Metals which react
violently with cold water are potassium (K) and sodium (Na).
2K + 2H2O®2KOH + H2 + Heat energy
+ 2H2O ® 2NaOH + H2
+ Heat energy
hydrogen gas produced during the reactions of these two metals with water
immediately catches fire. Thus, these reactions are violent and exothermic.
gas evolved during these reactions burns with a popping sound which confirms
that the gas is hydrogen (H2).
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