Hello. I'm new at here...
A question need help. I just move to Australia. N i had picked the subject of chemistry. Is quite hard for me.
Em.... my question is, can u guys teach me tat how to done the chemical equation correctly? Know wat i means?
For example, Aluminium + oxygen = aluminium oxide. Y the equation of it become 4Al + 3O2 = 2AL2O3.
Y will get 4 for aluminium?
My english not very good,.... Can someone use some simply english explain to me ???
Please... Thanks...

SovhiaWong

I am learning, on my own, with the help of textbooks kindly given to me at Christmas by my grandfather and my own experimenting, some more advanced chemistry than what I studied in Grade Seven. Partly as preparation for High School, and partly for my own knowledge. However, I ran across some reactions that need clarifying.

Through frequent observation, I noticed that HCl likes to form chlorides. So is this equation correct?

CuSO4 + 2HCl --> CuCl2 + H2SO4

Although I found it unlikely that it would form sulphuric acid, I could not find another spot to put the SO4, which I know cannot exist as a free compound.

Are there any good chemistry books or e-books that are good to get the basics (chemical bonding, etc.)? And are there good books or e-books that have good experiments, which require not that many chemicals and apparatus? (I have test tubes, flasks, H2SO4, sodium carbonate, copper sulphate, calcium carbonate, sodium hydroxide, and other similar chemicals.)

Hi, I have a problem.I have a project from chemistry and I need to write 15 pages about allotrophic modifications of phosphorous, but I cannot find that much stuff about it.Can anyone give me some clues on where to look for, or some sites?I need some more info on red and black phosphorous and something about the structure of white and red phosphorous.
THANK YOU VERY MUCH!

Heh..
Where is here some web gallery about site creators?
I'm need it.

For example, as here - Google, I'm really have seen it
here.

Good luck!

Is fantastic, this software is free to download in the next link: http://geocities.com/ciericorp/quimica.htm

Is very useful

Why does akyl-groups direct more towards ortho than para?

And also why does halogens direct more towards para than ortho?

Hello, first post here. :)

Anyway, I'm very confused by the concept of solubility.

I realize that the solute is what GETS dissolved, and the solvent is WHAT dissolves, but the concept of a 'solution' doesn't really make sense to me. Why is it a solution and not just a mixture? Is there something unique about it? (is it that it's just a homogenous mixture?)

What role does entropy play in solubility?

What is solubility? :? :(

I also don't get how something can be miscible. How can something be a solvent and a solute if miscible substances 'are soluble in one another'?

what is the volume of the unit cell of boron?

I understand that as you make a semiconctor smaller, to the quantum dot size, you can control the size of its band gap, and this is due to the fact the material is now a smaller size than the electrons ideal Exciton Bohr Radius. So if you add more atoms (and therefore electrons) the particle size increases and the band gap will get larger as it "wants" to be closer to the Exciton Bohr Radius, and if you make the particle smaller the band gap has to get smaller. I think that that bit is right.

My question is that does this mean that in a bulk material the band gap is the same size as the Exciton Bohr Radius, and is the exciton Bohr Radius different for different materials (I guess it must be) and what determine the size of this radius in a bulk material.