Physical and
Chemical
Changes
Physical Change

A CHANGE that influences the
APPEARANCE of a substance but
NOT what it is.
Indicators of a Physical Change:

Change in Size- substance gets larger or smaller
EX: cutting, breaking, add more substance

Change in Shape- a new shape is formed
EX: molding or folding
Indicators of a Physical Change:

Change in State- a new state of matter is formed
EX: melting, freezing, boiling, dissolving

EXPECTED color changeEX: painting a wall
Chemical Change

A CHANGE that forms a NEW
substance with NEW properties.
chemical changes/reactions

Temperature Change
-ENDOthermic- traps heat inside and
becomes colder
-EXOthermic –releases heat and
become hotter
chemical changes/reactions

Gas Formation EX: bubbling or fizzing

UNEXPECTED Color Change

Oxidation
EX: rusting or rotting

Cooking
EX: baking or heating
Examples



Now try the following examples below
Guess if you think it is PHYSICAL or
CHEMICAL change
Check your answer on the following slide.
Is it a chemical or physical change?

Logs burning
•Chemical Change
•Physical Change
Correct!
CHEMICAL!
Is it a chemical or physical change?

Cooking hotdogs on a grill.
•Chemical Change
•Physical Change
Correct!
CHEMICAL!
Is it a chemical or physical change?

Cutting paper
•Chemical Change
•Physical Change
Correct!
PHYSICAL!
Is it a chemical or physical change?

Crushing an
aspirin
•Chemical Change
•Physical Change
Correct!
PHYSICAL!
Is it a chemical or physical change?

Metal rusting
•Chemical Change
•Physical Change
Correct!
CHEMICAL!
Is it a chemical or physical change?

An egg rotting
•Chemical Change
•Physical Change
Correct!
CHEMICAL!
Is it a chemical or physical change?

Sugar dissolving in tea
•Chemical Change
•Physical Change
Correct!
PHYSICAL!
Is it a chemical or physical change?

Melting an ice cube
•Chemical Change
•Physical Change
Correct!
PHYSICAL!