Differentiating Chemical and Physical Changes

What is the main characteristic of a chemical change?

• The substance changes its state.

• The substance changes its shape.

• Different molecules are present at the beginning and end.

• The substance remains the same.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• Melting ice

• Boiling water

• Cutting paper

• Rusting iron

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the chemical formula for rust?

• FeO2

• Fe3O4

• Fe2O3

• FeO

Tags

NGSS.MS-PS1-1

Which of the following is NOT a common indicator of a chemical change?

• Color change

• Change in shape

• Formation of a new substance

• Change in smell

Tags

NGSS.MS-PS1-2

What defines a physical change?

• The substance changes its chemical properties.

• The same molecules are present at the beginning and end.

• New molecules are formed.

• The substance cannot be reversed.

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

• Burning wood

• Rusting iron

• Cutting a nail in half

• Souring milk

What is a key difference between chemical and physical changes?

• Chemical changes can be easily reversed.

• Physical changes involve the formation of new substances.

• Chemical changes often involve a color change or smell.

• Physical changes always involve a change in temperature.

Tags

NGSS.MS-PS1-1

Which of the following is a chemical change?

• Dissolving sugar

• Boiling water

• Baking bread

• Melting ice

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why is dissolving sugar in water considered a physical change?

• It creates a new substance.

• It changes the chemical properties of sugar.

• It cannot be reversed.

• The sugar molecules remain the same.

What happens when gasoline is burned?

• It releases energy by breaking chemical bonds.

• It undergoes a physical change.

• It changes its state.

• It remains the same substance.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5