Mg + 2 H2O → MgO2 + 2 H2

This is an oxidation-reduction (redox) reaction:

4 HI + 4 e- → 4 H0 (reduction)

Mg0 - 2 e- → MgII (oxidation)

2 O-II - 2 e- → 2 O-I (oxidation)

H2O is an oxidizing agent, Mg is a reducing agent, H2O is a reducing agent.

Reactants:

  • Mg
    • Names: Magnesium source: wikidata, accessed: 2019-09-07, Magnesium (powder) source: ICSC, accessed: 2019-09-04, Magnesium (pellets) source: ICSC, accessed: 2019-09-04
    • Appearance: Grey powder source: ICSC, accessed: 2019-09-04; Silvery-white metallic solid in various forms source: ICSC, accessed: 2019-09-04
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27

Products:

  • MgO2 – Magnesium peroxide source: wikipedia, accessed: 2019-09-27
    • Other names: Magnesium dioxide source: wikipedia, accessed: 2019-09-27, Magnesium bioxide source: wikipedia, accessed: 2019-09-27, UN 1476 source: wikipedia, accessed: 2019-09-27
    • Appearance: White or off-white powder source: wikipedia, accessed: 2019-09-27
  • H2
    • Names: Dihydrogen source: wikidata, accessed: 2019-09-07, Hydrogen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, H2 source: wikidata, accessed: 2019-09-07
    • Appearance: Odourless colourless compressed gas source: ICSC, accessed: 2019-09-04