C
chungthuychung
CaCl2+Na2CO3--->CaCO3+NaCl
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$CaCO_3----------------to----------->CaO+CO_2$
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CaCl2+Na2CO3--->CaCO3+NaCl
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$CaCl_2+AgNO_3--------->NaNO_3+AgCl$
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$CaCO_3----------------to----------->CaO+CO_2$
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H2+O2--to-->H2O
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$H_2O + Na_2O ------------> 2NaOH $
AgCl+2NH4OH--->2H2O+Ag(NH3)2Cl
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p/s:bạn ra nl vì mk dc hơn 600 bài rồi)