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Đề thi học sinh giỏi Hóa
C+CO2->CO
CO+O2->CO2
CO2+NAOH->NaHCO3
NaHCO3+NaOH->Na2CO3+H2O
Na2CO3+BaCl2-->BaCO3+NaCl
NaCl+H2O-->NaOH+H2+Cl2
3Cl2+2Fe-->2FeCl3
2FeCl3+Zn-->ZnCl2+Fe
\(C+CO_2\rightarrow2CO\)
\(2CO+O_2\rightarrow2CO_2\)
\(CO_2+NaOH\rightarrow NaHCO_3\)
\(NaHCO_3+NaOH\rightarrow H_2O+Na_2CO_3\)
\(Na_2CO_3+BaCl_2\rightarrow2NaCl+BaCO_3\)
\(2NaCl\rightarrow2Na+Cl_2\)
\(3Cl_2+2Fe\rightarrow2FeCl_3\)
\(2FeCl_3+3Mg\rightarrow2Fe+3MgCl_2\)
a, PTHH :
\(2Fe+3Cl_2\rightarrow2FeCl_3\) (nhiệt độ>250oC)
\(2FeCl_3+3Ba\left(OH\right)_2\rightarrow3BaCl_2+2Fe\left(OH\right)_3\)
\(BaCl_2+Na_2SO_4\rightarrow BaSO_4+2NaCl\)
\(2NaCl\rightarrow2Na+Cl_2\) ( điện phân nóng chảy )
\(Cl_2+H_2O\rightarrow HCl+HClO\)
a)
3Cl2+2Fe--->2FeCl3
FeCl2+Ba(OH)2---->Fe(OH)2+BaCl2
BaCl2+Na2SO4-->BaSO4+2NaCl
2NaCl-----dpdd--> 2Na+Cl2
Cl2+H2O--->HCl+HClO
b)
CaCO3+CO2+H2O-->Ca(HCO3)2
Ca(HCO3)2-->CaCO3+H2O+CO2
CaCO3-->CaO+CO2
CaO+SiO2-->CaSiO2
Chúc bạn học tốt
a) Các PTHH:
(1) 2 Fe +3 Cl2 -to-> 2 FeCl3
(2) FeCl3 + 3 NaOH -> Fe(OH)3 +3 NaCl
(3) 2 Fe(OH)3 -to-> Fe2O3 + 3 H2O
(4) Fe2O3 + 3 CO -to-> 2 Fe + 3 CO2
(5) Fe + 2 HCl -> FeCl2 + H2
(6) FeCl2 + 2 AgNO3 -> Fe(NO3)2 + 2 AgCl
b) Các PTHH:
(1) MnO2 + 4 HCl(đặc) -to-> MnCl2 + Cl2 + 2 H2O
(2) 3 Cl2 + 2 Fe -to-> 2 FeCl3
(3) FeCl3 + 3 NaOH -> Fe(OH)3 + 3 NaCl
(4) NaCl + H2O -ddpdddcmnx-> NaOH + 1/2 H2 + 1/2 Cl2
(5) Cl2 + Cu -to-> CuCl2
(6) CuCl2 + 2 AgNO3 -> Cu(NO3)2 + 2 AgCl
c) Các PTHH:
(1) 4 Al + 3 O2 -to-> 2 Al2O3
(2) Al2O3 + 6 HCl -> 2 AlCl3 + 3 H2O
(3) AlCl3 + 3 KOH -> 3 KCl + Al(OH)3
(4) 2 Al(OH)3 -to-> Al2O3 +3 H2O
(5) 2 Al2O3 -đpnc-> 4 Al + 3 O2
\(\left(1\right)Cl_2+2NaOH\rightarrow NaCl+NaClO+H_2O\)
\(\left(2\right)NaClO+2HCl\rightarrow NaCl+H_2O+Cl_2\)
\(\left(3\right)NaClO+CO_2+H_2O\rightarrow NaHCO_3+HClO\)
\(\left(4\right)HClO\underrightarrow{\text{as}}HCl+\frac{1}{2}O_2\)
PTHH:
Cu + H2SO4 → H2 + CuSO4
CuSO4 + BaCl2 → BaSO4 + CuCl2
CuCl2 + Ba(OH)2 → BaCl2 + Cu(OH)2
Cu(OH)2 \(\underrightarrow{t^0}\) H2O + CuO
2CuO \(\underrightarrow{t^0}\) 2Cu + O2
Cu + H2SO4(ĐẶC NÓNG) -\(t^O\)> CuSO4 + 2H2O + SO2
CuSO4 + BACL2 -> CuCL2 + BASO4
CuCL2 + Pb(OH)2 -> Cu(OH)2 + PbCL2
Cu(OH)2 -\(t^O\)> CuO + H2O
CuO + H2 -\(t^O\)> Cu + H2O
a) HCl(đ) + MnO2 -t0-> Cl2 + MnCl2 + H2O
b) CuO + 2HCl - > CuCl2 + H2O
c) 2HCl + Na2Co3 -> CO2 + 2NaCl + H2O
d) HCl + AgNO3 - > AgCl + HNO3
e) 2KCl + 2H2O \(\xrightarrow[cmn]{đpdd}\) 2KOH + Cl2 + H2
f) Cl2 + H2O - > HCl + HClO
Cl2 + NaOH - > NaCl + NaClo
g Cl2 + Ca(OH)2 -t0->CaoCl2 + H2O
h) 2CaOCl2+ H2O + CO2 - > CaCO3 + CaCl2 +2HClO
NaClo + CO2 + H2O - > NaHCO3 + HClO
+ MnO2 + 4HCl ===> MnCl2 + Cl2 + 2H2O
+ 2Fe + 3Cl2 =(nhiệt)=> 2FeCl3
+ FeCl3 + 3NaOH ===> Fe(OH)3 + 3NaCl
+ 2NaCl + 2H2O =(đpdd, có màng ngăn)=> 2NaOH + Cl2 + H2
+ CuCl2 + 2AgNO3 ===> Cu(NO3)2 + 2AgCl
Mn02+4HCl----> Cl2+ 2H20+ MnCl2
2Fe+ 3Cl2----> 2FeCl3
FeCl3+3NaOH---> Fe(0H)3 + 3NaCl
2NaCl + 2H2O ---> Cl2 + H2 + 2NaOH
NaOH sao ra CuCl2 được
CuCl2+ 2AgNO3 ---> CuNO3 + 2AgCl
K nha !
Mg + H2SO4 -------> MgSO4 + H2
MgSO4 + BaCl2 --------> MgCl2 + BaSO4
MgCl2 + 2KNO3 -------> 2KCl + Mg(NO3)2
Mg(NO3)2 + 2NaOH ------> Mg(OH)2 + 2NaNO3
Mg(OH)2 --------> MgO + H2O
MgO + H2SO4 -------> MgSO4 + H2O
\(MgCl_2\rightarrow Mg+Cl_2\uparrow\)
\(2Mg+O_2\rightarrow2MgO\)
\(MgO+H_2SO_4\rightarrow MgSO_4\downarrow+H_2O\)
\(MgSO_4+Ba\left(NO_3\right)2\rightarrow Mg\left(NO_3\right)_2+BaSO_4\downarrow\)
\(Mg\left(NO_3\right)_2+2NaOH\rightarrow Mg\left(OH\right)_2\downarrow+2NaNO_3\)
\(Mg\left(OH\right)_2\rightarrow MgO+H_2O\)
1.1 C +CO2-----> 2CO
2CO+O2--->2 CO2
CO2+2KOH-> K2CO3+H2O
K2CO3+H2O+CO2----> 2KHCO3
1.2 3Cl2+2Fe ---> 2FeCl3
2FeCl3+3Ba(OH)2----> 3BaCl2+2Fe(OH)3
BaCl2+Na2SO4----> 2NaCl+BaSO4
2NaCl----> Cl2+2Na
Cl2+2NaOH----> NaClO+NaCl+H2O
C+O2->CO
CO+O2-->CO2
CO2+KOH-->K2CO3+H2O
K2CO3+CO2-->KHCO3
2)
Cl2+Fe-->FeCl3
FeCl3+Ba(OH)2-->BaCl2+Fe(OH)3
BaCl2+Na2CO3-->NaCl+BaCO3
NaCl+H2O-->NaOH+H2+Cl2
Cl2+NaOH-->NaCl+NaClO+H2O