Chemistry - December 2006

2006-12-26 21:28:29 · 3 answers · asked by Anonymous

I've been purifying adulterated silver that consists of 75% silver and remaining 25% includes copper, zinc, gold etc, using acids and now I would like to do the same in an easy way. If there is somebody to guide me to do the same using electrolysis method kindly guide me.

2006-12-26 21:20:14 · 2 answers · asked by Anonymous

2006-12-26 19:29:49 · 8 answers · asked by omoh 1

i am getting test?

2006-12-26 18:09:53 · 10 answers · asked by Anonymous

What kind of enviorments do toxologists mostly work in?

2006-12-26 17:08:28 · 2 answers · asked by S 3

2006-12-26 15:34:12 · 14 answers · asked by JJ 2

The colder the liquid the more dissolved gas that should be held in solution but very cold ice, that is not wet on the surface, releases copius quantities of CO2. Wetting the ice beforehand reduces the effect.

2006-12-26 14:47:17 · 4 answers · asked by J. M. K 1

2006-12-26 14:10:11 · 9 answers · asked by Anonymous

2006-12-26 13:49:30 · 3 answers · asked by Misty 1

The Amazing Hot Heart Massager is a gel-filled, heart shaped pack used to give massages. There is a small metal disk floating in the gel, when you bend the disk, it snaps and the gel around the disk quickly heats up, turns to a crystalised material, and the heat quickly spreads through out the whole gel pack.
It stays hot for about an hour, then gets kind of hard. To reset it, you drop the pack into a pot of boiling water for 10 minutes. I'm sure there's some sort of scientific explanation of it, I hope someone knows what I'm talking about and can tell me how it works.

2006-12-26 13:22:03 · 0 answers · asked by zimani08 2

2006-12-26 11:34:13 · 3 answers · asked by Ashley I 1

13. When healed, mercury(II) oxide, HgO, decomposes to form mercury and oxygen. Through this reaction, Joseph Priestley demonstrated the existence of oxygen in 1774. Write balanced equation for decomposition of mercury(II) oxide.
14. Methanol, CH3 OH, decomposes to form carbon monoxide, CO, & hydrogen gas, H2. Write balanced equation for this decomposition reaction.

::Write the balanced chemical equation &Identify type of reaction::
15. sulfur + oxygen >>>> sulfur dioxide (g)
16. zinc + sulfuric acid (H2S04) >>>> zinc sulfate (aq) + hydrogen (g)
17. hydrogen + nitrogen >>>> ammonia (g)
18. hydrogen + chlorine >>>> hydrogen chloride (g)
19. carbon + water(steam) >>>> carbon monoxide (g) + hydrogen (g)
20. calcium oxide + water >>>> calcium hydroxide (aq)
21. phosphorus + oxygen >>>> diphosphorus pentoxide (molecular formula, P4O10) (s)
22. hydrochloric acid(HCl) + sodium hydroxide >>>> sodium chloride (aq) + water

2006-12-26 10:23:45 · 4 answers · asked by truckin_90 2

what happens if i boil it on the oven since it really flamable but i have to boil it for a project im doing what sould i do



science&mathematics

2006-12-26 09:23:14 · 5 answers · asked by ♫ 2

2006-12-26 08:06:08 · 2 answers · asked by mitchellvii 2

2006-12-26 07:55:40 · 5 answers · asked by kverch123 1

Hey, I am doing a chemistry project on corrosion removal. Most of the metals I am working with are iron and aluminum. I am wondering if anyone knows specific materials, acids, or if anyone has any information that could help me conduct experiments to remove corrosion. Also I would appreciate it if someone would be able to find corrosion removal corporations that I could email for help as well....thanx

2006-12-26 06:44:26 · 5 answers · asked by goingcrazyoverhere 2

2006-12-26 04:43:35 · 1 answers · asked by alma a 1

3. What is the mass of one (1) mole of carbon dioxide, CO2?
4. What is the mass of one (1) mole of sulfuric acid, H2SO4?

Find the number of moles in each quantity
5) 3.00 g H2SO4
6) 12.0 CH4
7) 3.40 X 10-1 g CaO
8) 13.4 g SO2

Find the mass of each substance

9) 0.369 mol N2
10) 10.0 mol Ca(NO3)2
11) 1.94 x 10-3mol C6H12O6
12) 0.0112 mol KCl


Convert between moles and particles. Particles can be atoms, ions, or molecules.
Calculate how many particles are in the following and place the answers in the work
assignment. Don't forget to use Avogadro's number!
13) 25.9 mol Fe
14) 0.30 mol NaCl 2

Calculate the number of moles in each of the following and place the answers in the work
assignment.
15) 47 x 1023 atoms Cu 1
6) 8.30 x 1025 molecules H2O



I dont understand these I have plenty more to do but I jus need help with these for right now can someone help me with a few?

2006-12-26 04:28:40 · 7 answers · asked by queenpravato 1

i need to write a chemistry on the theme "safety in the lab" and i really need help.....i need to know which chemicals are dangerous, wat are the consequences, how to store those chemicals and work withe them, the first aid when someone gets hurt (include: bases ,acids, salts, gasses, metals.....)

please help me, give some links and thanks

2006-12-26 04:27:03 · 3 answers · asked by CosmicLove 5

2006-12-26 04:25:58 · 2 answers · asked by John C 1

I would like to be able to separate water into oxygen and hydrogen (hydrolysis), then collect the oxygen and hydrogen for combustion and reconstitution into water. I would like to use a catalyst to lower the amount of energy needed to separate the components. Anyone help?

2006-12-26 04:04:30 · 5 answers · asked by buffed_n_shy 1

2006-12-26 04:00:37 · 7 answers · asked by just4fun f 1

Complete the balanced reaction if it will occur.
State "does not occur" if the reaction will not take place.

Na + HNO3 --->

Ni(II) + Cu2O -->

Zn + Mg(NO3)2 -->

2006-12-26 03:59:08 · 3 answers · asked by queenpravato 1

2006-12-26 03:37:27 · 5 answers · asked by Kate K 1

2006-12-26 02:33:39 · 8 answers · asked by mittu_batura 1

Fe + Cl2 ----> ?
Fe + HCl ----> ?

2006-12-26 01:52:59 · 6 answers · asked by tomi 1

pls explain clearly.

2006-12-26 01:13:42 · 5 answers · asked by poornima_durairaj 2

2006-12-26 00:57:39 · 5 answers · asked by juniorramos1974 3

2006-12-26 00:31:54 · 5 answers · asked by samina k 1

2006-12-25 23:46:45 · 15 answers · asked by lulu 2