Question

food is digested in the stomach. this is a physical change this is a chemical change 1 point pancakes cook on a griddle. this is a physical change this is a chemical change 1 point milk sours (goes bad). * this is a physical change this is a chemical change 1 point

Explanation:

1. Food digestion in the stomach involves enzymes breaking down large - molecule nutrients into smaller ones. This forms new substances, so it's a chemical change.
2. Cooking pancakes on a griddle causes chemical reactions like the Maillard reaction, which changes the taste, color, and texture by forming new compounds. So it's a chemical change.
3. Milk souring is due to bacteria converting lactose into lactic acid, creating new chemical substances. So it's a chemical change.

Answer:

1. This is a CHEMICAL change
2. This is a CHEMICAL change
3. This is a CHEMICAL change