Endothermic vs. Exothermic Reactions

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature. Example: Photosynthesis.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings, resulting in an increase in temperature. Example: Combustion of fuels.

Front

Give an example of an endothermic reaction.

Back

Evaporation of water, where water absorbs heat to change from liquid to vapor.

Front

Give an example of an exothermic reaction.

Back

Rusting of iron, where energy is released as iron reacts with oxygen.

Front

What happens to energy in an endothermic reaction?

Back

Energy is absorbed from the surroundings.

Front

What happens to energy in an exothermic reaction?

Back

Energy is released into the surroundings.

Front

How does temperature change in an endothermic reaction?

Back

The temperature of the surroundings decreases.

Front

How does temperature change in an exothermic reaction?

Back

The temperature of the surroundings increases.

Front

What is the role of heat in photosynthesis?

Back

Heat from sunlight is absorbed to break down water and carbon dioxide into glucose and oxygen.

Front

What is the role of heat in combustion?

Back

Heat is released when a substance burns, producing light and heat.