Question
What happens when:
Sodium metal is dropped in water?

Answer

When Na metal is dropped in water, it reacts violently to form sodium hydroxide and hydrogen gas. The chemical equation involved in the reaction is:
$2\text{Na}_{(\text{s})}+2\text{H}_2\text{O}_{(\text{l})}\xrightarrow{\ \ \ \ \ \ \ }2\text{NaOH}_{(\text{aq})}+\text{H}_{2(\text{g})}$

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What happens when:
  1. Sodium metal is dropped in water.
  2. Sodium metal is dissolved in liquid ammonia.