dễ

a, Fe + HCl(dư) ---> FeCl3

FeCl3 + NaOH ---> Fe(OH)3 + naCl

Fe(OH)3 ---> (nhiệt phân)  Fe2O3 + h2O

fe2o3 + h2------> fe + h2o

b,   al2o3 + h2 -------> al + h2o 

Al+ h2SO4 -----------> AL2(SO4)3 + H2

AL2(SO4)3 + BACL2  ----------> alcl3 + baso4

alcl3 + naoh ------> nacl + al(oh)3

TỰ CÂN BẰNG NHA

a,1   2Fe+3Cl2->2FeCl3

   2    FeCl3+NaOH->Fe(OH)3+NaCl

    3   2Fe(OH)3->Fe2O3+3H2O(nhiệt phân)

     4   Fe2O3+3CO->2Fe+3CO2

b,1 2Al2O3->4Al+3O2( điện phân nóng chảy)

          2  2Al+3H2SO4(loãng)->Al2(SO4)3+3H2

          3  Al2(SO4)3+3BaCl2->2AlCl3+3BaSO4

          4  AlCl3+3NaOH->Al(OH)3+3NaCl 

tick nha

(1)Fe+2HCl -> FeCl₂+H₂

(2)FeCl₂ +Ba(OH)₂->Fe(OH)₂+BaCl₂

(3)Fe(OH)₂->(t^o)FeO+H₂O

(4)FeO+H₂->Fe+H₂O

(5)3Fe+2O₂->Fe₃O₄

(6)Fe₃O₄+4CO->3Fe+4CO₂

(7)2Fe+3Cl₂->(t^o)2FeCL₃

(8)FeCl₃+3NaOH->Fe(OH)₃+3NaCl

(9)2Fe(OH)₃+3H₂SO4->Fe₂(SO4)₃+6H₂O

a) Các PTHH:

(1) 2 Fe +3 Cl2 -to-> 2 FeCl3

(2) FeCl3 + 3 NaOH -> Fe(OH)3 +3 NaCl

(3) 2 Fe(OH)3 -to-> Fe2O3 + 3 H2O

(4) Fe2O3 + 3 CO -to-> 2 Fe + 3 CO2

(5) Fe + 2 HCl -> FeCl2 + H2

(6) FeCl2 + 2 AgNO3 -> Fe(NO3)2 + 2 AgCl

b) Các PTHH:

(1) MnO2 + 4 HCl(đặc) -to-> MnCl2 + Cl2 + 2 H2O

(2) 3 Cl2 + 2 Fe -to-> 2 FeCl3

(3) FeCl3 + 3 NaOH -> Fe(OH)3 + 3 NaCl

(4) NaCl + H2O -ddpdddcmnx-> NaOH + 1/2 H2 + 1/2 Cl2

(5) Cl2 + Cu -to-> CuCl2

(6) CuCl2 + 2 AgNO3 -> Cu(NO3)2 + 2 AgCl

c) Các PTHH:

(1) 4 Al + 3 O2 -to-> 2 Al2O3

(2) Al2O3 + 6 HCl -> 2 AlCl3 + 3 H2O

(3) AlCl3 + 3 KOH -> 3 KCl + Al(OH)3

(4) 2 Al(OH)3 -to-> Al2O3 +3 H2O

(5) 2 Al2O3 -đpnc-> 4 Al + 3 O2

a, \(FeCl_3+3NaOH\rightarrow3NaCl+Fe\left(OH\right)_{3\downarrow}\)

\(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)

\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

b, (1) \(Fe+2HCl\rightarrow FeCl_2+H_2\)

 \(FeCl_2+Zn\rightarrow ZnCl_2+Fe\)

\(Fe+H_2SO_{4\left(l\right)}\rightarrow FeSO_4+H_2\)

\(FeSO_4+2NaOH\rightarrow Na_2SO_4+Fe\left(OH\right)_{2\downarrow}\)

\(Fe\left(OH\right)_2\xrightarrow[khongcokhongkhi]{t^o}FeO+H_2O\)

\(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)

(2) \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

\(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)

\(2Fe+6H_2SO_{4\left(đ\right)}\underrightarrow{t^o}Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)

c, \(2FeS_2+\dfrac{11}{2}O_2\underrightarrow{t^o}Fe_2O_3+4SO_2\)

\(2SO_2+O_2⇌2SO_3\)

\(SO_3+H_2O\rightarrow H_2SO_4\)

\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)

\(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

\(Na_2SO_4+Ba\left(OH\right)_2\rightarrow2NaOH+BaSO_4\)

\(2NaOH+ZnO\rightarrow Na_2ZnO_2+H_2O\)

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