Chemistry - January 2007

2007-01-22 02:47:20 · 2 answers · asked by Lai Yu Zeng 4

2007-01-22 02:46:27 · 1 answers · asked by Lai Yu Zeng 4

2007-01-22 02:29:14 · 5 answers · asked by Anonymous

2007-01-22 02:24:22 · 2 answers · asked by aly 1

2007-01-22 01:59:52 · 8 answers · asked by William 1

2007-01-22 01:51:59 · 7 answers · asked by basempales 1

2007-01-22 01:38:28 · 2 answers · asked by Anonymous

2007-01-22 01:33:18 · 5 answers · asked by suziebadr 1

(1) Distinguish between a strong and weak electrolyte with reference to the degree of dissociation into ions. (2) What makes an electrolyte an electric current conductor when in a solution? Thank you.

2007-01-22 01:26:41 · 4 answers · asked by -three31one- 1

2007-01-22 01:24:39 · 1 answers · asked by Anonymous

Any good household mixtures that causes good explosions like potassium and water, or alcohol and chlorine, or mentos and diet coke, or vinegar and baking soda? (don't metion any dry ice bombs, i know all of those)

2007-01-22 00:59:31 · 14 answers · asked by Anonymous

which would u expect to experience a greater effective nuclear charge , a 2p electron of an Ne atom or a 3s electron of an Na atom?why?

2007-01-22 00:58:12 · 1 answers · asked by shuyi 1

at room temperature, chlorine is a gas, bromine is a liquid and iodine is a solid. Explain in terms of intermolecular bonding?

2007-01-22 00:38:09 · 5 answers · asked by helenlouisewelsby 1

Give two uses for each of these and in each case explain how structure and bonding makes it suitable for the application.

Also does anyone know why ice is less dense than water? Is it because of all the crystals that form?

2007-01-22 00:33:30 · 9 answers · asked by helenlouisewelsby 1

For example:Na
Zeff = Z-S=11-10=1
Valence eletron is also 1
So what's the difference

2007-01-22 00:32:36 · 2 answers · asked by shuyi 1

Gold can be hammered into extremely small sheets called gold leaf. If a 200-mg piece of gold (density = 19.32g/cm cubed) is hammered into a sheet measuring 2.4 x 1.0 ft, what is the average thickness of the sheet in meters? How might the thickness be expressed without exponential notation, using an appropriate metric prefix?

2007-01-22 00:30:58 · 3 answers · asked by nicki s 1

Account for the fact that hydrogen flouride and ammonia can only form on average one hydrogen bond per molecule but water can form two. How does this fact lead to an explanation of the structure of ice?

OMG I'm only a first year lol I have no idea :'( Are there any Chemistry tutors out there??

2007-01-22 00:03:36 · 5 answers · asked by Anonymous

Single crystals of metals will conduct electricity equally well in all directions but a single crystal of graphite will only conduct in one direction. Could anyone suggest a possible explanation for this in terms of the structures of the materials?

Thank you

2007-01-21 23:57:16 · 3 answers · asked by yummygummybear2006 1

1)Benzene and ethylbenzene
2) 1-butyne and 2-butyne
3) 2-methylpentane and 2-methyl-2-pentane
4)toluene and 1-methylcyclohexane

Also, can you show me the equations?

2007-01-21 23:51:29 · 5 answers · asked by athame 3

When a tap ater is boiled, will its hardness increase or decrease? Is it permanent or just temporary? Can I get your explanations? Sources please...

2007-01-21 23:45:32 · 9 answers · asked by Anonymous

detailed discussion of the topic "atomic structure", with some pictures attached on it.

2007-01-21 23:44:28 · 3 answers · asked by mitch 1

2007-01-21 23:41:32 · 4 answers · asked by leann_hp28 2

can you give me the equations of
(a) blue vitriol exposed to the atmosphere
(b) anhydrous calcium chloride exposed to the atmosphere
(c) Glauber's salt exposed to the atmosphere

these three are hydratse, what can you say about the behavior of these when exposed to the air?

Help me..

2007-01-21 23:38:30 · 5 answers · asked by Anonymous

I am interested in small scale hydrogen and oxygen production systems.

2007-01-21 23:28:58 · 4 answers · asked by Robert J 1

i always get marks that i don't expect from myself in chemistry , i study all reactions dedfinations all my lessons, writing it .i understand my lessons also but there's something wrong .please help?

2007-01-21 23:25:19 · 5 answers · asked by dew m 2

how does chemistry becomes essential to our eternal struggle for survival, freedom from toil, and for comfort? how essential chemistry is in all of the human needs: food, energy, materials, health, products, that raise the quality of life, and economic vitality?

2007-01-21 23:23:30 · 2 answers · asked by mitch 1

Is wax vaporising a chemical or physical reaction?

2007-01-21 22:50:54 · 6 answers · asked by lalala 2

in semi micro qualitative analysis

2007-01-21 21:51:28 · 1 answers · asked by keeru 1

I was just wondering, I have no scientific background so I have no clue if I'm sounding mentally handicapped right now haha, If you could find something like buckyballs or carbon nanotubes or something like that, but was smaller and when condensed could be smaller than oxygen but still dense enough to not rise? Tell me what you think.

2007-01-21 21:23:25 · 2 answers · asked by Nick 2

scientifically, when you burn and/or melt a sugar cube?

2007-01-21 21:21:41 · 4 answers · asked by rosecrashers1365 2