Lesson 14: Endothermic and Exothermic Reactions

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat, to its surroundings.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

True or false: Exothermic reactions mostly release energy.

Back

True

Front

It takes energy to ________________ bonds.

Back

break

Front

What happens to the temperature of the surroundings during an exothermic reaction?

Back

The temperature of the surroundings increases.

Front

What type of reaction occurs in a hand warmer?

Back

Exothermic.

Front

What is the role of chemical bonds in exothermic reactions?

Back

Chemical bonds that release a lot of energy when they're formed are formed between atoms.

Front

What is the energy change in an endothermic reaction?

Back

Energy is absorbed from the surroundings.

Front

Give an example of an exothermic reaction.

Back

Combustion of fuels, such as burning wood or gasoline.

Front

Give an example of an endothermic reaction.

Back

Photosynthesis in plants, where energy from sunlight is absorbed.