Endothermic and Exothermic Reactions

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat energy to the surroundings.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat energy from the surroundings.

Front

What happens to temperature during an exothermic reaction?

Back

The temperature of the surroundings increases because heat is released.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature of the surroundings decreases because heat is absorbed.

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 sunlight is absorbed.

Front

What is the role of heat in an endothermic reaction?

Back

Heat is taken in or absorbed during the reaction.

Front

What is the role of heat in an exothermic reaction?

Back

Heat is given out or released during the reaction.

Front

What type of reaction occurs when zinc reacts with hydrochloric acid (HCl)?

Back

An exothermic reaction occurs.

Front

What is the process of a solid changing to a liquid and then to a gas called?

Back

This is an endothermic process.