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2Ca + O2 -> 2CaO
CaO + H2O -> Ca(OH)2
2. 2Ca + O2 -> 2CaO
2Ca + O2 -> 2CaO
3. Ca -> CaCl2 -> Ca3(PO4)2
Ca + Cl2 -> CaCl2
lub
Ca + 2HCl -> CaCl2 + H2
3CaCl2 + 2H3PO4 -> Ca3(PO4)2 + 6HCl