Exothermic and Endothermic Reactions

Front

What is an exothermic reaction?

Back

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

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs energy from the surroundings, usually resulting in a temperature decrease.

Front

How do endothermic reactions affect temperature?

Back

They usually feel cold because they absorb heat from the surroundings.

Front

How do exothermic reactions affect temperature?

Back

They usually feel hot because they release heat to the surroundings.

Front

What is an example of an exothermic reaction?

Back

Combustion of fuels, such as burning wood or gasoline.

Front

What is an example of an endothermic reaction?

Back

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

Front

What is the role of energy in an endothermic reaction?

Back

Energy is required as an input to drive the reaction forward.

Front

What is the role of energy in an exothermic reaction?

Back

Energy is released as a product of the reaction.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is an inhibitor?

Back

A substance that decreases the rate of a chemical reaction.