7.6B Digestion- Physical and Chemical changes

Saliva converting the starch molecules in crackers into simple sugars

• physical change

• chemical change

Digestive enzymes breaking down proteins into smaller fragments

• physical change

• chemical change

Bacteria converting lactose into simple sugars in the intestines.

• physical change

• chemical change

Teeth grinding an almond into smaller pieces in the mouth.

• physical change

• chemical change

The breakdown of molecules of food by enzymes and acid in the stomach

• physical change

• chemical change

The movement of food to the stomach after food is swallowed

• physical change

• chemical change

The reduction in size of food particles as food is chewed

• physical change

• chemical change

Saliva changing the starch in the pizza crust to sugar

• physical change

• chemical change

Where does the first step in digestion take place?

• mouth

• esophagus

• stomach

• small intestine

In the process of digestion, where do chemical changes begin?

• mouth

• esophagus

• stomach

• small intestine