Write a balanced chemical reaction and give your observation when the following metals react:
Sodium with cold water

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Solution

Observations: Sodium (Na) reacts vigorously with cold water to form sodium hydroxide (NaOH) and hydrogen gas $H_{2}$ with the evolution of heat.
The balanced chemical equation for the reaction is,
$2 N a + 2 H_{2} O (c o l d) \to 2 N a O H + H_{2}$

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