all right so we have our final exam for honors chemistry this wednesday, and our teacher gave us a list of what we need to know for the test. So I have a question about one thing, but I may post more if I don't know other things, just warnin ya.

So yeah-- how do you calculate valence electrons?

thanks.

Odd question- does anyone have the scoring sheets for the 2003 Ap Chem Free Response questions?  I'm much in need to score this sucker.  Thanks!

Good luck to everyone taking the AP Chem exam. I believe it's this coming Wednesday (5-10-06).

I'm back in need of help ( Read more... )

Hey, I'm back again, twice in one day lol, I'm desperately in need of help, I got a test on Friday....so here are some questions ( Read more... )

Ok i'm new here, and I hope someone can help, i'm in Hon. Chem this year and I'm really confused these past 2 chapters, on solutions and solids, with stuff like heat of vaporization/fusion , and London dispersion forces, etc., which I don't understand very well. Here's a problem that is probably a stupid question but if anyone can help...thanks ( Read more... )

Must complete 2 AP exams (1999 exam and 2001 exam) for Friday. I am currently on the first problem of the 1999 exam (its SO long...) and I am stuck already. =( I don't know what to do for some of these as we never really learned it ( Read more... )

does anyone know a good site to explain chemical kinetics? I really need help with graphing and activation energy.

Thanx

A buffer solution is prepared by adding 15.00g of sodium acetate (NaC2H3O2) and 12.5g of acetic acid to enoug water to make 500 mL (three sig figs) of solution ( Read more... )

So um I'm new to this community and I need help with chemistry. I need ta find the molality, molarity, and mole fraction of the following problem but I don't know how if I don't have the grams:a commomly purchased disinfectant is 3.0% (by mass) solution of hydrogen peroxide (H2O2) and water.Assume that the density of the solution is 1.0g/cm cubed ( Read more... )