Question

Gicen Given below are situations which make use of some physical properties of metals. Complete the table.

Use property

to make electric
wires

To make aluminium foils
to wrap food materials

To make utensil

to make farming tools

to make bells using in
places of worship​

Answer 1

Answer:

1) Copper

2) Aluminium

3) Aluminium, Copper

4) Iron

5) Bronze

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Explanation:

REASONS AND EXPLANATION

1) Copper is a good conductor of electricity and can be drawn into wires easily.

2) Aluminium is malleable so it can be drawn into sheets easily.

3) As they don't get corroded easily when in contact with moisture or water.

4) As it is strong and cheap for that purpose.

5) As it is more sonorous in nature.

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Answer 2

Explanation:

a) Aluminium is one of the less reactive metals, so it does not react with food items and does not alter the taste. Moreover, being a metal; aluminium is highly malleable and can be made into very thin foils which are perfect for wrapping food.

b) Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity. The immersion rod needs an electric supply to get heated and in turn to heat liquids.

c) Copper is less reactive than zinc. This can be confirmed from the electrochemical or activity series in which Zn has a lower reduction potential than Cu. This means Zn is more reactive than Cu. This is the reason, copper cannot displace zinc from its salt solution.

d) Sodium and potassium are highly reactive metals. If kept in open, they readily react with oxygen in the atmosphere. The reaction is so quick that sodium and potassium easily catch fire when exposed to air. To prevent accidental fire, they are stored in kerosene.