Understanding Physical and Chemical Changes

What is a key characteristic of a physical change?

• It creates a new substance

• It is usually reversible

• It involves a color change

• It produces gas

Which of the following is an example of a chemical change?

• Melting ice

• Freezing water

• Rusting iron

• Boiling water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to the molecules in a substance during a chemical change?

• They remain the same

• They rearrange to form something new

• They change state

• They increase in size

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT a sign of a chemical change?

• Color change

• Gas production

• Temperature change

• Change in shape

Tags

NGSS.MS-PS1-2

Why are chemical changes often not reversible?

• Because they involve a change in state

• Because they create a new substance

• Because they are physical changes

• Because they involve a change in size

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5