CaCO3 + 2HCl → CaCl2 + H2O + CO2
NaOH + HCl → NaCl + H2O
4Na + O2 → 2Na2O
CuCl2 + H2S → CuS + 2HCl
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CaCO3 + 2HCl → CaCl2 + H2O + CO2
NaOH + HCl → NaCl + H2O
4Na + O2 → 2Na2O
CuCl2 + H2S → CuS + 2HCl
2K + 2HNO3 → KNO3 + H2