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
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Answer: Reasons.
(a) Copper metals used for making electric wires because it is thermal resistant, it is inexpensive and also it is ductile.
(b) Graphite is used for making electrode in a cell because it is a good conductor of electricity and also has valence electrons; it is very cheap and also non corrosive.
(c) Immersion rods for heating liquids are made of metallic substances because they are good conductors of electricity and heat. They get heated fast.
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