CaO + H₂O --> Ca(OH)₂

Ca(OH)₂ + CuCl₂ --> Cu(OH)₂\(\downarrow\) + CaCl₂

Cu(OH)₂ --t^o--> CuO + H₂O

CuO + H₂SO₄ --> CuSO₄ + H₂O

CuSO₄ + Fe --> FeSO₄ + Cu\(\downarrow\)

FeSO₄ + Zn --> ZnSO₄ + Fe\(\downarrow\)

\((1)Cu+2H_2SO_{4(\text{đ})}\xrightarrow{t^o} CuSO_4+2H_2O+SO_2\uparrow\\ (2)CuSO_4+BaCl_2\to CuCl_2+BaSO_4\downarrow\\ (3)CuCl_2+2NaOH\to Cu(OH)_2\downarrow +2NaCl\\ (4)Cu(OH)_2\xrightarrow{t^o}CuO+H_2O\\ (5)CuO+H_2\xrightarrow{t^o}Cu+H_2O\)

$Cu(OH)_2 \xrightarrow{t^o} CuO + H_2O$
$CuO + H_2SO_4 \to CuSO_4 + H_2O$
$CuSO_4 + BaCl_2 \to BaSO_4 + CuCl_2$
$CuCl_2 + 2AgNO_3 \to 2AgCl + Cu(NO_3)_2$
$Cu(NO_3)_2 + Fe \to Cu + Fe(NO_3)_2$
$2Cu + O_2 \xrightarrow{t^o} 2CuO$

\(\left(1\right)CuO+2HCl\rightarrow CuCl_2+H_2O\\ \left(2\right)CuCl_2+2KOH\rightarrow Cu\left(OH\right)_2\downarrow+2KCl\\ \left(3\right)Cu\left(OH\right)_2\rightarrow\left(t^o\right)CuO+H_2O\\ \left(4\right)CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)

\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ CuSO_4+Ba\left(NO_3\right)_2\rightarrow BaSO_4+Cu\left(NO_3\right)_2\\ Cu\left(NO_3\right)_2+2KOH\rightarrow Cu\left(OH\right)_2+2KNO_3\\ Cu\left(OH\right)_2\rightarrow\left(t^o\right)CuO+H_2O\\ CuO+2HCl\rightarrow CuCl_2+H_2O\\ CuCl_2\rightarrow\left(t^o\right)Cu+Cl_2\)

a)

(1) \(Cu+2H2SO4\left(đ\right)-^{t0}->CuSO4+SO2\uparrow+2H2O\)

\(\left(2\right)CuSO4+BaCl2->CuCl2+BaSO4\downarrow\)

(3) \(CuCl2+2AgNO3->Cu\left(NO3\right)2+2AgCl\downarrow\)

(4) \(Cu\left(NO3\right)2+2NaOH->Cu\left(OH\right)2\downarrow+2NaNO3\)

(5) \(Cu\left(OH\right)2-^{t0}->CuO+H2O\)

(6) \(CuO+2HCl->CuCl2+H2O\)

(7) \(CuCl2-^{t0}->Cu+Cl2\uparrow\)

(8) \(Cu+Cl2-^{t0}->CuCl2\)

(9) \(CuCl2+2NaOh->Cu\left(OH\right)2\downarrow+2NaCl\)

b)

\(4Na+O2-^{t0}->2Na2O\)

\(Na2O+H2O->2NaOH\)

\(2NaOH+CO2->Na2CO3+H2O\)

\(Na2CO3+H2SO4->Na2SO4+CO2\uparrow+H2O\)

\(Na2SO4+BaCl2->2NaCl+BaSO4\downarrow\)

\(2NaCl+2H2O-\xrightarrow[có-màng-ngăn]{đpdd}2NaOH+Cl2\uparrow+H2\uparrow\)

\(3NaOH+H3PO4->Na3PO4+3H2O\)

\(Cu+Cl_2\xrightarrow[]{t^0}CuCl_2\\ CuCl_2+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2AgCl\\ Cu\left(NO_3\right)_2+2KOH\rightarrow Cu\left(OH\right)_2+2KNO_3\\ Cu\left(OH\right)_2\xrightarrow[]{t^0}CuO+H_2O\\ CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ CuSO_4+Mg\rightarrow MgSO_4+Cu\)

Cu+Cl2➝CuCl2   

CuCl2+2AgNO3➝Cu(NO3)2+2AgCl↓ 

Cu(NO3)2+2NaOH➝ Cu(OH)2↓+2NaNO3

Cu(OH)2➝CuO+H2O

CuO+H2SO4➝CuSO4+H2O

CuSO4+Mg(OH)2➝Cu(OH)2↓+MgSO4

Yêu cầu viết tách hoặc chia nhỏ 

\(2Cu+O_2\underrightarrow{t^o}2CuO\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\)

\(Cu\left(OH\right)_2+H_2SO_4\rightarrow CuSO_4+2H_2O\)

\(Cu\overset{\left(1\right)}{-->}CuO\overset{\left(2\right)}{-->}CuSO_4\overset{\left(3\right)}{-->}CuCl_2\overset{\left(4\right)}{-->}Cu\left(NO_3\right)_2\overset{\left(5\right)}{-->}Cu\left(OH\right)_2\overset{\left(6\right)}{-->}CuO\overset{\left(7\right)}{-->}Cu\)

\(\left(1\right)2Cu+O_2\overset{t^o}{--->}2CuO\)

\(\left(2\right)CuO+H_2SO_4--->CuSO_4+H_2O\)

\(\left(3\right)CuSO_4+BaCl_2--->BaSO_4\downarrow+CuCl_2\)

\(\left(4\right)CuCl_2+2AgNO_3--->2AgCl\downarrow+Cu\left(NO_3\right)_2\)

\(\left(5\right)Cu\left(NO_3\right)_2+2NaOH--->Cu\left(OH\right)_2\downarrow+2NaNO_3\)

\(\left(6\right)Cu\left(OH\right)_2\overset{t^o}{--->}CuO+H_2O\)

\(\left(7\right)CuO+H_2\overset{t^o}{--->}Cu+H_2O\)

\(2Cu+O_2\underrightarrow{t^o}2Cuo\)

\(CuO+H_2SO_4->CuSO_4+H_2O\)

\(CuSO_4+BaCl_2->BaSO_4\downarrow+CuCl_2\)

\(CuCl_2+2AgNO_3->Cu\left(NO_3\right)_2+2AgCl\downarrow\)

\(Cu\left(NO_3\right)_2+2NaOH->Cu\left(OH\right)_2\downarrow+2NaNO_3\)

\(Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)

\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)