Physical vs Chemical Changes

Matter:
Physical vs Chemical
Changes
Physical Changes of Matter
• The appearance of matter may change, but the type of matter
remains unchanged (nothing new is made).
• Some may be reversible (example: states
crumpling of paper
of matter).
Physical Changes of Matter
Coloring a piece of paper
Physical Changes of Matter
Melting ice cream
Physical Changes of Matter
Sawing a piece of wood
Physical Changes of Matter
Freezing water
chemical Changes of Matter
• A substance changes into a new substance with a new identity
• Not reversible
Cooking: baking,
frying, etc.
chemical Changes of Matter
Food rotting
or spoiling
chemical Changes of Matter
Fireworks;
explosions
chemical Changes of Matter
Fire;
combustion
chemical Changes of Matter
Rusting;
oxidation
Evidences of change: how do you know?
Physical
chemical
• Color changes (careful!)
• Color changes (careful!)
• Identity is not changed;
just size and shape
• Fizzing, foaming or bubbles
• Change of state
(solid, liquid or gas)
• Dissolving
• Bending, crushing,
mixing, cutting, etc.
• Reversible?
• Change in temperature
(hotter or colder)
• Production of sound,
light or odor
• Production precipitate
(solid made from 2 liquids)
• Not reversible !
Physical or chemical change?
Leaves
changing
colors
Time to check your red bull and milk…
Answer the following question on the bottom of the page
where you wrote your Blendspace notes.
What has happened
to your red bull and
milk?
Is this a physical or
chemical change?

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