give three reasons why cooper is used to make hot water tanks and not steel.
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Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. That is why copper is used to make hot water tanks, and not steel.
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Complete answer:
Copper and iron both are metals. As iron is more reactive than copper, it readily reacts with the steam of hot water giving corresponding oxides. Copper is rather less reactive and does not combine with hot water steam.
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