Question

EXERCISE
wise
and
8.
Fill in the blanks:
(a) The change of a solid into a liquid is called
med
od
the
en
(b) The process in which a solid directly
changes into gas is called .....
(e) The change of water vapour into water is
called .........
The temperature at which a liquid starts
changing into its vapour state is
9. Give two examples for each of the following:
(a) The substances which sublime.
(b) The substances which do not change their
state on heating.
Define
the thermoss
1a) matter they thing
) intermolecular forces of attraction -
What are the three states of matter? Define each
of them with two examples.
Define interconversion of states of matter. What
are the two factors responsible for the change of
state of matter ?
State the main postulates of kinetic theory of
matter
What happens to water if
(a) it is kept in a deep freezer ?
(b) it is heated ?
Explain the phenomenon of change of state
of water
a) State the law of conservation of mass.
(b) What do you observe when barium chloride
solution is mixed with sodium sulphate
solution ?
7. Give reasons :
(a) A gas can fill the whole vessel in which it
is enclosed.
(b) Solids cannot be compressed.
(c) Liquids can flow.
(d) When magnesium is burnt in air, there is
an increase in mass after the reaction.
12.
10. Define :
(b) Brownian motion
(a) Diffusion.
11. When sodium chloride is added to a definite
volume of water and stirred well, a solution is
formed, but there is no increase in the level of
water. Why?
What do you observe when a gas jar which
appears empty is inverted over a gas jar
containing Bromine vapours ? Name the
phenomenon.
13.
Why can a piece of chalk be broken easily into
smaller pieces while a coal piece cannot be
broken easily?​

Answer 1

Answer:

8 (a) fusion

(b) sublimation

e) condensation,

evaporation

9 a) sublimation of ammonium chloride and Napthelene balls

Answer 2

Answer:

Answer:

8 (a) fusion

(b) sublimation

e) condensation,

evaporation

9 a) sublimation of ammonium chloride and Napthelene balls

Explanation: