Question

baking cookies are what type of change?
a thermal change
a chemical change
a physical change

Explanation:

Baking cookies involves reactions like protein denaturation and starch gelatinization, forming new substances (e.g., caramelization, Maillard reaction). Physical changes don't create new substances, and "thermal change" isn't a standard change type (thermal is energy transfer). Chemical change creates new matter, so baking cookies is a chemical change.

Answer:

B. A chemical change