Enfant
India International School
Class 8th Sub.Chemistry. M.M.40
Section
-A
1.
Fill in blanks (1×5=5)
(a) An atom is electrically _________
(b) ___________ discovered the electrons.
(c) Matter can be classified into _______ and _______
(d) Rusting of iron is a ______change .
(e) Most physical changes are _________
2.
Define these terms . (1×5=5)
(a) Periodic
change
(b) Reversible
change
(c) Irreversible
change
(d) Physical
change
(e) Chemical
change
3.
Differentiate between the
following. (2×5=10)
(a) Fast
and slow changes
(b) Periodic
and nonperiodic changes
(c) Physical
and chemical changes
(d) Exothermic
and endothermic changes
(e) Reversible and irreversible changes
Section -B
4.
Classify the following as
physical or chemical change . (1×8=8)
(a) Boiling
of water
(b) Burning
of coal
(c) Rotting
of eggs
(d) Melting
of ice
(e) Breaking
of glass
(f) Digestion
of food
(g) Formation
of vapours
(h) Formation
of curd from milk
5.
Answer the following
questions . (2×6=12)
(a) Define
atomicity.
(b) Give
an example of a gas -liquid type of homogeneous mixture.
(c) What
happens when an electricity is passed through water?
(d) Define
matter .
(e) What
is meant by a solid ? Mention its three properties.
(f) Mention
the state of matter which can flow.
