№7
1) CaO+H2O = Ca(OH)2
2) Ca(OH)2+CO2 = CaCO3+H2O
3) K2O + 2 HCl = 2 KCl + H2O
4) Li2O+2 HNO3 = 2 LiNO3+H2O
5) SO2+ 2 NaOH = Na2SO3+H2O
6) SO3 + 2 KOH = K2SO4+H2O
№8
H2O->O2->SO2->H2SO3
2 H2O = 2 H2+O2
S+O2 = SO2
SO2+H2O = H2SO3
H2O->O2->K2O->KOH
2 K+O2 = 2 K2O
K2O+H2O = 2 KOH
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Answers & Comments
№7
1) CaO+H2O = Ca(OH)2
2) Ca(OH)2+CO2 = CaCO3+H2O
3) K2O + 2 HCl = 2 KCl + H2O
4) Li2O+2 HNO3 = 2 LiNO3+H2O
5) SO2+ 2 NaOH = Na2SO3+H2O
6) SO3 + 2 KOH = K2SO4+H2O
№8
H2O->O2->SO2->H2SO3
2 H2O = 2 H2+O2
S+O2 = SO2
SO2+H2O = H2SO3
H2O->O2->K2O->KOH
2 H2O = 2 H2+O2
2 K+O2 = 2 K2O
K2O+H2O = 2 KOH