Mg + O2 = MgO

Balanced Chemical Equation – Solution

2Mg + O2 → 2MgO

The coefficients show the number of particles (atoms or molecules), and the indices show the number of atoms that make up the molecule. New substances are formed as a result of the rearrangement of the original atoms. As a result of a chemical reaction, atoms of chemical elements do not disappear anywhere and new ones do not appear, their number remains unchanged – this follows from the law of conservation of mass of substances.

Chemical Reaction Information

Magnesium + Dioxygen = Magnesium Oxide

This is an oxidation-reduction (redox) reaction. Mg is a reducing agent, O2 is an oxidizing agent.

  • 2 Mg0  4 e  2 MgII (oxidation)
  • 2 O0 + 4 e  2 O-II (reduction)

Reaction Type


Substances that react are called starting materials or reactants. The substances that form as a result are called reaction products.



  • Names: Magnesium.
  • Appearance: Grey powder.


  • Names: Dioxygen, Oxygen.
  • Appearance: Odourless compressed gas.


MgO – Magnesium oxide

  • Other names: Magnesia.
  • Appearance: White powder; Hygroscopic fine white powde.
Similar Examples of Equalizing a Chemical Reaction
O2 + Mg → MgO + e
O2 + H2 + Mg → Mg(OH)2
O2 + Mg → Mg2O2
O2 + Mg + N2 → MgO + Mg3N2
O2 + Mg → MgO4
O2 + Mg → Mg2O7
O2 + CO2 + Mg → MgCO3
H2O + O2 + Mg → Mg(OH)2
O2 + Mg → OMg
O2 + Mg + (NH4)2Cr2O7 → H2O + N2 + MgO + Cr2O3
O2 + Mg → Mg2O
O2 + Mg → MgO
O2 + Mg → MgO2
O2 + Mg → MgO3

Alexander Stephenson

Candidate of Chemical Sciences, editor-in-chief of Lecturer at several international online schools, member of the jury of chemistry competitions and author of scientific articles.

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