Exothermic and Endothermic Reactions

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat or light. Example: Combustion of fuels.

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. Example: Photosynthesis.

Front

What happens to temperature in an exothermic reaction?

Back

The temperature of the surroundings increases as energy is released.

Front

What happens to temperature in an endothermic reaction?

Back

The temperature of the surroundings decreases as energy is absorbed.

Front

Give an example of an exothermic reaction.

Back

Burning wood or fossil fuels.

Front

Give an example of an endothermic reaction.

Back

Dissolving ammonium nitrate in water.

Front

What is the role of energy in chemical reactions?

Back

Energy is either absorbed or released during chemical reactions, determining whether the reaction is exothermic or endothermic.

Front

What is the significance of the energy change in a reaction?

Back

The energy change indicates whether the reaction will occur spontaneously and helps predict the reaction's behavior.

Front

What is a hand warmer an example of?

Back

A hand warmer is an example of an exothermic reaction, as it releases heat to warm the hands.

Front

What is the relationship between temperature change and reaction type?

Back

A decrease in temperature indicates an endothermic reaction, while an increase indicates an exothermic reaction.