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Reaction of Metals with Oxygen (Burnt in Air)

what is the r...

Question

what is the reaction when calcium is added to water.And how does calcium float on water.

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Solution

Reaction of calcium with water:
Ca + 2H₂O $\to$ Ca(OH)₂ + H₂

The hydrogen gas released on the reaction of calcium and water. The bubbles of hydrogen gas stick to the surface of unreacted calcium. And as we know gases are less denser than liquid, so that's how the calcium floats in water.

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Reaction of Metals with Oxygen (Burnt in Air)

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