Question

If an exothermic reaction in equilibrium experiences a rise in temperature, what happens?

• A. The reaction shifts to the left toward reactants.
• B. The reaction shifts to the right toward products.
• C. The reaction shifts to the left toward products.
• D. The reaction shifts to the right toward reactants.
• E. The reaction remains unchanged.

Answer 1

The correct option is A The reaction shifts to the left toward reactants.

If an exothermic reaction in equilibrium experiences a rise in temperature, the reaction shifts to the left toward reactants.
In an exothermic reaction, heat is given out. When temperature is increased, heat will be absorbed in the reverse reaction so that the effect of increase in temperature is minimized.
The Le Chatelier's Principle states that any change in a substance on one side of the equation, either in concentration, temperature, pressure or volume, results in an equilibrium shift to oppose the change until a new equilibrium is reached.