MgO + H2 → Mg + H2O – Balanced equation

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This is an oxidation-reduction (redox) reaction:

2 H - 2 e^- → 2 H^I (oxidation)

Mg^II + 2 e^- → Mg (reduction)

H₂ is a reducing agent, MgO is an oxidizing agent.

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Reactants:

MgO – Magnesium oxide
- Other names: Magnesia , Periclase , Magnesium oxide fume
- Appearance: White powder ; Hygroscopic fine white powder ; Finely divided white particulate dispersed in air. [Note: Exposure may occur when magnesium is burned, thermally cut, or welded upon.]
H₂
- Names: Dihydrogen , Hydrogen , H2
- Appearance: Odourless colourless compressed gas

Products:

Mg
- Names: Magnesium , Magnesium (powder) , Magnesium (pellets)
- Appearance: Grey powder ; Silvery-white metallic solid in various forms
H₂O – Water, oxidane
- Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
- Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas