Question

6. Match the columns:

Column 1	Column 2
heat evolved	slow change
burning of fuel	chemical change
new substance formed	periodic change
growth of plant	endothermic
beating of heart	fast change

Answer 1

(A) Heat evolved - (IV) endothermic

The reaction in which the heat is evolved is known as an endothermic reaction.

(B) Burning of fuel - (V) fast change

Burning of fuel is a fast and irreversible change.

(C) New substance formed - (II) chemical change

Chemical changes are the changes in which the chemical properties of a substance are changed and a new substance is formed.

(D) Growth of plant - (I) slow change

The growth of a plant is a slow change because it takes months for a seed to become a plant.

(E) Beating of heart - (III) periodic change

The beating of the heart is a periodic change because it occurs after a fixed interval of time.

Column I	Column II
A. heat evolved	IV. endothermic
B. burning of fuel	V. fast change
C. new substance formed	II. chemical change
D. growth of plant	I. slow change
E. beating of heart	III. periodic change