Which term describes a chemical change that results in energy being released as heat?

Which term describes a chemical change that results in energy being released as heat?

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

Answer: (D)

When energy is released as heat during a chemical change, that is an exothermic reaction. This term describes a process where bonds are rearranged to form new substances and, in doing so, give off heat to the surroundings, so the environment feels warmer. It’s a specific type of chemical change that emphasizes the direction of energy flow. A chemical change is the broad idea that substances transform into different substances, but it doesn’t specify whether heat is released or absorbed. A physical change, on the other hand, involves changes in state or appearance without forming new substances, so it doesn’t fit the description of a chemical change releasing heat. An endothermic reaction would be the opposite—one that absorbs heat from the surroundings.

When energy is released as heat during a chemical change, that is an exothermic reaction. This term describes a process where bonds are rearranged to form new substances and, in doing so, give off heat to the surroundings, so the environment feels warmer. It’s a specific type of chemical change that emphasizes the direction of energy flow. A chemical change is the broad idea that substances transform into different substances, but it doesn’t specify whether heat is released or absorbed. A physical change, on the other hand, involves changes in state or appearance without forming new substances, so it doesn’t fit the description of a chemical change releasing heat. An endothermic reaction would be the opposite—one that absorbs heat from the surroundings.