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Physical Properties of Metals

Give reason f...

Question

Give reason for the following.

(a) Aluminium foils are used to wrap food items.

(b) Immersion rods for heating liquids are made up of metallic substances.

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Solution

a)Aluminium metal is malleable, soft and does not react with food. Therefore, aluminium foils are used to wrap food items.
b)Metals are good conductors of heat and electricity. Therefore, immersion rods for heating liquids are made of metallic substances.

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Q. Give reasons for the following:
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene.

Q. Question 6 (b)
Give reasons for the following.
Immersion rods for heating liquids are made up of metallic substances.

Q. Question 6 (a)
Give reasons for the following.
Aluminium foils are used to wrap food items.

Give reason why :

(a) copper metal is used for making electric wires.

(b) graphite is used for making electrode in a cell.

(c) immersion rods for heating liquids are made of metallic substances.

Q. Give reasons for the following:
(i) Aluminium foils are used to wrap food items.
(ii) Immersion rods for heating liquids are made up of metallic substances.

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