Question

Classify each of the following as either a physical change or a chemical change:
a. tearing a sheet of paper

b. melting a piece of wax

c. burning a log

d. milk souring

Answer 1

Answer:

physical change

a b c

chemical change

d

Answer 2

A and B are both physical changes. The paper is still paper and the wax is still wax. C and D are both chemical changes. You are changing the log when you burn it. It is no longer a log after it is burned completely and the milk cannot be good after it has went sour. It can’t be changed back.