I've recently been doing micro and macrostructures. This seems a little ignorant of me but I understand that you can divide all substances up into crystalline, polycrystalline and amorphous structures. How would you describe Aerogel? What is it's structure like and how does that determine its extraordinary properties. I've only just started college so be detailed but nothing so technical that I won't understand please.

Thanks for any help or advice, Andrew Sellick

Alright so I have a quiz on stoichiometry tomorrow and I am completely lost.. I would really appreciate some help. Thanks

Here are the problems:

How many moles of sodium will react with water to produce 4.0 mol of hydrogen in the following reaction
____Na(s)+____H20(l)--->____NaOH(aq)+____H2(g)

Known:
Unknown: What type of problem is this? mole to mole??

How many grams of lithium chloride will be formed by the reaction of chlorine with 0.046 mol of lithium bromide in the following reaction.
2LiBr(aq)+ ____Cl2--->2LiCl(aq)+___Br2(l)
Known:

Can anyone give me a clue how to solve this pbm? I have a soln of formic acid with pH of 2.53. How many grams are the in a 100 mL soln. Ka= 1.8*10^-4. Any help would be appriciated!

So like I totally need like super trooper help, becuz like I'm doin this chem like i think thingy on those pretty cute little corled light things in the sky.
I think It's in like Peru, but I'm not sure. So your girl need some help ASAP. BTW, its due Friday.
Oh yeah its a school project, and I need an A or im like totally gonna fail. (Can you beleve that) (me fail.) (EWW.)

Karen <3

I want to ask what is the relation between "electronegativity(EN)", "polarizability", "polarizable" ? are the applications of these terms restrict solely to covalent bonds or solely to ionic bond? or is it just free for us to apply them to whatever kind of bond?

besides, in the comparison between CBr4 and CCl4's boiling point, why don't we refer to the difference in EN but say that Br is more polarizable so it has a stonger intermolecular force and higher b.p.?

in case of comparing HBr, HCl's boiling point, what should we use to explain? EN or "more polarizable" or something else?

My question is "A mole of pop cans stacked on top of one another would reach from here to the sun and back how many times"

I know the average distance between the earth and the sun is 4,525,984,251,973.392 inches. I also know that the height of a pop can is about 4.75 inches. I know that a mole of pop cans is 2.86 x 10^24 (using significant figures). I do not know what to do next!!! can someone please help me with my dilema!

Give the expected hybridization of the central atom for the following molecules or ions.

(a) SO2
(b) PCl2-
(c) SO32-
(d) POCl3
(e) XeO4
(f) O3
(g) ClO3-

SF4
PF5
PCl5
Br3-
XeF4

thanks!

Molecules of PF3 are polar, whereas molecules of PF5 are non-polar.

Is this all to do with molecular orbitals and those unpaired electrons? If so, could someone please help me with a molecular orbital energy-level diagram?

Hello

I would like to ask why H2S's boiling point is higher than HCl's.

Thanks

I need help!!!! I was asked to figure out the Lewis Structure of ammonium hydroxide and no matter how hard I try I can't figure it out. Someone help, please!!!