a.

2Al2O3 \(\underrightarrow{t^o}\)4Al + 3O2\(\uparrow\)

Al + 6HNO3 \(\rightarrow\) Al(NO3)3\(\downarrow\) + 3NO2 + 3H2O

Al(NO3)3 + NaOH \(\rightarrow\) Al(OH)3\(\downarrow\) + NaNO3

2Al(OH)3 \(\xrightarrow[criolit]{đpnc}\) Al2O3 + 3H2O

Al2O3 + 3H2SO4 \(\rightarrow\) Al2(SO4)3 + 3H2O

Al2(SO4)3 + 3BaCl2 \(\rightarrow\) 3BaSO4\(\downarrow\) + 2AlCl3

2AlCl3 \(\xrightarrow[criolit]{đpnc}\) 2Al + 3Cl2\(\uparrow\)

2Al + 3CuSO4 \(\rightarrow\) 3Cu + Al2(SO4)3

C.

a/

b/

a)c+o2->co2

co2+ca(oh)2->caco3 +h2o

caco3+ba(oh)2->CA(OH)2+baco3

co2+ca(oh)2->caco3 +h2o

caco3+bacl2->cacl2+baco3

tui để em tui làm thử coi sao nó mới vào lớp 8

.sai cứ nói nhé

a) 2Fe+3Cl2--->2FeCl3

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

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

Fe2O3+H2---->2Fe+3H2O

Fe+H2SO4---->FeSO4+H2

FeSO4+BaCl2---->FeCl2+BaSO4

b) Fe+2HCl--->FeCl2+H2

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

Fe(NO3)2+2NaOH--->2NaNO3+Fe(OH)2

Fe(OH)2+Na2SO4--->2NaOH+FeSO4

FeSO4+Zn----->ZnSO4+Fe

Fe+.....Ko biết

c)4 Al+3O2--->2Al2O3

Al2O3+3H2SO4--->Al2(SO4)3+3H2O

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

Alcl3+3NaOH--->Al(OH)3+3NaCl

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

2Al2O3--->4Al+3O2

a) 2Fe+3Cl2--->2FeCl3

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

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

Fe2O3+H2---->2Fe+3H2O

Fe+H2SO4---->FeSO4+H2

FeSO4+BaCl2---->FeCl2+BaSO4

b) Fe+2HCl--->FeCl2+H2

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

Fe(NO3)2+2NaOH--->2NaNO3+Fe(OH)2

Fe(OH)2+Na2SO4--->2NaOH+FeSO4

FeSO4+Zn----->ZnSO4+Fe

ko có PTHH

c)4 Al+3O2--->2Al2O3

Al2O3+3H2SO4--->Al2(SO4)3+3H2O

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

Alcl3+3NaOH--->Al(OH)3+3NaCl

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

2Al2O3--->4Al+3O2

\(a,2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3\\ FeCl_3+3NaOH\to Fe(OH)_3\downarrow+3NaCl\\ 2Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\xrightarrow{t^o}2Fe+3CO_2\\ Fe+H_2SO_4\to FeSO_4+H_2\\ FeSO_4+BaS\to BaSO_4\downarrow+FeS\\ FeS+2HCl\to FeCl_2+H_2\\ FeCl_2+2AgNO_3\to Fe(NO_3)_2+2AgCl\downarrow\)

\(b,2Al_2O_3\xrightarrow[criolit]{đpnc}4Al+3O_2\\ 2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ Al_2(SO_4)_3+6NaOH\to 2Al(OH)_3\downarrow+3Na_2SO_4\\ Al(OH)_3+3HNO_3\to Al(NO_3)_3+3H_2O\\ 2Al(NO_3)_3+3Mg\to 3Mg(NO_3)_2+2Al\\ Al+NaOH+H_2O\to NaAlO_2+\dfrac{3}{2}H_2\)

\(a,4Al+3O_2\xrightarrow[t^0]{}2Al_2O_3\\ Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\\ AlCl_3+3AgNO_3\rightarrow Al\left(NO_3\right)_3+3AgCl\\ AlCl_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaCl\\ 2Al\left(OH\right)_3\xrightarrow[t^0]{}Al_2O_3+3H_2O\\ 2Al_2O_3\xrightarrow[đpnc]{criolit}4Al+3O_2\\ b,3Fe+2O_2\xrightarrow[t^0]{}Fe_3O_4\\ Fe_3O_4+8HCl\rightarrow2FeCl_3+FeCl_2+4H_2O\\ FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\\ 2Fe\left(OH\right)_3\xrightarrow[t^0]{}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\xrightarrow[t^0]{}2Fe+3CO_2\)

\(c,2Fe\left(OH\right)_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\\ Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\\ FeCl_3+AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\)