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![](https://rs.olm.vn/images/avt/0.png?1311)
3Fe + 2O2 ➝ Fe3O4
Fe3O4 + 8HCl ➝ FeCl2 + 2FeCl3 + 4H2O
2FeCl2 + Cl2 ➝ 2FeCl3
FeCl3 + 3AgNO3 ➝ Fe(NO3)3 + 3AgCl↓
Fe(NO3)3 + 3NaOH ➝Fe(OH)3 + 3NaNO3
2Fe(OH)3 \(\underrightarrow{t^o}\) Fe2O3 + 3H2O
![](https://rs.olm.vn/images/avt/0.png?1311)
a) SO2 + Na2O -> Na2SO3
Na2SO3 + H2SO4 -> Na2SO4 + SO2 + H2O
Na2SO4 + Ba(OH)2 -> BaSO4 \(\downarrow\)+ 2NaOH
2NaOH + CO2 -> Na2CO3 + H2O
b) CaO + CO2 -> CaCO3
CaCO3 \(\rightarrow^{t^o}\) CaO + CO2
CaO + H2O -> Ca ( OH)2
Ca ( OH)2 + CO2 -> CaCO3 + H2O
CaCO3 + H2SO4 -> CaSO4 + CO2 + H2O
c) 2Fe + 3Cl2 \(\rightarrow^{t^o}\) 2FeCl3
FeCl3 + 3NaOH -> Fe(OH)3 \(\downarrow\) + 3NaCl
2Fe(OH)3 \(\rightarrow^{t^o}\) Fe2O3 + 3H2O
Fe2O3 + 3H2SO4 -> Fe2(SO4)3 + 3H2O
Fe2(SO4)3 + 3BaCl2 -> 2FeCl3 + 3BaSO4\(\downarrow\)
d) Fe + 2HCl -> FeCl2 + H2
FeCl2 + 2AgNO3 -> 2AgCl\(\downarrow\) + Fe(NO3)2
Fe(NO3)2 + 2NaOH -> Fe(OH)2\(\downarrow\) + 2NaNO3
Fe(OH)2 + H2SO4 -> FeSO4 + 2H2O
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\\ \left(1\right)Fe+Cu\left(NO_3\right)_2\rightarrow Fe\left(NO_3\right)_2+Cu\\ \left(2\right)Fe\left(NO_3\right)_2+2KOH\rightarrow Fe\left(OH\right)_2\downarrow+2KNO_3\\ \left(3\right)Fe\left(OH\right)_2+2HCl\rightarrow FeCl_2+2H_2O\)
\(\left(4\right)FeCl_2\) \(\rightarrow\left(đpdd\right)\) \(Fe+Cl_2\)
\(b,\\ \left(1\right)2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ \left(2\right)FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\downarrow\\ \left(3\right)Fe\left(NO_3\right)_3+3KOH\rightarrow Fe\left(OH\right)_3+3KNO_3\\ \left(4\right)2Fe\left(OH\right)_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\)
![](https://rs.olm.vn/images/avt/0.png?1311)
+) \(CaC_2+2H_2O\rightarrow C_2H_2+Ca\left(OH\right)_2\)
+) \(C_2H_2+H_2\rightarrow C_2H_4\)
+) \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
+) \(C_2H_4Br_2+2H_2O\rightarrow C_2H_4\left(OH\right)_2+2HBr\)
Ở pthh 2 thiếu đk: \(C_2H_2+H_2\underrightarrow{t^o,Pd}C_2H_4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 3 :
4FeS + 7O2 --t--> 2Fe2O3 + 4SO2
Fe2O3 + 6HNO3 -> 2Fe(NO3)3 + 3H2O
Fe(NO3)3 + 3 NaOH -> Fe(OH)3 +3NaNO3
2Fe(OH)3 --t--> Fe2O3 + 3H2O
Fe2O3 + 3H2 -t-> 2Fe + 3H2O
Fe + S -t-> FeS
1, FeCl3 + 3KOH → Fe(OH)3 + 3KCl
2Fe(OH)3 \(\underrightarrow{t^o}\)Fe2O3 + 3H2O
Fe2O3 + 3H2 \(\underrightarrow{t^o}\) 2Fe + 3H2O
3Fe + 2O2 \(\underrightarrow{t^o}\) Fe3O4
2, 2Ca + O2 \(\underrightarrow{t^o}\) 2CaO
CaO + H2O → Ca(OH)2
Ca(OH)2 + CO2 → CaCO3 + H2O
CaCO3 + H2O + CO2→ Ca(HCO3)2
Ca(HCO3)2 + 2HCl → CaCl2 + 2H2O + 2CO2
CaCl2 + Ca(OH)2 → 2CaO + 2HCl
3, 4FeS + 7O2 \(\underrightarrow{t^o}\) 2Fe2O3 + 4SO2
Fe2O3 + 6HNO3 → 2Fe(NO3)3 + 3H2O
Fe(NO3)3 + 3KOH → Fe(OH)3 + 3KNO3
2Fe(OH)3 \(\underrightarrow{t^o}\) Fe2O3 + 3H2O
Fe2O3 + 3H2 \(\underrightarrow{t^o}\) 2Fe + 3H2O
Fe + S \(\underrightarrow{t^o}\) FeS
![](https://rs.olm.vn/images/avt/0.png?1311)
\(MgSO_4+BaCl_2\rightarrow MgCl_2+BaSO_4\)
\(MgCl_2+2KOH\rightarrow Mg\left(OH\right)_2+2KCl\)
\(Mg\left(OH\right)_2\underrightarrow{t^o}MgO+H_2O\)
\(MgO+2HNO_3\rightarrow Mg\left(NO_3\right)_2+H_2O\)
\(Mg\left(NO_3\right)_2+K_2CO_3\rightarrow2KNO_3+MgCO_3\)
\(MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2\)
\(MgCl_2+2KOH\rightarrow Mg\left(OH\right)_2+2KCl\)
![](https://rs.olm.vn/images/avt/0.png?1311)
FeCl3+3NaOH→Fe(OH)3+3NaCl
2Fe(OH)3→Fe2O3+3H2O
Fe203+3CO→2Fe+3CO2
Fe+H2SO4→FeSO4+H2
FeCl3 + 3NaOH ➜ Fe(OH)3 + 3NaCl
2Fe(OH)3 ➜ Fe2O3 + 3H2O
Fe2O3 + 3CO ➜ 2Fe + 3CO2
Fe + CuSO4 ➜ FeSO4 + Cu
![](https://rs.olm.vn/images/avt/0.png?1311)
2Cu + O2 ➝ 2CuO
CuO + H2SO4 ➝ CuSO4 + H2O
CuSO4 + BaCl2 ➝ CuCl2 + BaSO4↓
CuCl2 + 2AgNO3 ➝ Cu(NO3)2 + 2AgCl↓
Cu(NO3)2 +2NaOH➝Cu(OH)2↓+ 2NaNO3
Cu(OH)2 \(\underrightarrow{t^o}\)CuO + H2O
CuO + H2 ➝ Cu + H2O
Cu + 2H2SO4(đ) \(\xrightarrow[]{t^o}\) CuSO4 + SO2 + 2H2O
CuSO4 + Fe ➝ Cu + FeSO4
Cu + 2H2SO4(đ) \(\xrightarrow[]{t^o}\) CuSO4 + SO2 + 2H2O
\(Fe\left(OH\right)_2+2HCl\rightarrow FeCl_2+2H_2O\\ 2FeCl_2+Cl_2\rightarrow2FeCl_3\)