* Decomposition: Rotting involves the breakdown of complex organic molecules (like sugars and starches) into simpler compounds. This is driven by microorganisms like bacteria and fungi. This breakdown is a chemical process.

* New Substances Formed: As the fruit decomposes, new substances are formed, such as acids, alcohols, and gases. These new substances have different properties than the original fruit.

* Irreversible: The changes in a rotten fruit are irreversible. You cannot simply "un-rot" the fruit; the chemical changes have altered its composition permanently.

* Change in Properties: The rotting process changes the fruit's color, smell, texture, and taste. These changes are a direct result of the chemical reactions occurring within the fruit.

In contrast, a physical change would only alter the form or appearance of the fruit, but not its chemical composition. For example, cutting a fruit into pieces is a physical change, as the fruit's composition remains the same.

Therefore, the rotting of a fruit is a chemical change because it involves the formation of new substances with different properties and is irreversible.