Physical vs Chemical Changes Diffit

What happens during a physical change?

• A new substance is formed

• The chemical composition changes

• The appearance or form changes

• Atoms rearrange to form new bonds

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

• Rusting iron

• Burning wood

• Melting ice

• Baking bread

In a chemical change:

• Molecules rearrange without changing identity

• A new substance is formed

• The original substance is easily recovered

• Only the shape changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Burning wood is a chemical change because:

• Only its appearance changes

• The wood molecules rearrange without forming new substances
  

• It produces ash, gases, and heat, which are new substances
  

• It can be reversed easily

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is often reversible?

• Chemical change
  

• Physical change

• Both A and B

• Neither A nor B

Which of these is NOT a chemical change?

• Baking a cake
  

• Melting butter

• Digesting food

• Burning gasoline

Tags

NGSS.MS-PS1-2

Which of these is NOT usually reversible?

• Freezing water

• Condensing steam

• Burning paper

• Melting chocolate

Which statement is TRUE?

• Physical changes always create new substances

• Chemical changes never produce energy

• Physical changes are usually reversible

• Chemical changes are easily undone

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

Which indicator is LEAST reliable for confirming a chemical change?

• Change in color

• Release of gas

• Temperature change

• Change in size

Tags

NGSS.MS-PS1-2

Why is melting considered a physical change?

• The molecules form a brand-new substance

• The process cannot be reversed

• The composition of the substance remains the same

• It produces new chemical properties