(Q2) Endothermic and Exothermic Reactions

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What is an exothermic reaction?

Back

A chemical reaction that releases energy to its surroundings, usually in the form of heat or light.

Front

What does the law of conservation of energy state?

Back

Energy cannot be created or destroyed, only transformed from one form to another.

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, where plants absorb sunlight to convert carbon dioxide and water into glucose.

Front

What happens to temperature during an exothermic reaction?

Back

The temperature of the surroundings increases as energy is released.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature of the surroundings decreases as energy is absorbed.

Front

What is the role of activation energy in chemical reactions?

Back

It is the minimum energy required to initiate a chemical reaction.

Front

How can you identify an exothermic reaction?

Back

By observing the release of heat or light during the reaction.

Front

How can you identify an endothermic reaction?

Back

By observing a decrease in temperature or the absorption of heat during the reaction.