Na + O2 = Na2O

Balanced Chemical Equation – Solution

4Na + O2 → 2Na2O

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

Sodium + Dioxygen = Sodium Oxide

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

  • 4 Na0  4 e  4 NaI (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: Sodium.
  • Appearance: Silvery solid in various forms.


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


Na2O – Sodium oxide

  • Other names: Disodium oxide.
  • Appearance: White solid.
Similar Examples of Equalizing a Chemical Reaction
O2 + Na → Na2O
O2 + Na → Na2O5
O2 + Na → Na2O + Na2O2
O2 + Na → NaO
O2 + Na → NaO2
O2 + Na → Na2O3
O2 + Na → Na2O2
O2 + Na → Na3O
O2 + Na → Na2O22Na
H2O + O2 + CO2 + Na → NaHCO3

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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