7.6A Chemical and Physical changes (enzymes)

Front

What kind of change results from the breakdown of starch into glucose by saliva?

Back

chemical

Front

What change occurs to food by your teeth as you chew?

Back

physical changes only

Front

Which step in the digestive process represents a chemical change in food?

Back

enzymes within the small intestines breaking down the food into smaller molecules

Front

Your stomach digests a yummy cookie with enzymes. Is this chemical or physical digestion? Is it both?

Back

chemical

Front

Which of the following is a chemical change that occurs to the food?

• The reduction in size of food particles as food is chewed
• The movement of food to the stomach after food is swallowed
• The breakdown of molecules of food by enzymes and acid in the stomach
• None of the above

Back

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

Front

Which describes only a physical change during digestion?

Back

Chewing in the mouth breaks food into small pieces

Front

A change in the shape of a substance

Back

Physical change

Front

A transformation of one substance into another substance

Back

Chemical change

Front

Results in a chemical change and the formation of a new substance

Back

Chemical reaction

Front

Evidence of a chemical change

Back

Precipitate