Le Chatelier's Principle

According to Le Chatelier's Principle, what happens to a system at equilibrium if the concentration of a reactant is increased?

What is the effect of increasing temperature on an exothermic reaction at equilibrium?

In the reaction $N_{2}(g) + 3H_{2}(g) \rightleftharpoons 2NH_{3}(g)$, what will happen if the pressure is increased?

What will happen to the equilibrium position of the reaction $A(g) + B(g) \rightleftharpoons C(g)$ if an inert gas is added at constant volume?

In a reaction where $D(g)$ is produced, what happens if the concentration of $D$ is decreased?

What effect does adding a catalyst have on a system at equilibrium?

For the reaction $2SO_{2}(g) + O_{2}(g) \rightleftharpoons 2SO_{3}(g)$, what is the effect of increasing the concentration of ?

If a reaction at equilibrium is exothermic and the temperature is decreased, what will be the effect on the equilibrium position?

In the equilibrium system $H_{2}(g) + I_{2}(g) \rightleftharpoons 2HI(g)$, what is the effect of increasing the pressure?