Question

Why does calcium float in water?​

Answer 1

Explanation:

Calcium floats on water because the bubbles of hydrogen gas formed by the reaction of calcium with water stick to the surface of metal.

Answer 2

$\fbox\pink{A}\fbox\blue{n}\fbox\purple{s}\fbox\green{w}\fbox\red{e}\fbox\orange{r}$This is an exothermic reaction, i.e. heat is released. As the reaction proceeds, bubbles of H2 (g) and a white precipitate of Ca(OH)2are formed. The bubbles formed stick to the surface of calcium metal and make it lighter. Therefore, Calcium floats on water.