Action nd its
sical and
perties
Question 6 Points 3
Which of the following processes involves change in states of matter?
1. Freezing
II. Combusting
III. Condensing
IV. Decomposing
Ecle
nase
ental
O ll and IV
sttest
S,
O I and IV
O III and IV
55
O land III

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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