Name two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reaction?
Two metals which react violently with cold water are Sodium and Potassium. The three observation made during that time are:-
1) Little explosions takes place on the surface of water and ultimately catches fire as the metal moves to the surface of water.
2) A pop sound is produced indicating that it is hydrogen.