Chemistry - January 2007

2007-01-24 03:08:38 · 1 answers · asked by Anonymous

Heavy water is water that has an additonal nutron. It is used in nucular reactors.

2007-01-24 03:02:19 · 5 answers · asked by Olly 1

2007-01-24 02:57:09 · 9 answers · asked by Anonymous

How much energy would it take to remove an electron from a sodium atom?

2007-01-24 02:40:17 · 4 answers · asked by Anonymous

2007-01-24 02:33:28 · 8 answers · asked by confused21 2

does it have any relation with hypoxia encountered in high altitudes?

2007-01-24 02:25:12 · 1 answers · asked by VIJAYEVARSHCINI D 1

Any help would be awesome. Thanks.

2007-01-24 02:23:22 · 2 answers · asked by AppleCard! 2

What does ionization energy measure? What units are used to measure ionization energy?

2007-01-24 02:11:55 · 4 answers · asked by Anonymous

2007-01-24 02:08:35 · 4 answers · asked by Me 1

What does the atomic radius tell us about the atom?
Why is the picometer used to measure the radius of an atom?
Why not use a micrometer or a femtometer?

2007-01-24 02:03:30 · 2 answers · asked by Robert d 1

2007-01-24 01:54:54 · 5 answers · asked by flyressa 3

A molecule has 40 carbons. All of these have sp2 or sp3 hybridization. If you have 6 double bonds and 5 rings, how many hydrogens will you have?

2007-01-24 01:44:38 · 1 answers · asked by da_bigunit 1

2007-01-24 01:32:08 · 4 answers · asked by bnj 3

2007-01-24 01:16:16 · 1 answers · asked by brian s 2

2007-01-24 01:14:41 · 2 answers · asked by X&Y 1

2007-01-24 00:53:16 · 3 answers · asked by X&Y 1

A tank containing 5 kg of H20 at 90 celcius cools down to 20 celcius. How much heat does the water loose?

2007-01-24 00:18:37 · 4 answers · asked by Anonymous

2007-01-24 00:14:39 · 19 answers · asked by Anonymous

A 29.0 g Ag combine completely with 4.30 g S to form a compound. What is the % composition of this compound?

2007-01-24 00:04:30 · 4 answers · asked by Anonymous

2007-01-24 00:00:59 · 2 answers · asked by Anonymous

2007-01-23 23:56:12 · 4 answers · asked by Anonymous

I am in the final year, and the deadline for my chemistry project is just a few days away. I need some Uranium to complete the experiment, but the school does not seem to have any anymore. I just a small quantity, to test on the isotopes. I am in Santa Clara, CA now. Can anyone please help?

2007-01-23 23:22:52 · 6 answers · asked by Anonymous

Some chemistry teachers ask students to remember, in order, the elements of the periodic table. What's the point of this? Isn't the periodic table supposed to be used as a reference to look up things if you forget?

For all you chemists; is it really that useful to "remember" the periodic table?

2007-01-23 23:06:35 · 8 answers · asked by robbob 5

2007-01-23 22:47:08 · 3 answers · asked by zeshah 1

Pls give each its chemical structure, allowable dose or amount, uses in foods and its health risks.

2007-01-23 21:56:18 · 1 answers · asked by Mica K 2

Does anyone know what this is? I have for a homework question, got to draw the dot and cross diagram for it, then draw it's shape and state the bond angle. I've searched for it but it doesn't appear to exist

Any ideas?

2007-01-23 21:47:25 · 7 answers · asked by yummygummybear2006 1

2007-01-23 21:17:44 · 2 answers · asked by curiouscrew 2

what are nanocrystalline materials and its mechanical, chemical, magnetic properties. how the characteristics differ with other conventional materials.Eneergy band gap of nano material.explain different synthesing methods of nanocrystalline material. electrodeposition of nanocrystalline materials.

2007-01-23 21:04:40 · 1 answers · asked by buvi k 1

2007-01-23 19:49:38 · 6 answers · asked by lizashibuya 1

my friends im 17 yrs i didint studied High school and i jumped to college the reason is because im too old to study high school form1 and when i was young i use to hate school so ididnt used to go and my family didnt used to push me, i know thats A big fault

so now i study in college BioChem Section im really doing good but i have problem in chemistry, the problem is that i havent studied about elements so when it comes to blancing or equations i have difficult to know in which group is the element what is its charesteristic and its valency so i cant answer them in exams or i cant do any balancing question in exams

So how can i learn and remember fast about elements in preodic table and their valencies and how can i do that while im studing and doing other home works

is there any easy or shorcut way that i can build up high school chemistry, is there any good softwares or websites



thanks alot please help me

2007-01-23 19:18:44 · 4 answers · asked by loveyou_yahoo 1