Question

magnesium reacts with water to form

Answer 1

Mg + H₂O ----------> MgO + H₂

Magnesium reacts with water to form magnesium oxide and hydrogen gas.

Observation:
Burns with a dazzling white light
Residue:
White coating of Magnesium Oxide.

(note:The thing is that it needs a lot of heat in order to re-create the first reaction more than water as liquid can take)

Answer 2

Mg reacts with H2O (steam) to form Mg(s) + 2H2O(g) → Mg(OH)2(aq) + H2(g)