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