November 2021 1 8 Report
Ca → CaO → Ca(OH)2 → Ca3(PO4)2.
Cu → CuO → CuCl2 → Cu (OH)2 → CuO → Cu.
P → P2O5 → H3PO4 → Ca3(PO4)2.
Si → SiO2 → Na2SiO3 → H2SiO3 → H2SiO3 → SiO2 → Si.
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