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
Explanation:
a)Aluminium foils are used to wrap food items because aluminium being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets. Moreover it does not react with food items. Immersion rods are made of metallic substances 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 cannot displace zinc from its salt solution because zinc is more reactive than copper. More reactive metal displaces less reactive metal from its salt solution. Zn has displaced copper, but copper cannot do so.
d)Sodium and potassium metals are kept in kerosene or in dry mineral oil. ... In summary, these metals are stored in kerosene because kerosene contains no water and protects these metals from being exposed to any moisture in the air that would cause these metals to react, potentially violently.
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Answer:
a) aluminium foils are used to wrap food items because it prevents food from oxidation and is less reactive to air and water.
b) immersion rods are used for heating liquids because they are good conductors of heat energy.
c) cooper cannot Displace zinc from its salt solution because copper is less reactive than zinc.
d) sodium and potassium are stored in kerosene because they are highly reactive in air and could burn anytime. So, they are stored in kerosene.
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