sentence: Light can have a lot of energy and is able to break chemical bonds.
sentences_before: Photocatalysis' is using light as a catalyst to increase the rate of a photoreaction. Most known photoreactions begin when light creates a free radical in the reaction system.
sentences_after: For example some things fade or lose their color when left in sunlight. When light breaks the chemical bonds, free radicals are produced. A free radical is a molecule, atom or an ion that needs an electron. The free radical will take electrons from other molecules or atoms and this starts chemical reactions.
concept_name: light
headings: Photocatalysis
categories: Chemistry