Chemistry - December 2006

I'm going to need help with moles,blance equations & I need someone to help me so I was wondering if someone will be greatful to help me. If you will help me let me know and I'll post the problems up.

2006-12-28 02:47:41 · 2 answers · asked by Anonymous

2006-12-28 02:35:19 · 6 answers · asked by dev m 2

then why does water become hot when u dissolve NaOH in it and cold when u dissolve urea or NH4CL {ammonium chloride} in it

2006-12-28 02:15:40 · 3 answers · asked by lets rock 2

2006-12-28 01:35:27 · 5 answers · asked by Dhiman B 2

to seperate salt from a salt solution .some of the mixture was placed on a petri dish and left for 24 hrs.what results do i get?

2006-12-28 01:35:22 · 1 answers · asked by virgoqueen 1

2006-12-28 01:22:29 · 6 answers · asked by Anonymous

its yogesh from ahmednagar

2006-12-28 01:11:26 · 5 answers · asked by yogi j 1

2006-12-28 01:02:58 · 1 answers · asked by 'd campus Hearthrob 1

2006-12-28 00:44:09 · 2 answers · asked by blueszz 1

2006-12-28 00:42:23 · 3 answers · asked by tintin 1

2006-12-28 00:39:06 · 4 answers · asked by Anonymous

When water molecules form hydrogen bonds, when condensing from water vapour to liquid water for example, they give up energy in an exothermic reaction. What exactly is it about the molecules that is the cause of the energy release? Is it a change in the electrons bound to the hydrogen and oxygen atoms that are involved in the bonds? Do they jump to lower energy levels and give off energy as photons? Or is it another mechanism?

2006-12-27 22:29:15 · 5 answers · asked by kooky45 1

2006-12-27 22:05:15 · 3 answers · asked by Balaboo 5

And what's the name for C4H10 in English?
In my native language it's butan.
I've seen only two products in my book ,but I think there are a lot more in practice.

2006-12-27 21:49:39 · 3 answers · asked by Anonymous

2006-12-27 21:20:29 · 14 answers · asked by Ryan 2

2006-12-27 20:47:43 · 4 answers · asked by sweetgurl_16 1

thermodynamics

2006-12-27 20:43:24 · 8 answers · asked by prbakaran l 1

For instance in a lump of copper can it be said that the material comprises copper ions or copper atoms? Any help appreciated.

2006-12-27 19:16:45 · 4 answers · asked by Gideon 1

2006-12-27 18:37:28 · 13 answers · asked by rupali 1

yes,chem sensor

2006-12-27 18:31:14 · 5 answers · asked by aditya 1

10. d

The 1st ionization enery for Mg is 738 kilojoules per mole and that Al is 578 kilojoules per more ?
account for this difference

2006-12-27 17:16:00 · 2 answers · asked by chanti 3

I'm a junior in high school, and I have started to think about what I should become in the future. Also, I'm starting to look into different colleges and majors. First of all, I want to say that I LOVE chemistry. period. I can't really point out which part of it I like, but I like it better than biology and physics. I am so confused on what major I would like to do at college. I was considering Pharmacy, but it seemed like Chemical Engineering would be so much more fun. I know that both will lead to high-salary careers, which is somewhat important to me. I know money should not be a key deciding factor, but I might as well choose a chemistry-major that leads to high-salary careers. Which major/career would be more fun and has more room for advancement? Are there other majors/careers I should consider? Also, is the workload for Chemical Engineering as bad as other people on this site have said to be?

2006-12-27 17:02:10 · 5 answers · asked by feelthebass10 1

a) explain the difference between Ca and K in regard to
i) their first ionization energies
ii) their second ionization energies


K: 1st ionization energy =419 2nd: 3050
Ca: 1st ion. enery = 590 2nd: 1140

2006-12-27 17:02:04 · 3 answers · asked by chanti 3

2006-12-27 16:58:08 · 12 answers · asked by david b 1

I think it might be polar, since it pulls dirt molecules away from stuff, but I'm not very sure.

2006-12-27 16:49:44 · 5 answers · asked by Anonymous

Account for the existence of several series of lines in the spectrum.

2006-12-27 16:44:57 · 2 answers · asked by chanti 3

chemistry help!

2006-12-27 16:10:10 · 6 answers · asked by Anonymous

If you take a lump of copper for example is it made up of ions or electrons?

2006-12-27 15:28:11 · 2 answers · asked by Gideon 1

2006-12-27 14:54:44 · 6 answers · asked by ashamarika 1

Please identify wether it is a physical or a chemical change and specify if itis an exothermic or endothermic change..
Explain if necessary.

1.When a grain of table salt is placed in a 5mL of 0.1M silver nitrate solution.
2. A 0.5g of table salt in 5mL of water in a test tube.
3 Evaporation of acetone in a watch glass.
4.Combustion of acetone.
5. Strongly heated sugar.
6. Heated few grains of clean sand.
7. Aluminum dissolved in the acid and gave off Hydrogen gas.
8. Ammonium chloride dissolved in water and evaporated to dryness.

Thankyou very much!

2006-12-27 14:41:52 · 4 answers · asked by jann kyle_upvcc 1