Physical vs Chemical Changes

What defines a physical change?

• Formation of chemical bonds

• Creation of a new substance

• Changes in appearance only

• Breaking of chemical bonds

What is an example of a physical change?

• Burning paper

• Mixing acid and base

• Cutting hair

• Cooking an egg

Tags

NGSS.MS-PS1-4

What phase changes are considered physical changes?

• Dissolving and precipitating

• Melting and freezing

• Burning and condensing

• Reacting and exploding

Tags

NGSS.MS-PS1-4

Which of the following is a physical change?

• Cooking of food

• Rusting of iron

• Melting of ice

• Burning of wood

Tags

NGSS.MS-PS1-4

Why is mixing salt and water a physical change?

• It produces bubbles

• It involves a change in temperature

• It creates a new substance

• The salt and water can be separated

What happens during a chemical change?

• No new substance is formed

• Only a change in appearance

• Breaking or making of chemical bonds

• No indicators are present

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What distinguishes a chemical change from a physical change?

• Change in color only

• Formation of a new substance

• No new properties are formed

• Only a change in state

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an indicator of a chemical change?

• Separation of a mixture

• Burning or fire

• Change in phase

• Change in size

Tags

NGSS.MS-PS1-2

What does a temperature change without heating or cooling suggest?

• Chemical change

• Physical change

• Phase change

• No change

What does an explosion indicate?

• Phase change

• Reversible change

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5