Physical and Chemical Changes in Matter

Front

Which process describes only a physical change?

Back

Water evaporating from salt water

Tags

112.27.b.6.C

Front

Which answer choice describes only a physical change during digestion?

Back

Chewing in the mouth breaks food into small pieces

Tags

112.27.b.6.C

Front

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?

Back

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

Tags

112.27.b.6.C

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

Back

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

Tags

112.27.b.6.C

Front

Which process in the digestive system is a physical change?

Back

Teeth grinding an almond into smaller pieces in the mouth

Tags

112.27.b.6.C

Front

What evidence can you use to infer that a chemical reaction has occurred here?

Back

A dark solid formed on the zinc metal

Tags

112.27.b.6.C

Front

What does a chemical change do?

Back

changes matter from one form to another.

Tags

112.27.b.6.C

Front

Is wood burning a physical or chemical change?

Back

Chemical

Tags

112.27.b.6.C

Front

Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?

Back

Number 3

Tags

112.27.b.6.C

Front

What observation supports the conclusion that a chemical reaction has occurred between zinc and hydrochloric acid?

Back

A new substance is formed