a) 1: Na + O₂ \(\rightarrow\) Na₂O

2: Na₂O + H₂O \(\rightarrow\) 2NaOH

3: NaOH + SO₃ \(\rightarrow\) Na₂SO₄ + H₂O

4: Na₂SO₄ + BaCl₂ \(\rightarrow\) NaCl + BaSO₄

b) 1: CaO + H₂O \(\rightarrow\) Ca(OH)₂

2: Ca(OH)₂ + H₂CO₃ \(\rightarrow\) CaCO₃ + 2H₂O

3: CaCO₃ \(\underrightarrow{t^o}\) CaO + CO₂

4: CaO + HCl \(\rightarrow\) CaCl₂ + H₂O

a) 1. 4Na + O₂ → 2Na₂O

2. Na₂O + H₂O → 2NaOH

3. 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

4. Na₂SO₄ + BaCl₂ → 2NaCl + BaSO₄↓

\(\left(1\right)2Fe+3Cl_2\xrightarrow[t^0]{}2FeCl_3\\ \left(2\right)FeCl_2+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\\ \left(3\right)2Fe\left(OH\right)_3\xrightarrow[t^0]{}Fe_2O_3+3H_2O\\ \left(4\right)Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)

____________

\(\left(1\right)2Al+3Cl_2\rightarrow2AlCl_3\\ \left(2\right)AlCl_3+3AgNO_3\rightarrow Al\left(NO_3\right)_3+3AgCl\\ \left(3\right)Al\left(NO_3\right)_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaNO_3\\ \left(4\right)2Al\left(OH\right)_3\xrightarrow[t^0]{}Al_2O_3+3H_2O\\ \left(5\right)Al_2O_3+3CO\xrightarrow[]{t^0}2Al+3CO_2\\ \left(6\right)4Al+3O_2\xrightarrow[]{t^0}2Al_2O_3\\ \left(7\right)2Al+3H_2SO_4\xrightarrow[]{}Al_2\left(SO_4\right)_3+3H_2\\ \left(8\right)Al_2\left(SO_4\right)_3+3BaCl_2\rightarrow2AlCl_3+3BaSO_4\)

a) (1) 2 KMnO4 -to-> K2MnO4 + MnO2 + O2

(2) S + O2 -to-> SO2

(3) 2 SO2 + O2 -450 độ C, xúc tác -> 2 SO3

(4) SO3 + H2O -> H2SO4

(5) 2 Al + 3 H2SO4 -> Al2(SO4)3 +3 H2

b) Các PTHH:

(1) 2 Ca + O2 -to-> 2 CaO

(2) CaO + H2O -> Ca(OH)2

(3) Ca(OH)2 + CO2 -> CaCO3+ H2O

(4) CaCO3 thì không ra H2 được

2KMnO4-to>K2MnO4+MnO2+O2

O2+S-to>SO2

2SO2+O2-to>2SO3

SO3+H2O->H2SO4

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

2>

Ca+O2-to>CaO

CaO+H2O->Ca(OH)2+H2

Ca(OH)2+CO2->CaCO3

CaCO3-->H2??

1) Al\(_2\)(SO\(_4\))\(_3\)+3BaCl\(_2\)→2AlCl\(_3\)+3BaSO\(_4\)↓

2)AlCl\(_3\)+3AgNO\(_3\)→Al(NO\(_3\))\(_3\)+3AgCl↓

3)Al(NO\(_3\))\(_3\)+3NaOH→Al(OH)\(_3\)+3NaNO\(_3\)

4)2Al(OH)\(_3\)\(\underrightarrow{to}\)Al₂O₃+3H₂O

5)2Al₂O₃\(\xrightarrow[criolit]{đpnc}\)4Al+3O₂

(1) Cu(OH)2 -^t0-> CuO + H2O

(2) CuO + H2 -^t0-> Cu + H2O

(3) Cu + Cl2 -^t0-> CuCl2

(4) CuCl2 + 2NaOH - > Cu(OH)2 + 2NaCl

(5) Cu(OH)2 + H2SO4 - > CuSO4 + 2H2O

(1) 2Na+2H2O--->2NaOH+H2

(2) 3NaOH+Al(NO3)3--->Al(OH)3+3NaNO3

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

(4) 2Al2O3-đpnc---> 4Al+3O2

(5) 2Al+3H2SO4--->Al2(SO4)3+3H2

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

(1) 2Na+2H2O->2NaOH+H2

(2) 3NaOH+AlCl3->Al(OH)3+3NaCl

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

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

(5) 2Al+3H2SO4->Al2(SO4)3+3H2

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

(1) 2Fe + 3Cl2 -^t0-> 2FeCl3

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

(3) 2Fe(OH)3 -^t0-> Fe2O3 + 3H2O

(4) Fe2O3 + 3H2SO4(l) - > Fe2(SO4)3 + 3H2O

(5) Fe2(SO4)3 + 3BaCl2 - > 2FeCl3 + 3BaSO4

1. 2Fe + 3Cl2 \(\rightarrow\)2 FeCl3

2. FeCl3 + 3NaOH \(\rightarrow\) Fe(OH)3 + 3NaCl

3. 2Fe(OH)3 \(\rightarrow\) Fe2O3 + 3H2O

4. Fe2O3 + 3H2SO4 \(\rightarrow\) Fe2(SO4)3 + 3H2O

5. Fe2(SO4)3 + 3BaCl2 \(\rightarrow\) 2FeCl3 + 3BaSO4

C2H5OH+3O2-to>2CO2+3H2O

b>

CO+O2-to>CO2

CO2+NaOH->NaHCO3

2NaHCO3-to>Na2CO3+H2O

Na2CO3+HCl->NaCl+H2O+CO2

NaCl+H2O-đp>NaOH+Cl2+H2

\(a) C_2H_5OH + 3O_2 \xrightarrow{t^o} 2CO_2 + 3H_2O\\ b)\\ (1)2CO + O_2 \xrightarrow{t^o} 2CO_2\\ (2)CO_2 + NaOH \to NaHCO_3\\ (3)2NaHCO_3 \xrightarrow{t^o} Na_2CO_3 + CO_2 + H_2O\\ (4) Na_2CO_3 + 2HCl \to 2NaCl +C O_2 + H_2O\\ (5) 2NaCl + 2H_2O \xrightarrow{điện\ phân\ dung\ dịch} 2NaOH + H_2+ Cl_2 \)

(1) 4FeS2 + 11O₂ → 2Fe₂O₃ + 8SO₂

(2) Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O

(3) FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl

(4) 2Fe(OH)₃ → Fe₂O₃ + 3H₂O.

(5) FeO + H₂SO₄ → FeSO₄ + H₂O.

(6) FeSO₄ + Mg → MgSO₄ + Fe.

(1) 4FeS2 + 11O₂ → 2Fe₂O₃ + 8SO₂

(2) Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O

(3) FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl

(4) 2Fe(OH)₃ → Fe₂O₃ + 3H₂O.

(5) FeO + H₂SO₄ → FeSO₄ + H₂O.

(6) FeSO₄ + Mg → MgSO₄ + Fe.