Question

which of the following best describes the enthalpy change in an endothermic reaction?
a. positive, indicating energy is absorbed
b. positive, indicating energy is released
c. negative, indicating energy is absorbed
d. negative, indicating energy is released

Explanation:

In an endothermic reaction, the system absorbs energy from the surroundings. Enthalpy change ($\Delta H$) is defined as the heat content of the products minus the heat content of the reactants. For endothermic reactions, the products have more energy than the reactants, so $\Delta H> 0$, indicating energy is absorbed.

Answer:

A. Positive, indicating energy is absorbed