Endothermic and Exothermic Reactions

Front

What is an exothermic reaction?

Back

A chemical reaction in which more energy is released when the products form than is required to break the bonds in the reactants.

Front

What is an endothermic reaction?

Back

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

Front

What happens to energy during an exothermic reaction?

Back

Energy is released into the surroundings.

Front

What happens to energy during an endothermic reaction?

Back

Energy is absorbed from the surroundings.

Front

Is energy created during a chemical reaction?

Back

No, energy is neither created nor destroyed; it is transformed.

Front

What is the role of energy in breaking chemical bonds?

Back

Energy is absorbed to break bonds between atoms.

Front

What is the role of energy in forming chemical bonds?

Back

Energy is released when bonds are formed between atoms.

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 is the law of conservation of energy?

Back

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