8th std science Chapter 7 metals and nonmetals question answer| class 8 science chapter 7 |Exercise
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metal non metal question answer
1. Complete the table
Property of metal
i. Ductility
ii. Malleability
iii. Conduction of heat
iv. Conduction of electricity
v. Sonority
2. Identify the odd term
a. Gold, silver, iron, diamond
brittelness,
b. Ductility,
malleability
Exercises
Use in everyday life
sonority,
c. Carbon, bromine, sulphur, phosphorus
d. Brass, bronze, iron, steel
3. Write scientific reasons.
a. The stainless steel vessels in kitchen
have copper coating on the bottom.
b. Copper and brass vessels are cleaned
with lemon.
c. Sodium metal is kept in kerosene.
4. Answer the following.
a. What is done to prevent corrosion of
metals?
b. What are the metals that make the alloys
brass and bronze?
c. What are the adverse effects of corrosion?
d. What are uses of Noble metals?
53
5. Three experiments to study the process
of rusting are given below. Observe the
three test tubes and answer the following
questions.
air
oil
water
rusted
nail
Test tube 1 Test tube 2 Test tube 3
boiled
water
dry air
calcium
chloride
a. Why the nail in the test tube 2 is not
rusted?
b. Why is the nail in the test tube 1 is rusted
highly?
c. Would the nail in the test tube 3 get
rusted ?
JV2TZY
Project:
How is the 'Varkha' or sliver foil used in
sweets made ? Collect the information
about which metals are used to make
'Varkha'.
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