October 2011 - Chemistry

VouloirPouvoir
Sun, 02 Oct 2011 12:23:44 +0000

@Questions96: Yes, I believe you are correct. I put the density would decrease because I wasn’t thinking right. Once the solution has reached saturation, it has reached maximum density.

@hhhenry: Separation of iron filings, sand, and KI was (I think) water extraction because KI is an aqueous in solution. At first I thought that KI being aqueous would disqualify water extraction but I couldn’t think of any better method (other than sieve, so I’m still not sure).

@infrapr0ds: I don’t quite remember that question. Though CO2 does form a weak acid (carbonic acid) in solution, it is not a polar covalent molecule. It has polar bonds but its electron geometry is linear and the dipoles cancel out.

Edit: Oh, the answer was CH4. Also, iron oxide is reduced to iron and carbon is oxidized to carbon dioxide.