photochemical reactions

Photochemical reactions are chemical changes that occur when substances absorb light energy, typically from sunlight or artificial light sources. This absorbed energy excites the molecules, causing them to reach a higher energy state. As they return to normal, they undergo chemical transformations, forming new substances. These reactions are essential in processes like photosynthesis, where plants convert light into food, and in the production of sunglasses, dyes, and photographic films. Overall, photochemical reactions are a way light drives chemical transformations, enabling various natural and technological processes.