Metals like aluminium, iron, and zinc do not react with cold or hot water, but they react with steam to form the metal oxide and hydrogen.

Magnesium starts floating when it reacts with hot water because the bubbles of hydrogen gas formed during the reaction stick to its surface, reducing its density and causing it to float.

Calcium starts floating because the bubbles of hydrogen gas formed during the reaction stick to the surface of the metal, reducing its density and causing it to float.

No, not all metals react with water. Metals like potassium, sodium, and calcium react with water, but others may not. The reactivity of metals with water varies depending on their position in the reactivity series. Metals like gold and silver, ...

Metal oxides soluble in water dissolve in it to form metal hydroxides.