2 H2 + SiO2 → Si + 2 H2O

This is an oxidation-reduction (redox) reaction:

SiIV + 4 e- → Si0 (reduction)

4 H0 - 4 e- → 4 HI (oxidation)

SiO2 is an oxidizing agent, H2 is a reducing agent.

Reactants:

  • 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
  • SiO2

    Products:

    • Si
      • Names: Silicon source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Si source: wikidata, accessed: 2019-09-07, Element 14 source: wikidata, accessed: 2019-09-07
      • Appearance: Steel-grey crystals or black-to-brown amorphous powder source: ICSC, accessed: 2019-09-04; Black to gray, lustrous, needle-like crystals. [Note: The amorphous form is a dark-brown powder.] source: NIOSH NPG, accessed: 2019-09-02
    • 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