2 O2 + CaCO3 + Cu2S → CO2 + 2 CuO + CaSO3

This is an oxidation-reduction (redox) reaction:

2 CuI - 2 e- → 2 CuII (oxidation)

S-II - 6 e- → SIV (oxidation)

4 O0 + 8 e- → 4 O-II (reduction)

Cu2S is a reducing agent, Cu2S is a reducing agent, O2 is an oxidizing agent.

Reactants:

  • O2
    • Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04
    • Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04
  • CaCO3 – Calcium carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Calcite; aragonite; chalk; Lime (material); Limestone; marble; oyster; pearl; source: wikipedia, accessed: 2019-09-27, Calcium salt of carbonic acid source: wikidata, accessed: 2019-09-02, Children's Mylanta Upset Stomach Relief source: wikidata, accessed: 2019-09-02
    • Appearance: Fine white powder; chalky taste source: wikipedia, accessed: 2019-09-27; White powder or pellets source: ICSC, accessed: 2019-09-04
  • Cu2S – Copper(I) Sulphide source: wikipedia, accessed: 2019-09-27
    • Other names: Copper(I) sulfide source: wikipedia, accessed: 2019-09-27, Cuprous sulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Chalcocite source: wikipedia, accessed: 2019-09-27

Products:

  • CO2
    • Names: Carbon dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, {{plainlist| source: wikipedia, accessed: 2019-09-27, CO2 source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-27; Odourless colourless compressed liquefied gas source: ICSC, accessed: 2019-09-04; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.] source: NIOSH NPG, accessed: 2019-09-02
  • CuO – Copper(II) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Cupric oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Copper monoxide source: wikidata, accessed: 2019-09-02, Copper oxide source: wikidata, accessed: 2019-09-02
    • Appearance: Black to brown powder source: wikipedia, accessed: 2019-09-27
  • CaSO3 – Calcium sulfite source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Sulfurous acid source: wikipedia, accessed: 2019-09-27, Calcium salt (1:1) source: wikipedia, accessed: 2019-09-27, E226 source: wikipedia, accessed: 2019-09-27
    • Appearance: White solid source: wikipedia, accessed: 2019-09-27