3 SiO2 + 4 Al → 2 Al2O3 + 3 Si

This is an oxidation-reduction (redox) reaction:

3 SiIV + 12 e- → 3 Si0 (reduction)

4 Al0 - 12 e- → 4 AlIII (oxidation)

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

Reactants:

  • SiO2
    • Al
      • Names: Aluminum source: wikidata, accessed: 2019-09-07source: NIOSH NPG, accessed: 2019-09-02, Aluminium powder source: ICSC, accessed: 2019-09-04, Al source: wikidata, accessed: 2019-09-07
      • Appearance: Silvery-white-to-grey powder source: ICSC, accessed: 2019-09-04; Silvery-white, malleable, ductile, odorless metal. source: NIOSH NPG, accessed: 2019-09-02

    Products:

    • Al2O3
      • Names: Aluminium oxide (Aluminum oxide) source: wikipedia, accessed: 2019-09-27, Aluminum oxide source: wikidata, accessed: 2019-09-02, Aluminium oxide source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-02
      • Appearance: White solid source: wikipedia, accessed: 2019-09-27; White powder source: ICSC, accessed: 2019-09-04; White, odorless, crystalline powder. source: NIOSH NPG, accessed: 2019-09-02
    • 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