The following diagram represents a gas-phase equilibrium mixture for the reaction AB ⇆ A +...

The following diagram represents a gas-phase equilibrium mixture for the reaction AB ⇆ A + B at a certain temperature. Describe what would happen to the system after each of the following changes: (a) the temperature is decreased, (b) the volume is increased, (c) He atoms are added to the mixture at constant volume, (d) a catalyst is added to the mixture.