Consider the reaction:

According to the concentration-time graph above, what event took place at time that led to the change in equilibrium concentrations shown?

In the reaction: 

If the concentration of hydrogen iodide is decreased, what will happen according to Le Chatelier’s principle?

The equation for a reaction is

The expression for the equilibrium constant for the reaction is

The oxidation of nitrogen monoxide, , to nitrogen dioxide, , can be represented by the following equation:

of and of were added to a reaction vessel kept at . The amount of present at equilibrium is .

What is the equilibrium constant at ?

Consider the equilibrium reaction:

Which statement is true regarding the concentrations of the species at equilibrium?

Which of the following statements best describes the impact of a catalyst on the enthalpy change of a chemical reaction?