Question

Name two metals that starts floating after sometimes when immersed in water explain why

Answer 1

Lithium and sodium float in water because of their low densities. Lithium gradually reacts and disappears, forming a colourless solution of lithium hydroxide whereas sodium (which also forms its corresponding hydroxide) melts almost at once to form a small silvery ball that dashes around the surface

Answer 2

The two metals are:

(i) Calcium (Ca)

(i) Magnesium (Mg)

They start floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the metal.