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Endothermic and Exothermic Reactions

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Energy and Reactions

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Endothermic and Exothermic Reactions

Physical Science

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Learners interact with exothermic and endothermic reactions and learn about heat energy changes in chemical reactions.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain that an endothermic reaction absorbs heat from its surroundings.
  • Explain that an exothermic reaction releases heat.
  • Identify if a chemical reaction is exothermic or endothermic.

Everything You'll Have Covered

Most chemical reactions involve the transfer of heat into or out of the reaction. Chemical reactions typically involve breaking chemical bonds and making new chemical bonds. In order to break bonds, energy has to be taken into the system. When chemical bonds are formed, energy is released from the system.

Exothermic reactions occur when the amount of energy released from the formation of bonds is greater than the amount of energy required to break the existing bonds. This energy comes out of the system in the form of heat. The heat energy can be measured by taking the temperature of the environment in direct contact with the reaction. If the temperature increases, the reaction is exothermic.

Endothermic reactions occur when the amount of energy released from the formation of bonds is less than the amount of energy required to break the existing bonds. This needed energy is in the form of heat in the surrounding environment. If the temperature of the environment is taken before and after the reaction, a decrease in temperature will be seen.

Tutorial Details

Approximate Time 20 Minutes
Pre-requisite Concepts Chemical bonding, chemical reactions, energy, heat, temperature.
Course Physical Science
Type of Tutorial Concept Development
Key Vocabulary atom, bond, chemical reaction