Chemical reactions can be done through: 1. Physical contact 2. Solution of reactants 3. Electricity 4. Heat 5. Light 6. Catalyst
Sunlight is important not only for us but also for plants as welll. As you know photosynthesis is a process in which light energy from the sun is used by the plants to prepare starch from carbon dioxide and water. Example: The sunlight uses the chemical reaction between carbon dioxide and water, which finally ends up in the production of starch (photo means light and synthesis means production). These chemical reactions is used by light are called as photochemical reactions.
