Exothermic and Endothermic 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 as heat is released.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature of the surroundings decreases as 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 evaporation?

Back

Heat energy is absorbed, causing water molecules to vibrate more and escape the surface.

Front

What is the Thermite reaction used for?

Back

The Thermite reaction is used to weld railway lines and is an exothermic reaction.

Front

What is a common characteristic of endothermic processes?

Back

They require heat to be absorbed from the surroundings.

Front

What is a common characteristic of exothermic processes?

Back

They release heat to the surroundings.