explanations to collegeboard sat chem test?

Quicksandslowly
Fri, 03 Oct 2008 18:14:33 +0000

07-08 Prep Book

101 Statement 2 - Dunno

105 Statement 2 - Equilibrium can only be changed by Temperature and Pressure.

12 - the Cu2+ accounts for 2 Cu, so the I- = 4

13 - I don’t know sorry.

15 - PF3 is trigonal pyramidal because it has 4 electron pairs but 1 of which is a Lone pair, which is not bonded to anything.

19 - Well, since it’s 0.5 mol you divided what you get by half. So 4 moles of O is actually 4 x 0.5 x 6.02 x 10^23 (Avagadros Number; Mole) = 1.2 x 10^24.

20 - Well, there’s 2 atoms in O2 and 3 atoms in CO2, so CO2 wil always be more dense than O2.

23 - Don’t know either.

Someone please explain 101, 104, 13, and 23?