How is moldy cheese a chemical change?

Moldy cheese is a chemical change because it involves a change in the chemical composition of the cheese. Here's why:

* Mold Growth: Mold is a type of fungus that grows on the cheese. It utilizes the cheese as a source of nutrients, breaking down the complex molecules within the cheese.

* Enzymes: The mold produces enzymes that break down the cheese's proteins, fats, and carbohydrates into simpler compounds. These compounds are then used by the mold for growth and reproduction.

* New Compounds: The breakdown process releases new compounds, including enzymes, acids, and alcohols, which alter the taste, texture, and appearance of the cheese.

* Irreversible Change: The chemical changes caused by mold growth are generally irreversible. The mold's enzymes permanently alter the cheese's structure and composition.

Key characteristics of a chemical change:

* Formation of new substances: Moldy cheese has different chemical compounds than the original cheese.

* Irreversible change: You can't simply remove the mold and get the original cheese back.

* Energy changes: The process of mold growth often involves the release or absorption of heat.

While moldy cheese might seem like a simple change in appearance, it involves a complex series of chemical reactions that fundamentally alter the cheese's makeup.