Question

Which of the following statements correctly describe exothermic and endothermic reactions? Select all that apply

Answer 1

Exothermic reactions release heat, while endothermic reactions absorb heat. Water boiling and ice forming on a pond are exothermic, while gasoline burning is exothermic.

Step-by-step explanation:

Exothermic and endothermic reactions can be thought of as having energy as either a reactant or a product. In an exothermic reaction, heat is released from the reaction mixture to the surroundings, resulting in a decrease in the enthalpy of the system. On the other hand, in an endothermic reaction, heat is absorbed from the surroundings to the reaction mixture, causing an increase in the enthalpy of the system.

Based on this information:

1. Water boiling: This process requires heat to convert water from a liquid to a gas, which means it is endothermic.
2. Gasoline burning: This process releases heat and energy, indicating that it is exothermic.
3. Ice forming on a pond: This process involves water freezing, and it releases heat to the surroundings. Therefore, it is an exothermic reaction.