The AP Chemistry Study Thread

[Scareya]

Alright...I figured that question out.

My friend told me that the equilibrium frq isn't going to be acid-base b/c last year had an acid-base. Anybody heard of this theory?

Next question:

What's the difference between alkaline and alkaline earth metal salts from transition metal salts? (Physical appearance)

[Calculus Phobe]

Yeah, my old AP Chem teacher always tried to predict the 1st question.. our year (2004) he said it was going to be gas equilibrium.. he was wrong lol. It was Ksp. Last year was acid-base.. may we dare assume that this year is finally gas equilibrium??

[Scareya]

Hmm...alright - I guess I won't bet on it not being an acid-base equilbrium.

Anyway...one more question:

I'm really bad at descriptive chemistry...I don't know what color is what...I know all the concepts...but I have no clue on how to determine what color a given solutions. Anyone have a book that is really helpful? I heard CliffNotes has a book with all the labs.

[egghead9033]

just remember the basics
Iron=red
Copper=blue
Lead=yelloe
Potassium=purpleish
Iodine=yellow
Those are all I can think of at the moment.

[Evilbooyaa]

solution colors
Iron = yellow
Copper = blue
Lead = Yellow
Zinc = Greenish
Chromate = Orange?
Dichromate = Red?
think that's most of them.

flame test
Lithium = Strontium = Red
Sodium = Yellow
i think Copper = Green or maybe Potassium = Green....... idk.

[Puzzled01]

Flame Test:

Lithium (red)
Sodium (yellow)
Potassium (purple)
Barium (green)
Strontium (red)
Calcium (red)

In Solution:

Copper (blue)
Nickle (green)
Permanganate (purple)
Dichromate (orange)
Chromate (yellow)
Cobalt (pink)

when added to a base, ammonium solutions smell really bad.

[Scareya]

I just took the 1999 MC...I got a 45.5 raw score (51 right, 22 wrong, 2 omitted)...do you know where that is...let's say i get a 37 on the frqs?

[karot]

Wait, I thought Iodine was purple?

[Puzzled01]

Iodine and Bromine both turn dark brown in solution.

Scareya: you're doing really good if you average 45.5 on MC. I know that 82 is cut off for a 4 (which I got on my last practice exam!!) Right now I average about a 35 on MC.

[egghead9033]

Lead Iodide is really glittery and yellow. Mwahahahaha!!

[Puzzled01]

Maybe I should add nonpolar solvent =).

[Scareya]

I need to get a 5....although a 4 is not too bad.

[regurgitatingcow]

i am in a pretty good shape with the free response part, but am very worried about the multiple choice part, largely due to lack of practices
anyone could provide me with a copy of practice mult choice test via email? (other than 1999 one)

[Puzzled01]

Chances are you're going to get higher than a 37 on the FR. Know acid/base, ksp, thermodynamics, electrochem, atomic structure, bonding and shapes, kinetics, some lab stuff, and equation writing and there's most of the FR.

[Scareya]

regurgitating cow, send me a PM...or IM me (if I'm still there)