Question

Name two metal that react violently with cold water any three observations you would make when such a metal is dropped into water. how would you identity the gas evolved, if any, during the reaction?

Answer 1

Metals which react violently with cold water are potassium (K) and sodium (Na).



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).

Answer 2

Metals which react violently with cold water are potassium (K) and sodium (Na).
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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 w hich confirms that the gas is hydrogen (H2).