Chemical and Physical Changes in Digestion

If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a

• Chemical change

• Physical change

• Both a physical and chemical change

• Neither a physical or chemical change

The statue of liberty turning green is an example of a _____________.

• physical change

• painting

• chemical change

• a statute become old

Tags

NGSS.MS-PS1-2

When you swallow your food and the food is then getting digestive in stomach acid and different enzymes, that is considered___________.

• physical change

• chemical change

• mechanical digestion

• chemical digestion

Which is an example of chemical change?

• Water freezes

• Wood is cut

• Bread is baked

• Wire is bent

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What property stays the same during physical and chemical changes?

• Density

• Shape

• Mass

• Arrangement of particle

Tags

NGSS.MS-PS1-5

Taking a HUGE bite out of your favorite food and chewing it is______________.

• chemical change

• physical change

• mechanical digestion

• chemical digestion

When you eat food, you turn ___________ into ___________.

• chemical energy , thermal energy

• thermal energy , potential energy

• kinetic energy, potential energy

• thermal energy, chemical energy

Tags

NGSS.MS-LS1-6

Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules.

Which statement best describes changes to food during digestion?

• The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.

• The muscle contractions and the action of the peptidase both result only in physical changes.

• The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes.

• The muscle contractions and the action of the peptidase both result only in chemical changes.

Tags

NGSS.MS-PS1-2

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

• F. Hydrochloric acid in the stomach breaks down proteins.

• G. Chewing in the mouth breaks food into smaller pieces.

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

• J. Bacteria in the intestines covert dietary fiber into fats.

Which of the following processes in digestion is a chemical change?

• Chewing food in the mouth

• Swallowing food

• Stomach acid breaking down proteins

• Food moving through the intestines

Tags

NGSS.MS-PS1-2