* Breakdown of complex molecules: The apple contains complex carbohydrates (like starch), sugars, and other organic compounds. When it decomposes, these molecules are broken down into simpler molecules like sugars and acids.
* Oxidation and fermentation: Microorganisms like bacteria and fungi use the sugars in the apple for energy. This process involves oxidation (loss of electrons) and fermentation, resulting in the production of carbon dioxide, water, alcohol, and various acids.
* Change in appearance and properties: The apple's appearance changes dramatically during decomposition. It becomes soft, mushy, brown, and develops an unpleasant smell. This is due to the formation of new substances with different properties.
* Irreversible change: The decomposition process cannot be easily reversed. You can't simply "undo" the changes that have occurred to the apple to make it whole again.
In summary: The decomposition of an apple is a chemical change because it involves the breaking and forming of new chemical bonds, resulting in the formation of new substances with different properties. This change is irreversible and cannot be easily undone.
