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a) S + O2 \(\underrightarrow{to}\) SO2
2SO2 + O2 \(\underrightarrow{to}\) 2SO3
SO3 + H2O → H2SO4
H2SO4 + 2NaOH → Na2SO4 + 2H2O
Na2SO4 + BaCl2 → BaSO4↓ + 2NaCl
a;
S + O2 -> SO2
2SO2 + O2 -> 2SO3
SO3 + H2o -> H2SO4
Fe + H2SO4 -> FeSO4 + H2
H2 + S -> H2S
2H2S + 3O2 -> 2SO2 + 2H2O
SO2 + 2Mg -> 2MgO + S
S + 2Na -> Na2S
Na2S + 2HCl -> 2NaCl + H2S
H2S + CuO -> CuS + H2O
b;
Cl2 + H2 -> 2HCl
Fe + 2HCl -> FeCl2 + H2
2FeCl2 + Cl2 -> 2FeCl3
2FeCl3 + Fe -> 3FeCl2
FeCl2 + 2AgNO3 -> Fe(NO3)2 + 2AgCl
Fe(NO3)2 + 2NaOH -> Fe(OH)2 + 2NaNO3
4Fe(OH)2 + O2 -> 2Fe2O3 + 4H2O
Fe2O3 + 3CO -> 2Fe + 3CO2
2Fe + 3Cl2 -> 2FeCl3
FeCl3 + 3AgNO3 -> Fe(NO3)3 + 3AgCl
4Fe(NO3)3 -> 2Fe2O3 + 12NO2 + 3O2
Fe2O3 + 6HNO3 -> 2Fe(NO3)3 + 3H2O
a, Fe + 2HCl \(\rightarrow\) FeCl2 + H2
FeCl2 + 2NaOH \(\rightarrow\) Fe(OH)2 + 2NaCl
Fe(OH)2 \(\rightarrow\) FeO + H2O
FeO + CO \(\rightarrow\) Fe + CO2
b, 2Fe + 3Cl2 \(\rightarrow\) 2FeCl3
FeCl3 + 3NaOH \(\rightarrow\) Fe(OH)3 + 3NaCl
2Fe(OH)3 + 3H2SO4 \(\rightarrow\) Fe2(SO4)3 + 6H2O
c, 4Al + 3O2 \(\rightarrow\) 2Al2O3
Al2O3 + 6HCl \(\rightarrow\) 2AlCl3 + 3H2O
AlCl3 + 3AgNO3 \(\rightarrow\) Al(NO3)3 + 3AgCl
Al(NO3)3 + 3NaOH \(\rightarrow\) Al(OH)3 + 3NaNO3
2Al(OH)3 \(\rightarrow\) Al2O3 + 3H2O
d, 2Na + 2H2O \(\rightarrow\) 2NaOH + H2
NaOH + HCl \(\rightarrow\) NaCl + H2O
NaCl + AgNO3 \(\rightarrow\) NaNO3 + AgCl
e, 2Ca + O2 \(\rightarrow\) 2CaO
CaO + H2O \(\rightarrow\) Ca(OH)2
Ca(OH)2 + 2AgNO3 \(\rightarrow\) Ca(NO3)2 + 2AgOH
Ca(NO3)2 + H2SO4 \(\rightarrow\) CaSO4 + 2HNO3
Bạn tự cân bằng các phương trình nhé
Fe+Cl2->FeCl3(đk nhiệt độ)
FeCl3+NaOH->NaCl+Fe(OH)3
Fe(OH)3+H2SO4->Fe2(SO4)3+H2O
Fe(OH)3->Fe2O3+H2O(điều kiện nhiệt độ)
Fe2O3+CO(dư)->Fe+CO2(đk nhiệt độ)
b)Al+Cl2->AlCl3
AlCl3+NaOH(vừa đủ)->Al(OH)3+NaCl
Al(OH)3+H2SO4->Al2(SO4)3+H2O
Al(OH)3->Al2O3+H2O(đk nhiệt độ)
Al2O3->Al+O2(điện phân nóng chảy criolit)
S+O2->SO2(đk nhiệt độ)
SO2+Br2+H2O->H2SO4+HBr
H2SO4+BaO->BaSO4+H2O
H2SO4(đặc)+Cu->CuSO4+SO2+H2O
a) Cu + O2\(\rightarrow\) CuO
CuO + HCl\(\rightarrow\) CuCl2 + H2O
CuCl2 + NaOH\(\rightarrow\)Cu(OH)2 + NaCl
Cu(OH)2 + H2SO4\(\rightarrow\)CuSO4 + H2O
CuSO4 + Fe\(\rightarrow\) FeSO4 + Cu
b) Fe + Cl2 \(\rightarrow\) FeCl3
FeCl3 + NaOH\(\rightarrow\) Fe(OH)3 + NaCl
Fe(OH)3 \(\underrightarrow{nhietphan}\) Fe2O3 + H2O
Fe2O3 + H2SO4 \(\rightarrow\) Fe2(SO4)3 + H2O
Fe2(SO4)3 + BaCl2 \(\rightarrow\)FeCl3 + BaSO4
c) Fe + Cl2 \(\rightarrow\) FeCl3
FeCl3 + NaOH\(\rightarrow\) Fe(OH)3 + NaCl
Fe(OH)3\(\underrightarrow{nhietphan}\) Fe2O3 + H2O
Fe2O3 + CO\(\underrightarrow{^{to}}\) Fe + CO2
Fe + HCl \(\rightarrow\) FeCl2 + H2
d) Al + O2 \(\rightarrow\) Al2O3
Al2O3 + HCl\(\rightarrow\)AlCl3 + H2O
AlCl3 + NaOH \(\rightarrow\)Al(OH)3 + NaCl
Al(OH)3 \(\underrightarrow{nhietphan}\) Al2O3 + H2O
Al2O3 \(\underrightarrow{nhietphan}\) Al + O2
I.
a) pt
1) 4Al + 3O2 \(\underrightarrow{to}\) 2Al2O3
2) Al2O3 + 3H2SO4 -> Al2(SO4)3 + 3H2O
3) Al2(SO4)3 + 3BaCl2 -> 2AlCl3 + 3BaSO4
4) AlCl3 + 3NaOH -> Al(OH)3 + 3NaCl
5) 2Al(OH)3 + 3Cu(NO3)2 -> 2Al(NO3)3 + 3Cu(OH)2
6) 2Al(NO3)3 + 3Mg -> 3Mg(NO3)2 + 2Al
7) 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
8) Al2(SO4)3 + 6KOH -> 2Al(OH)3 + 3K2SO4
9) 2Al(OH)3 \(\underrightarrow{to}\) Al2O3 + 3H2O
10) 2Al2O3 \(\underrightarrow{đpnc}\) 4Al + 3O2
11) 2Al + 2NaOH + 2H2O -> 2NaAlO2 + 3H2
b) pt:
1) Fe + 2HCl -> FeCl2 + H2
2) FeCl2 + Zn -> ZnCl2 + Fe
3) Fe + H2SO4 -> FeSO4 + H2
4) FeSO4 + 2NaOH -> Fe(OH)2 + Na2SO4
5) Fe(OH)2 \(\underrightarrow{to}\) FeO + H2O
6) FeO + H2 \(\underrightarrow{to}\) Fe + H2O
7) 2Fe + 3Cl2 \(\underrightarrow{to}\) 2FeCl3
8) 2FeCl3 + 3Ba(OH)2 -> 2Fe(OH)3 + 3BaCl2
9) 2Fe(OH)3 \(\underrightarrow{to}\) Fe2O3 + 3H2O
10) Fe2O3 + 3H2 \(\underrightarrow{to}\) 2Fe + 3H2O
11) 3Fe + 2O2 \(\underrightarrow{to}\) Fe3O4
12) Fe3O4 + 4CO \(\underrightarrow{to}\) 3Fe + 4CO2
13) 2Fe + 6H2SO4( đặc nóng) \(\underrightarrow{to}\) Fe2(SO4)3 + 6H2O + 3SO2
1)
\(2Fe\left(OH\right)_3\) -> \(Fe_2O_3\) + \(3H_2O\)
\(Fe_2O_3\) + \(3CO\) -> \(2Fe\) + \(3CO_2\)
\(2Fe+3Cl_2\) -> \(2FeCl_3\)
\(FeCl_3+3AgNO_3\) -> \(3AgCl\) +\(Fe\left(NO_3\right)_3\)
2)
\(4FeS+7O_2\) -> \(2Fe_2O_3+4SO_2\)
\(Fe_2O_3+3CO\) -> \(2Fe+3CO_2\)
\(2Fe+3Cl\) ->\(2FeCl_3\)
\(2FeCl_3+3Ba\left(OH\right)_2\)->\(3BaCl_2+2Fe\left(OH\right)_3\)
3)
\(2Fe+3Cl_2\) -> \(2FeCl_3\)
\(2FeCl_3+3Ba\left(OH\right)_2\) -> \(3BaCl_2+2Fe\left(OH\right)_3\)
\(2Fe\left(OH\right)_3\) -> \(Fe_2O_3+3H_2O\)
\(Fe_2O_3+3CO\) -> \(2Fe+3CO_2\)
4)
\(2Cu+O_2\) -> \(2CuO\)
\(CuO+2HCl\) -> \(CuCl_2+2H_2O\)
\(CuCl_2+2NaOH\) -> \(2NaCl_2+Cu\left(OH\right)_2\)
\(Cu\left(OH\right)_2+H_2SO_4\) -> \(2H_2O+CuSO_4\)
Trả lời:
a, PTHH:
Fe + HCl → FeCl2 + H2↑
FeCl2 + Cl2 → FeCl3
FeCl3 + 3 NaOH → Fe(OH)3↓ + 3 NaCl
Fe(OH)3 \(\underrightarrow{t^o}\) Fe2O3 + H2O
Fe2O3 + CO \(\underrightarrow{t^o}\) Fe + CO2↑
CO2 + NaOH → Na2CO3 + H2O
Na2CO3 + BaCl2 → NaCl + BaCO3↓
NaCl + AgNO3 → AgCl↓ + NaNO3
a)Fe+2HCl→FeCl2+H2
2FeCl2+Cl2→2FeCl3
Fe+FeCl3→2FeCl2
FeCl3+3NaOH→Fe(OH)3+3NaCl
2Fe(OH)3→toFe2O3+3H2O
Fe2O3+3CO→2Fe+3CO2
CO2+2NaOH→Na2CO3+H2O
Na2CO3+BaCl2→BaCO3↓+2NaCl
NaCl+AgNO3→AgCl↓+NaNO3
b)FeS+2HCl→FeCl2+H2S
H2S+Cu(OH)2→CuS+2H2O
2CuS+3O2→2CuO+2SO2
SO2+2Mg→2MgO+S
S+O2→SO2