a, 2Al+3H₂SO₄\(\rightarrow\)Al₂SO₄+3H₂

c. 2Fe+3Cl₂\(\rightarrow\)2FeCl₃

b. 2NaOH+ZnCl₂\(\rightarrow\).Zn(OH)₂+2NaCl

d. 3Fe+2O₂\(\rightarrow\)Fe₃O₄

\(\cdot2Al+3H_2SO_4\xrightarrow[]{}Al_2\left(SO_4\right)_3+3H_2\)

\(\cdot2NaOH+ZnCl_2\xrightarrow[]{}Zn\left(OH\right)_2+2NaCl\)

\(\cdot2Fe+3CL_2\xrightarrow[]{}2FeCl_3\)

\(\cdot3Fe+2O_2\xrightarrow[]{}Fe_3O_4\)

Câu 1 : 

\(a.Fe+\dfrac{3}{2}Cl_2\underrightarrow{^{t^0}}FeCl_3\)

\(b.2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

\(c.2H_2S+3O_{2\left(dư\right)}\underrightarrow{^{t^0}}2H_2O+2SO_2\)

\(d.2FeS+10H_2SO_{4\left(đ\right)}\underrightarrow{^{t^0}}Fe_2\left(SO_4\right)_3+9SO_2+10H_2O\)

Câu 2 : 

Trích mẫu thử

Cho quỳ tím vào các mẫu thử

- mẫu thử nào làm quỳ tím hóa đỏ là H₂SO₄

- mẫu thử nào làm quỳ tím hóa xanh là Na₂S

Cho dung dịch Bari clorua vào mẫu thử còn :

- mẫu thử nào tạo kết tủa trắng là MgSO₄

\(BaCl_2 +MgSO_4 \to BaSO_4 + MgCl_2\)

- mẫu thử nào không hiện tượng gì là KCl

Câu 3 : 

\(n_{Fe}=a\left(mol\right),n_{Mg}=b\left(mol\right)\)

\(m_A=56a+24b=13.2\left(g\right)\left(1\right)\)

\(n_{SO_2}=\dfrac{9.52}{22.4}=0.425\left(mol\right)\)

\(n_{H_2SO_4\left(bđ\right)}=\dfrac{100\cdot98}{100\cdot98}=1\left(mol\right)\)

\(a.\)

\(2Fe+6H_2SO_{4\left(đ\right)}\underrightarrow{^{t^0}}Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)

\(\)\(Mg+2H_2SO_{4\left(đ\right)}\underrightarrow{^{t^0}}MgSO_4+SO_2+2H_2O\)

\(n_{SO_2}=1.5a+b=0.425\left(mol\right)\left(2\right)\)

\(\left(1\right),\left(2\right):a=0.15,b=0.2\)

\(\%m_{Fe}=\dfrac{0.15\cdot56}{13.2}\cdot100\%=63.64\%\)

\(\%m_{Mg}=36.36\%\)

\(b.\)

\(n_{H_2SO_4\left(dư\right)}=1-0.425\cdot2=0.15\left(mol\right)\)

\(m_{\text{B}}=m_A+m_{dd_{H_2SO_4}}-m_{SO_2}=13.2+100-0.425\cdot64=86\left(g\right)\)

\(C\%_{Fe_2\left(SO_4\right)_3}=\dfrac{0.075\cdot400}{86}\cdot100\%=34.88\%\)

\(C\%_{MgSO_4}=\dfrac{0.2\cdot120}{86}\cdot100\%=27.91\%\)

\(C\%_{H_2SO_4\left(dư\right)}=\dfrac{0.15\cdot98}{86}\cdot100\%=17.09\%\)

\(c.\)

\(n_{NaOH}=\dfrac{119\cdot20}{40\cdot100}=0.595\left(mol\right)\)

\(\dfrac{n_{NaOH}}{n_{SO_2}}=\dfrac{0.595}{0.425}=1.4\) \(\Rightarrow\text{Tạo ra 2 muối}\)

\(n_{Na_2SO_3}=x\left(mol\right),n_{NaHSO_3}=y\left(mol\right)\)

\(\left\{{}\begin{matrix}2x+y=0.595\\x+y=0.425\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=0.17\\y=0.255\end{matrix}\right.\)

\(m_{Na_2SO_3}=0.17\cdot126=21.42\left(g\right)\)

\(m_{NaHSO_3}=0.255\cdot104=26.52\left(g\right)\)

\(d.\)

\(n_{Ba\left(OH\right)_2}=0.2\cdot0.35=0.07\left(mol\right)\)

\(n_{BaCl_2}=0.2\left(mol\right)\)

\(OH^-+H^+\rightarrow H_2O\)

\(0.07......0.07\)

\(n_{Ba^{2+}}=n_{Ba\left(OH\right)_2}+n_{BaCl_2}=0.07+0.2=0.27\left(mol\right)\)

\(n_{SO_4^{2-}}=3n_{Fe_2\left(SO_4\right)_3}+n_{MgSO_4}+n_{H_2SO_4\left(\text{còn lại}\right)}=3\cdot0.075+0.2+0.15-0.14=0.435\left(mol\right)\)

\(Ba^{2+}+SO_4^{2-}\rightarrow BaSO_4\)

\(0.27.........0.27.........0.27\)

\(\Rightarrow SO_4^{2-}\text{dư}\)

\(m_{BaSO_4}=0.27\cdot233=62.91\left(g\right)\)

$a) MnO_2 + 4HCl \xrightarrow{t^o} MnCl_2 + Cl_2 + 2H_2O$
$Cl_2 + Cu \xrightarrow{t^o} CuCl_2$

$CuCl_2 + 2NaOH \to Cu(OH)_2 + 2NaCl$
$2NaCl + 2H_2O \xrightarrow{đpdd, cmn} 2NaOH + H_2 + Cl_2$
$2NaOH + Cl_2 \to NaCl + NaClO + H_2O$
$NaClO + HCl \to NaCl + HClO$

b)

$2KMnO_4 + 16HCl \to 2KCl + 2MnCl_2 + 5Cl_2 + 8H_2O$
$Cl_2 + H_2 \xrightarrow{ánh\ sáng} 2HCl$
$HCl + KOH \to KCl + H_2O$

$2KCl + 2H_2O \xrightarrow{đpdd, cmn} 2KOH + H_2 + Cl_2$
$3Cl_2 + 2Fe \xrightarrow{t^o} 2FeCl_3$

$FeCl_3 + 3AgNO_3 \to Fe(NO_3)_3 + 3AgCl$

a, 2Na + 2H₂O ---> 2NaOH + H₂ (pư thế)

b, SO₂ + H₂O ---> H₂SO₃ (pư hoá hợp)

c, P₂O₅ + 3H₂O ---> 2H₃PO₄ (pư hoá hợp)

d, Al + 3H₂SO₄ ---> Al₂(SO₄)₃ + 3H₂ (pư thế)

e, 2Fe(OH)₃ --t^o--> Fe₂O₃ + 3H₂O (pư phân huỷ)

ài 5 / hoàn thành pt hóa học và phân loại phản ứng từ các sơ đồ sau:
  A/ 2NA+2H₂O -----> 2NaOH+H2
  B/ SO₂+H2O ---> H₂SO₃
  C/ P2O5 + 3H₂O ----> 2H₃PO₄
  D/ 2Al +3 H₂SO₄ ----> Al₂(SO₄)₃ +3H2
  E/ 2Fe(OH)₃ ----> Fe₂O₃+ 3H₂O
   

a) $2Fe + 3Cl_2 \xrightarrow{t^o} 2FeCl_3$

b) $2Al + 6HCl \to 2AlCl_3 + 3H_2$
c) $Mg + H_2SO_4 \to MgSO_4 + H_2$

d) $2NaOH + CO_2 \to Na_2CO_3 + H_2O$

e) $Fe_2O_3 +6HCl \to 2FeCl_3 + 3H_2O$

f) $N_2 + 3H_2 \buildrel{{t^o,xt,p}}\over\rightleftharpoons 2NH_3$

f) $2H_2 + O_2 \xrightarrow{t^o} 2H_2O$

Hoàn thành các phương trình hóa học của các phản ứng sau:

a, Fe +2 HCl -----> FeCl2 + H2

b, H2 + ......CuO. -to----> Cu + ......H2O.....

c,3 O2 + 4Al ---to--> ......2Al2O3.....

d, CaO + H2O -----> ....Ca(OH)2........ 

a) $4P + 5O_2 \xrightarrow{t^o} 2P_2O_5$

b) $Mg + Cl_2 \xrightarrow{t^o} MgCl_2$

c) $2Na + 2H_2O \to 2NaOH + H_2$

d) $C + O_2 \xrightarrow{t^o} CO_2$

e) $C_xH_y + (x + \dfrac{y}{4})O_2 \xrightarrow{t^o} xCO_2 + \dfrac{y}{2}H_2O$

f) $2Al + Fe_2O_3 \xrightarrow{t^o} Al_2O_3 + 2Fe$
g) $2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$

i) $Fe_xO_y + yCO \xrightarrow{t^o} xFe + yCO_2$

k) $Fe_2O_3 + 6HCl \to 2FeCl_3 +3 H_2O$

l) $3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4$

\(A,2KClO_3\underrightarrow{t^0}2KCl+3O_2\\ B,2KMnO_4\underrightarrow{t^0}K_2MnO_4+MnO_2+O_2\\ C,Zn+2HCl\xrightarrow[]{}ZnCl_2+H_2\\ D,2Al+3H_2SO_4\xrightarrow[]{}Al_2\left(SO_4\right)_3+3H_2\\ E,H_2+CuO\underrightarrow{t^0}Cu+H_2O\\ G,CaO+H_2O\xrightarrow[]{}Ca\left(OH\right)_2\\ \)

a)   \(2KCLO_3\) ------> 2KCL + \(3O_2\)

b) \(2KMNO_4\)--------> \(K_2\)MNO\(_4\) + \(MnO_2\)+\(O_2\)

C) Zn + 2HCL -----> \(ZnCl_2\) + \(H_2\)

d) 2Al + \(3H_2\)\(SO_4\) ------> \(Al_2\)(\(SO_4\))\(_3\)+ 3\(H_2\)

e) \(H_2\)+ CuO  ------> Cu + \(H_2\)O

g) CaO + H\(_2\)O -------->Ca(OH)\(_2\)