№1
Li2O->LiOH->Li2O->Li2CO3
Li2O+H2O=2 LiOH
2 LiOH=Li2O+H2O
Li2O+CO2↑=Li2CO3
№2
Na2O->NaOH->NH4OH->NH3
Na2O+H2O=2 NaOH
NaOH+NH4Cl=NaCL+NH4OH
NH4OH=NH3+H2O
№3
CuO->Cu(NO3)2->Cu(OH)2->CuO
CuO+2 HNO3=Cu(NO3)2+H2O
Cu(NO3)2+2 NaOH=Cu(OH)2↓+2 NANO3
Cu(OH)2=CuO+H2O
№4
Na2O->Na2CO3->NaCl->NaNO3->NaNO2
Na2O+CO2=Na2CO3
Na2CO3+2 HCl=2 NaCl+CO2↑+H2O
NaCl + AgNO3 = NaNO3 + AgCl↓
2 NaNO3=2 NaNO2+O2
№5
CO2->Na2CO3->CO2->CaCO3->CaCl2->Ca(OH)2->CaO
Na2O+CO2↑=Na2CO3
Na2CO3=Na2O+CO2↑
CaO+CO2↑=CaCO3
CaCO3+2 HCl=CaCl2+CO2↑+H2O
CaCl2+2 NaOH=Ca(OH)2+2 NaCl
№6
CuO->CuCl2->A->CuO->CuSO4->Cu
CuO+2HCl=CuCl2+H2O
CuCl2+2 NaO=Cu(OH)2↓+2 NaCl
Cu(OH)2=CuO+H2O
CuO+H2SO4=CuSO4+H2O
CuSO4+H2=Cu+H2SO4
A-Cu(OH)2