Chemistry / Unit 1 Chem 0062 short lesson, about 20 seconds
Physical Change
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The idea
A physical change alters the state, form, or properties of matter without changing the chemical identity of the substance present.
In practice
Melting solid wax into liquid wax changes its form but leaves it chemically the same substance throughout.
Where people slip
A dramatic-looking change is not automatically chemical — grinding a solid into powder can change its color and texture while composition stays identical.
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