2023 Exothermic and Endothermic Reactions

Front

What is an exothermic reaction?

Back

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

Front

What is an endothermic reaction?

Back

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

Front

What happens to temperature during an exothermic reaction?

Back

The temperature increases.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature decreases.

Front

Give an example of an exothermic reaction.

Back

Combustion of methane (CH4 + 2O2 → 2H2O + CO2 + heat) is an example.

Front

Give an example of an endothermic reaction.

Back

Photosynthesis (6CO2 + 6H2O + light energy → C6H12O6 + 6O2) is an example.

Front

What is the role of heat in exothermic reactions?

Back

Heat is released into the surroundings.

Front

What is the role of heat in endothermic reactions?

Back

Heat is absorbed from the surroundings.

Front

How can you identify an exothermic reaction from a graph?

Back

The graph shows a decrease in energy of the system as heat is released.

Front

How can you identify an endothermic reaction from a graph?

Back

The graph shows an increase in energy of the system as heat is absorbed.