Understanding Physical and Chemical Changes

What is a physical change?

• A change in form without changing chemical identity

• A change in chemical identity

• A change that is always irreversible

• A change that always involves a precipitate

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

• Melting ice

• Dissolving sugar in water

• Mixing vinegar and baking soda

• Boiling water

Tags

NGSS.MS-PS1-2

What is a common sign of a chemical change?

• Change in state

• Formation of a precipitate

• Reversibility

• No change in chemical identity

Tags

NGSS.MS-PS1-2

What happens when sugar dissolves in water?

• It undergoes a chemical change

• It forms a new substance

• It undergoes a physical change

• It becomes irreversible

Why is understanding physical and chemical changes important?

• To predict the behavior of substances

• To always reverse changes

• To avoid chemical reactions

• To ensure all changes are physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5