 4 answers · asked by Anonymous

Only for those interested...

2006-09-24 02:02:46 · 5 answers · asked by jarynth2 2

2006-09-24 01:20:41 · 4 answers · asked by Anonymous

plz help immediatly i am desprate

2006-09-24 01:06:32 · 3 answers · asked by azi 2

2006-09-23 23:15:47 · 17 answers · asked by Sting Ray 1

2006-09-23 22:29:57 · 5 answers · asked by Anonymous

what are the different processes that take place in a mass spectrometer?

2006-09-23 22:20:03 · 3 answers · asked by angela s 2