Chemistry Chapter 5- Energy Changes

How is energy is transferred to or from the surroundings during a chemical reaction

Through exothermic reaction

What is an exothermic reaction

A reaction where energy is released to the surroundings

What is endothermic reaction

A reaction that absorbs energy from the surroundings

_{Examples of exothermic reactions}

• Combustion

• Neutralisation

Examples of endothermic reactions

• Photosynthesis

• Melting

What is collision theory

A scientific explanation of how chemical reactions occur

What is activation energy

The minimum amount of energy needed for a chemical reaction to occur

What are the energy changes in breaking and making bonds

Energy is absorbed for breaking bonds, (endothermic process). Energy is released when making bonds, (exothermic process).