Question

Why calcium and magnesium floats in water when it reacts with?

Answer 1

The reaction of calcium with water is not very violent. SO, the heat released is not sufficient for the hydrogen to catch fire. Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the metal and hence caclium floats on water.....

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Answer 2

during reaction of calcium and magnesium with water , hydrogen gas is released which surrounds Ca and Mg thus they float in water.

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