Physical changes alter a substance's size, shape, or state but do not change its chemical composition. They can be reversed through processes like freezing, melting, evaporation, and condensation. Chemical changes form new substances with different properties that cannot be reversed, such as burning wood to form ash. The document discusses the differences between physical changes like freezing water and chemical changes like burning wood.

1. Physical and Chemical ChangesPhysical and Chemical Changes
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2. Physical ChangesPhysical Changes
Physical change: when matter
changes size, shape, or form
◦ Physical changes can be reversed
◦ You know it is a physical change
when you can get it back somehow

3. Freezing and MeltingFreezing and Melting
 Water can be found as a solid (ice), liquid, and gas (water vapor)
 At room temperature, water is a liquid
 At 32° Fahrenheit (O° Celsius), water freezes and is a solid
◦ Water’s atoms begin to move at a slower rate
 32° Fahrenheit (O° Celsius) is also water’s melting point where it
becomes a liquid again

4. EvaporationEvaporation
Evaporation: the physical change of
matter from a liquid state to a gaseous
state
◦ Water’s boiling point is 100° C (212° F)

5. CondensationCondensation
Condensation: the physical change of
matter from a gaseous state to a liquid
state
◦ Ex: fog, dew on grass, glass of ice water
“sweating”

6. Chemical ChangesChemical Changes
Chemical change: a change in matter that
forms a new substance with different
properties
◦ Chemical changes can’t be reversed
◦ You know it’s a chemical change when it can’t go
back
Signs of a chemical change:
◦ Gas forms
◦ Heat is given off or absorbed
◦ A solid forms or disappears
◦ Light is produced

7. BurningBurning
 Wood is heated to a high temperature
and the heat makes the wood change
into a different type of matter
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You can’t change ash back into wood.

8. ““Property Changes” BrainPop VideoProperty Changes” BrainPop Video
and Physical and Chemical Changesand Physical and Chemical Changes
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