Why plants going through photosynthesis a chemical change?

Photosynthesis is a chemical change because it involves the transformation of reactants, carbon dioxide and water, into new products, glucose and oxygen, through a series of chemical reactions. During this process, light energy is absorbed by chlorophyll and converted into chemical energy, leading to the synthesis of glucose, which stores energy. The molecular structure of the reactants is altered, resulting in entirely different substances, which characterizes a chemical change.