a)

CaCO₃ → CaO + CO₂ (t^o)

CaO + H₂O → Ca(OH)₂

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

b)

CaO + 2HCl → CaCl₂ + H₂O

c)

Ca(OH)₂ + 2AgNO₃ → Ca(NO₃)₂ + Ag₂O + H₂O

\(CaO+CO_2\underrightarrow{t^0}CaCO_3\)

\(CaCO_3+CO_2+H_2O\rightarrow Ca\left(HCO_3\right)_2\)

\(Ca\left(HCO_3\right)_2+2HCl\rightarrow CaCl_2+2CO_2+2H_2O\)

\(CaCl_2\underrightarrow{dpnc}Ca+Cl_2\)

\(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\)

\(Ca\left(OH\right)_2+Na_2CO_3\rightarrow CaCO_3+2NaOH\)

\(Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\)

a) 6Fe + 4O₂ ---> 2Fe₃O₄₄

b) 2Al + 3Cl₂ ---> 2AlCl₃

c) CuO + 2HCl ---> CuCl₂ + H₂O

d) BaCl₂ + Na₂SO₄ ---> BaSO₄ + 2NaCl

\(3Fe+2O_2\rightarrow Fe_3O_4\)

\(2Al+3Cl_2\rightarrow2AlCl_3\)

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

\(BaCl_2+Na_2SO_4\rightarrow BaSO_4+2NaCl\)

\(Ca\left(OH\right)_2+Na_2CO_3\rightarrow CaCO_3+2NaOH\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(2KClO_3\rightarrow2KCl+3O_2\)

\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)

\(4P+5O_2\rightarrow2P_2O_5\)

1. KClO3 --> O2 --> K2O --> KOH --> K2SO4 --> KCl --> Cl2

2KClO3---to---->2KCl+3O2

O2+4K-----> 2K2O

K2O+H2O---->2KOH

2KOH+H2SO4----->K2SO4+H2O

K2SO4+BaCl2-------> BaSO4 +2 KCl

2KCl---đpnc---> 2K +Cl2

2. Ca --> CaO --> Ca(OH)2 --> CaCO3 --> CaCl2 --> Ca(NO3)2 --> CaCO3

2Ca+O2---->2 CaO

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

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

CaCO3+2HCl-----> CaCl2+H2O+CO2

CaCl2+2AgNO3------> AgCl+Ca(NO3)2

Ca(NO3)2 +Na2CO3 -----> CaCO3 +2NaNO3

3. Ba --> Ba(OH)2 --> BaSO3 --> BaCl2 --> Ba(NO3)2 --> BaSO4

Ba+2H2O-----> Ba(OH)2+H2

Ba(OH)2+SO2------> BaSO3+H2O

BaSO3+2HCl-----> BaCl2+H2O+SO2

BaCl2+2AgNO3-----> Ba(NO3)2+2AgCl

Ba(NO3)2+H2SO4-------> BaSO4+2HNO3

\(2Ca+O_2\underrightarrow{t^o}2CaO\)

\(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)

\(Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\)

\(CaCl_2+Na_2SO_4\rightarrow CaSO_4\downarrow+2NaCl\)

phương trình đầu không phải H2 mà là H2O bạn nhé ^^

CaCO3+2HCl->CaCl2+CO2+H2O 

2C2H2+5O2->4CO2+2H2O

CaCO3 + 2HCl = CaCl2 + H2O + CO2

2C2H2+5O2→2H2O+4CO2

CaCO₃+2HCl----->CaCl₂+CO₂+H₂O

2C₂H₂+5O₂----->4CO₂+2H₂O

Chúc bạn học tốt

a,

Ca: kim loại

CaO: oxit bazo

Ca(OH)\(_2\) : bazo

CaCl\(_2\) : Muối

HCl: axit

Cl\(_2\) : khí clo

b, \(2Ca+O_2\rightarrow2CaO\)

\(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)

\(Ca\left(OH\right)_2+CuCl_2\rightarrow Cu\left(OH\right)_2+CaCl_2\)

\(CaCl_2+H_2\rightarrow Ca+2HCl\)

\(4HCl+MnO_2\rightarrow MnCl_2+Cl_2+2H_2O\)

a, Ca: kim loại

CaO: oxit bazơ

Ca(OH)₂ : dd Bazơ

CaCl₂ :Muối

HCl: Axit

Cl₂ : Phi kim

b, 2Ca +O₂ --^to--> 2CaO

CaO + H₂O ----> Ca(OH)₂

Ca(OH)₂ + MgCl₂ ----> CaCl₂ +Mg(OH)₂

CaCl₂ +H₂SO₄ -----> CaSO₄ + 2HCl

6HCl + 2Al -------> 2AlCl₃ +3H₂

xin lỗi, mình đính chính phương trình cuối :

2KnO4 +16 HCl ---^_to-> 2KCl + 5Cl₂ + 8H₂O

Bài 1:  

$CaCO_3 \xrightarrow{t^o} CaO + CO_2$
$CaO + H_2O \to Ca(OH)_2$
$Ca(OH)_2 + 2HCl \to CaCl_2 + 2H_2O$
$3CaCl_2 + 2K_3PO_4 \to Ca_3(PO_4)_2 + 6KCl$

Bài 2 : 

a) Không có chất nào thảo mãn

b) $2Fe(OH)_3 + 3H_2SO_4 \to Fe_2(SO_4)_3 + 6H_2O$

Bài 4 : 

a) $NaOH + SO_2 \to NaHSO_3$
$n_{SO_2} = n_{NaOH} = 0,25.0,5 = 0,125(mol)$

$V_{SO_2} = 0,125.22,4 = 2,8(lít)$

b) $n_{NaHSO_3} = n_{NaOH} = 0,125(mol)$
$m_{NaHSO_3} = 0,125.104 = 13(gam)$

Câu 5 : Dùng $Ca(OH)_2$

$Ca(OH)_2 + CO_2 \to CaCO_3 + H_2O$
$Ca(OH)_2 + SO_2 \to CaSO_3 + H_2O$

Câu 2 : 

$Mg + 2HCl \to MgCl_2 + H_2$
$FeO +2 HCl \to FeCl_2 + H_2O$
$Al(OH)_3 + 3HCl \to AlCl_3 + 3H_2O$

Câu 3 : 

a) $ZnO + 2HCl \to ZnCl_2 + H_2O$

b) $n_{ZnCl_2} = n_{ZnO} = \dfrac{16,2}{81} = 0,2(mol)$
$m_{ZnCl_2} = 0,2.136 = 27,2(gam)$