Question

identify the reactant 2Mg + O2 ----> 2MgO + energy

Answer 1

The reactants are :-

Mg => Magnesium

O => Oxygen

And the product is:-

MgO => Magnesium oxide.

This is a combination reaction where two or more simpler substances form a compound.

When Magnesium is burned in the presence of oxygen, Magnesium oxide is formed.

I hope it helps.

Answer 2

HI !

Reactants are those substances that undergo a chemical reaction.

Here the reactants are Magnesium and Oxygen.

Product is the substance(s) formed when the reactants react in the reaction.
Product = Magnesium Oxide(MgO)