Explain why calcium metal starts floating on the surface of water after reacting with it. Write the chemical equation for the reaction.
(N/A) Calcium reacts with water to form calcium hydroxide and hydrogen gas. The hydrogen gas produced during the reaction forms bubbles that stick to the surface of the calcium metal,causing it to float.
$Ca(s) + 2H_2O(l) \to Ca(OH)_2(aq) + H_2(g)$
$Ca(s) + 2H_2O(l) \to Ca(OH)_2(aq) + H_2(g)$
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