Question

An exothermic reaction is one in which the reacting substances :

• A. have more energy than the products.
• B. have less energy than the products.
• C. have equal energy as the products.
• D. are at a higher temperature than the products.

Answer 1

The correct option is A have more energy than the products.

In an exothermic reaction, the enthalpy change is negative as the enthalpy of reactants is higher than the enthalpy of products.

$\Delta H=\Sigma H_P-\Sigma H_R=negative$, when $\Sigma H_R>\Sigma H_P$

Hence, during such reactions, heat is liberated.

Hence, option A is the correct answer.