Endothermic and Exothermic Reactions

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat, to its surroundings.

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.

Front

Give an example of an exothermic reaction.

Back

Burning wood is an example of an exothermic reaction, as it releases heat and light.

Front

Give an example of an endothermic reaction.

Back

Photosynthesis in plants is an example of an endothermic reaction, as it absorbs sunlight to convert carbon dioxide and water into glucose.

Front

What happens to energy in an exothermic reaction?

Back

In an exothermic reaction, energy is released when chemical bonds are formed.

Front

What happens to energy in an endothermic reaction?

Back

In an endothermic reaction, energy is absorbed when chemical bonds are broken.

Front

True or False: Exothermic reactions absorb heat from their surroundings.

Back

False. Exothermic reactions release heat.

Front

True or False: Endothermic reactions feel cold to the touch.

Back

True. Endothermic reactions absorb heat, making them feel cold.

Front

What is the main characteristic of exothermic reactions?

Back

The main characteristic of exothermic reactions is that they release energy.

Front

What is the main characteristic of endothermic reactions?

Back

The main characteristic of endothermic reactions is that they absorb energy.