PHYSICAL
VS.
CHEMICAL CHANGES 1
Classify the following as
being a chemical or a physical change.
1.
Sodium hydroxide dissolves in water.
2.
Hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and
heat.
3. A pellet
of sodium is sliced in two.
4. Water
is heated and changed to steam.
5.
Potassium chlorate decomposes to potassium chloride and oxygen gas.
6. Iron
rusts.
7. When
placed in water, a sodium pellet catches on fire as hydrogen gas is liberated
and sodium
hydroxide forms.
8.
Evaporation.
9. Ice
melting.
10. Milk
sours.
11.
Sugar dissolves in water.
12. Wood
rotting.
13.
Pancakes cooking on a griddle.
14.
Grass growing in a lawn.
15. A
tire is inflated with air.
16. Food
is digested in the stomach.
17.
Water is absorbed by a paper towel.
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