Question

Q.Why does calcium starts floating when it reacts with water ? Write the balanced chemical equation of the reaction?​

Answer 1

Answer:

Explanation:

Metals react with water and produce a metal oxide and hydrogen gas.

The heat evolved is not sufficient for the hydrogen to catch fire.

Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)

Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.

Answer 2

Calcium is a highly reactive metal which reacts with water vigorously to liberate hydrogen gas and heat and calcium oxide

However the heat liberated is not enough for the metal to catch fire. Instead the hydrogen bubbles stick to the metal and thus make the metal float.

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