Sample Problem 1.1
Distinguishing Between Physical and Chemical Change
PLAN:
Does the substance change composition or just change form?
SOLUTION:
(a) Frost forms as the temperature drops on a humid winter night.
(b) A cornstalk grows from a seed that is watered and fertilized.
(c) Dynamite explodes to form a mixture of gases.
(d) Perspiration evaporates when you relax after jogging.
(e) A silver fork tarnishes in air.
(a) physical change
(b) chemical change
(c) chemical change
(d) physical change
(e) chemical change
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