Identify whether or not perturbations A-D will affect the equilibrium concentrations of reactants and products in a gas-phase endothermic chemical reaction that involves one or more gases. If all have an effect on the equilibrium concentrations, select response E. Otherwise, identify the one that does not affect the equilibrium concentrations.

Question

Quizplus · Accepted Answer

Increasing pressure by adding an inert gas to a reaction in the gas phase does not affect the equilibrium concentrations because an inert gas does not participate in the reaction. The partial pressures of the reactants and products remain the same, and the equilibrium position does not change. 
Choices A, B, and C all affect the equilibrium concentrations because they change the reaction conditions and shift the equilibrium towards the side with fewer moles of gas (Le Chatelier's principle). Therefore, E is also a valid choice as all of the perturbations have an effect on the equilibrium concentrations.

Identify Whether or Not Perturbations A-D Will Affect the Equilibrium