Which form of energy is absorbed by an endothermic reaction?

• A. Heat energy
• B. Light energy
• C. Sound energy
• D. Electrical energy

Answer: (A)

Verified step by step guidance

1. Understand the definition of an endothermic reaction: it is a chemical reaction that absorbs energy from its surroundings.
2. Recall that energy can be absorbed in various forms such as heat, light, sound, or electrical energy.
3. Recognize that in most common endothermic reactions, the energy absorbed is in the form of heat, which increases the system's internal energy.
4. Eliminate other options by considering typical reaction conditions: sound and electrical energy are less commonly absorbed in chemical reactions, and light energy absorption is specific to photochemical reactions.
5. Conclude that the form of energy absorbed by an endothermic reaction is heat energy.