Endothermic and Exothermic Reactions

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs more energy to break the bonds of the reactants than is released when the products form.

Front

What is an exothermic reaction?

Back

A chemical reaction that releases more energy when the products form than is required to break the bonds of the reactants.

Front

What happens to energy during an endothermic reaction?

Back

Energy is absorbed from the surroundings.

Front

What happens to energy during an exothermic reaction?

Back

Energy is released into 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 law of conservation of energy?

Back

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

Front

Give an example of an endothermic reaction.

Back

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

Front

Give an example of an exothermic reaction.

Back

Combustion of fuels, such as burning wood or gasoline, which releases heat and light.

Front

What is the difference between endothermic and exothermic reactions in terms of energy flow?

Back

Endothermic reactions absorb energy, while exothermic reactions release energy.