Predict the effect of increasing temperature on equilibrium position for endothermic and exothermic reactions.

• A. Endothermic: increasing temperature shifts toward products; Exothermic: increasing temperature shifts toward reactants.
• B. Opposite for endo/exo.
• C. Temperature has no effect on equilibrium.
• D. Increasing temperature shifts toward more reactants for both.

Answer: (A)

This question tests how temperature changes shift a chemical equilibrium according to Le Chatelier's principle. Increasing temperature adds heat to the system. If the forward process is endothermic (it absorbs heat), adding heat drives the equilibrium toward more products. If the forward process is exothermic (it releases heat), adding heat pushes the equilibrium toward the reactants to consume the extra heat. So increasing temperature shifts toward products for an endothermic reaction and toward reactants for an exothermic reaction. Statements claiming temperature has no effect or that both cases shift the same way don’t fit with how heat is involved in the reaction enthalpy.