Chemical and Physical Change

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.

What is a physical change?

• new materials with different properties and one or more than one new substances are formed.

• A change in matter which does not alter the chemical properties of the matter.

• Bacteria in the intestines convert dietary fiber into fats.

Which best describes this change?

• A . This is a physical change because the wind dissolved the large rock into smaller pieces that have different properties.

• B. This is a chemical change because the wind dissolved the large rock into smaller pieces that have different properties.

• C. This is a physical change because the wind broke down the large rock into smaller pieces that still have the same properties.

• D. This is a chemical change because the wind broke down the large rock into smaller pieces that still have the same

Tags

NGSS.MS-ESS2-2

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

• A. The reduction in size of food particles as food is chewed.

• B. The movement of food to the stomach after food is swallowed

• C. The breakdown of food by enzymes and acid in the stomach

• D. None

Tags

NGSS.MS-LS1-7

1. What is a chemical change?

• new materials with different properties and one or more than one new substances are formed.

• A change in matter which does not alter the chemical properties of the matter.

• Bacteria in the intestines convert dietary fiber into fats.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5