7.6A Physical & Chemical Changes in the Digestive System

If you melt a popsicle, it this a chemical or physical change?

• physical

• chemical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If you burn your marshmallow while making smores, is this a chemical or physical change?

• physical

• chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• physical

• chemical

• both

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

• Hydrochloric acid in the stomach breaks down proteins

• Chewing in the mouth breaks food into small pieces

• Enzymes in saliva start the digestion of starches before food is swallowed

• Bacteria in the intestines convert dietary fiber into fats

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

Tags

NGSS.MS-LS1-7

Many processes occur in the digestive system. Which process is best classified as a physical change?

• Saliva converting the starch molecules in crackers into simple sugars

• Digestive enzymes breaking down proteins into smaller fragments

• Bacteria converting lactose into simple sugars in the intestines

• Teeth grinding an almond into smaller pieces in the mouth