Chemistry question?

1. For the following equations, tell in which direction, left or right, the equilibrium will shift when these changes are made: The temperature is increased, the pressure is increased by decreasing the volume of the reaction vessel, and a catalyst is added.
a. 3 02(g) + 271 k] --> 2 03(g)
b. CH4(g) + Cl2(g) ---> CH3Cl(g) + HCI(g) + 110k]
c. 2 NO(g) + 2 H2(g) --> N2(g) +2H20(g)+665 k]

2. Decide whether these salts form an acidic, basic, or neutral solution when dissolved in water:
a. CaBr2
b. Al(NO3)3
c. NaCN
d. K3PO4

3.One of the important pH-regulating systems in the blood consists of a carbonic acid-sodium hydrogen carbonate buffer: H2CO3(aq) --> H+(aq) + HCO3-(aq) NaHCO3(aq)---> NA+(aq)+HCO3-(aq) Explain how this buffer resist changes in pH when excess acid, H+, gets into the bloodstream.