Question

7.60 distinguish between physical and chemical changes in matter in the digestive system
physical change
as food travels through the digestive system, it undergoes a series of physical and chemical changes that break it down to provide energy for cells. physical changes simply alter the appearance of something. for example, chewing breaks large food molecules into smaller ones.
chemical change
chemical changes occur when the chemical make - up of the food particle is changed to create a new substance. during the digestive process, enzymes change carbohydrates, proteins, fats and nucleic acids into substances that can be absorbed by cells called chyme.

Explanation:

Physical changes in digestion (e.g., chewing) alter appearance (break large molecules). Chemical changes (e.g., enzyme action) change chemical makeup (create new substances like chyme).

Answer:

Physical changes alter appearance (e.g., chewing), chemical changes alter chemical makeup (e.g., enzyme - induced chyme formation).