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
Answers
Answer:
Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils. Metals are good conductors of heat and electricity. Therefore, immersion rods for heating liquids are made of metallic substances.
Answer:
a) Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils. Metals are good conductors of heat and electricity.
b) Immersion rods are made up of metallic substances because metals are good conductors of heat and electricity. They get hot very soon and allow to passage of current and warm water.
c) Copper is less reactive than zinc. Therefore, it cannot displace zinc from its salt solution.
d) Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
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