Which term describes a reaction that absorbs energy in the form of heat?

Which term describes a reaction that absorbs energy in the form of heat?

• A. Exothermic reaction
• B. Endothermic reaction
• C. Physical Change
• D. Metal

Answer: (B)

The idea being tested is how heat flows in reactions. An endothermic reaction is the one that absorbs heat from its surroundings, so the system gains energy and the outside environment often feels cooler as the reaction proceeds. That’s why the term describing a reaction that takes in heat is endothermic reaction. Exothermic reactions do the opposite: they release heat to the surroundings, making the outside feel warmer. A physical change describes changes in form or state that don’t involve making new substances and isn’t about heat flow in a chemical sense. Metal is simply a material type, not a description of how a reaction exchanges energy.

The idea being tested is how heat flows in reactions. An endothermic reaction is the one that absorbs heat from its surroundings, so the system gains energy and the outside environment often feels cooler as the reaction proceeds. That’s why the term describing a reaction that takes in heat is endothermic reaction.

Exothermic reactions do the opposite: they release heat to the surroundings, making the outside feel warmer. A physical change describes changes in form or state that don’t involve making new substances and isn’t about heat flow in a chemical sense. Metal is simply a material type, not a description of how a reaction exchanges energy.