Chem help please! SAT II questions?

Question

Can someone please answer these questions and explain the reason for the chosen answers? Thanks!

1) One mole of each of the following substances is disolved in 1.0 kg of water. Which solution will have the lowest freezing point?
(a) NaC2H3O2
(b) NaCl
(c) MgCl2
(d) CH3OH
(e) C6H12O6

2. how is high or low freezing/boiling point determined?

3. Given the following reactionat equilibrium: Fe+3(aq) + SCN-(aq) --> FeSCN+2 Which of these would shift the equilibrium to the left?

(a) Adding FeCl3 to the reaction
(b Adding NH4SCN to the reaction
(c) Increasing the pressure on the reaction
(d) adding a catalyst
(e) Adding FeSCN+2(aq) to the reaction

4) Enough AgCl(s) is dissolved in water at 298K to produce a saturated solution. The concentrationof Ag+1 ions is found to be 1.3x10^-5 M. What is the Ksp value for AgCl?

Please answer the ones you can!

Answer 1

1. Freezing point depression depends on the number of ions/molecules created per mole. MgCl2 has the most

3. (e)
4. 1.7x10-10 = [Ag+]*[Cl-]

Answer 2

Study "Endothermic and Exothermic reactions" because I don't want to give you the wrong answer. Also if you concern Heat Physics (Quantum Physics) that won't be bat.