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Bài 3 :
4FeS + 7O2 --t--> 2Fe2O3 + 4SO2
Fe2O3 + 6HNO3 -> 2Fe(NO3)3 + 3H2O
Fe(NO3)3 + 3 NaOH -> Fe(OH)3 +3NaNO3
2Fe(OH)3 --t--> Fe2O3 + 3H2O
Fe2O3 + 3H2 -t-> 2Fe + 3H2O
Fe + S -t-> FeS
1, FeCl3 + 3KOH → Fe(OH)3 + 3KCl
2Fe(OH)3 \(\underrightarrow{t^o}\)Fe2O3 + 3H2O
Fe2O3 + 3H2 \(\underrightarrow{t^o}\) 2Fe + 3H2O
3Fe + 2O2 \(\underrightarrow{t^o}\) Fe3O4
2, 2Ca + O2 \(\underrightarrow{t^o}\) 2CaO
CaO + H2O → Ca(OH)2
Ca(OH)2 + CO2 → CaCO3 + H2O
CaCO3 + H2O + CO2→ Ca(HCO3)2
Ca(HCO3)2 + 2HCl → CaCl2 + 2H2O + 2CO2
CaCl2 + Ca(OH)2 → 2CaO + 2HCl
3, 4FeS + 7O2 \(\underrightarrow{t^o}\) 2Fe2O3 + 4SO2
Fe2O3 + 6HNO3 → 2Fe(NO3)3 + 3H2O
Fe(NO3)3 + 3KOH → Fe(OH)3 + 3KNO3
2Fe(OH)3 \(\underrightarrow{t^o}\) Fe2O3 + 3H2O
Fe2O3 + 3H2 \(\underrightarrow{t^o}\) 2Fe + 3H2O
Fe + S \(\underrightarrow{t^o}\) FeS
1) \(4FeS_2+11O_2\rightarrow8SO_2+2Fe_2O_3\)
2) \(2SO_2+O_2\rightarrow2SO_3\)
3) \(SO_3+H_2O\rightarrow H_2SO_4\)
4) \(H_2SO_4+K_2SO_3\rightarrow K_2SO_4+H_2O+SO_2\uparrow\)
5) \(SO_2+Na_2O\rightarrow Na_2SO_3\)
6) \(Na_2SO_3+BaS\rightarrow Na_2S+BaSO_3\downarrow\)
7) \(BaSO_3\rightarrow BaO+SO_2\uparrow\)
8) \(SO_2+Ba\left(OH\right)_2\rightarrow BaSO_3+H_2O\)
9) \(H_2SO_4+Na_2SO_3\rightarrow Na_2SO_4+SO_2+H_2O\)
10) \(Na_2SO_4+BaCl_2\rightarrow2NaCl+BaSO_4\)
1, (1) 4Al+ 3O2--(to)---> 2Al2O3
(2) Al2O3+6HCl---> 2AlCl3+ 3H2O
(3) AlCl3+3NaOH---->Al(OH)3+ 3NaCl
(4) 2Al(OH)3---(to)---> Al2O3+ 3H2O
(5)2Al2O3---(to+ đpnc)--> 4Al+ 3O2
(6) 2Al+ 3Cl2---> 2AlCl3
2, (1)Fe+ CuSO4-->Cu+ FeSO4
(2) FeSO4+ 2NaOH--> Fe(OH)2+ Na2SO4
(3) Fe(OH)2 +2HCl---> FeCl2+ 2H2O
Bài cuối tự làm nhé!
\(1,CH_4+Cl_2\underrightarrow{\text{ánh sáng}}CH_3Cl\\ 2,C_6H_6+Br_2\xrightarrow[t^o]{Fe}C_6H_5Br\\ 3,C_6H_6+Cl_2\underrightarrow{\text{ánh sáng}}C_6H_5Cl\\ 4,2CH_3COOH+CaCO_3\rightarrow\left(CH_3COO\right)_2Ca+CO_2\uparrow+H_2O\\ 5,\left(RCOO\right)_3C_3H_5+3NaOH\rightarrow3RCOONa+C_3H_5\left(OH\right)_3\\ 6,CaCO_3+CO_2+H_2O\rightarrow Ca\left(HCO_3\right)_2\\ 7,2NaHCO_3\underrightarrow{t^o}Na_2CO_3+CO_2\uparrow+H_2O\\ 8,NaOH+SiO_2\underrightarrow{t^o}Na_2SiO_3+H_2O\)
\(9,NaHCO_3+HCl\rightarrow NaCl+CO_2\uparrow+H_2O\\ 10,Cl_2+H_2O⇌HCl+HClO\\ 11,CH_3COOC_2H_5+NaOH\rightarrow CH_3COONa+C_2H_5OH\\ 12,C_6H_6+3H_2\xrightarrow[t^o]{Ni}C_6H_{12}\\ 13,\left(RCOO\right)_3C_3H_5+3H_2O\rightarrow3RCOOH+C_3H_5\left(OH\right)_3\\ 14,\left(-C_6H_{10}O_5-\right)_n+nH_2O\rightarrow nC_6H_{12}O_6\\ 15,CH_3COONa+NaOH\underrightarrow{t^o}CH_4\uparrow+Na_2CO_3\\16, Ca\left(HCO_3\right)\underrightarrow{t^o}CaCO_3+CO_2\uparrow+H_2O\)
\(17,MnO_2+4HCl\rightarrow MnCl_2+Cl_2\uparrow+2H_2O\\ 18,NaHCO_3+NaOH\rightarrow Na_2CO_3+H_2O\\ 19,2C_4H_{10}+5O_2\xrightarrow[men,xt]{t^o}4CH_3COOH+2H_2O\\ 20,2NaOH+Cl_2\rightarrow NaCl+NaClO+H_2O\\ 21,CH_3COOC_2H_5+H_2O\underrightarrow{t^o}CH_3COOH+C_2H_5OH\)
Tự cân bằng
\(Al+NaOH+H_2O-->NaAlO_2+H_2\)
\(NaAlO_2+CO_2+H_2O-->NaHCO_3+Al\left(OH\right)_3\)
\(Al\left(OH\right)_3--t^o->Al_2O_3+H_2O\)
\(Al_2O_3-dpnc\text{/}criolit->Al+O_2\)
\(Al+HCl-->AlCl_3+H_2\)
\(AlCl_3+Mg-->MgCl_2+Al\)
\(MgCl_2+Na_2CO_3-->MgCO_3+NaCl\)
\(MgCO_3--t^o->MgO+CO_2\)
1/ C2H4 + H2O => (140o,H2SO4đ) C2H5OH
C2H5OH + O2 => (men giấm) CH3COOH + H2O
CH3COOH + C2H5OH => (H2SO4đ,to) <pứ hai chiều> CH3COOC2H5 + H2O
CH3COOC2H5 + NaOH => (to) CH3COONa + C2H5OH
2/ C6H12O6 => (men rượu,to) 2CO2 + 2C2H5OH
C2H5OH + O2 => (men giấm) CH3COOH + H2O
2CH3COOH + CaCO3 => (CH3COO)2Ca + CO2 + H2O
3/ CaC2 + 2H2O => Ca(OH)2 + C2H2
C2H2 + H2 => (Pd, to) C2H4
C2H4 + 1/2 O2 => (xt,P,to) CH3CHO
CH3CHO + 1/2 O2 => CH3COOH
a) 4FeS2+11O2\(\overset{t^0}{\rightarrow}\)2Fe2O3+8SO2
2SO2+O2\(\overset{V_2O_5,t^0}{\rightarrow}2SO_3\)
SO3+H2O\(\rightarrow\)H2SO4
Cu+ 2H2SO4đ\(\overset{t^0}{\rightarrow}\)CuSO4+SO2+H2O
b)
AlCl3+3NaOH\(\rightarrow\)Al(OH)3+3NaCl
2Al(OH)3\(\overset{t^0}{\rightarrow}Al_2O_3+3H_2O\)
Al2O3+3H2SO4\(\rightarrow\)Al2(SO4)3+3H2O
Al2(SO4)3+3BaCl2\(\rightarrow\)3BaSO4+2AlCl3
a) SO2 + Na2O -> Na2SO3
Na2SO3 + H2SO4 -> Na2SO4 + SO2 + H2O
Na2SO4 + Ba(OH)2 -> BaSO4 \(\downarrow\)+ 2NaOH
2NaOH + CO2 -> Na2CO3 + H2O
b) CaO + CO2 -> CaCO3
CaCO3 \(\rightarrow^{t^o}\) CaO + CO2
CaO + H2O -> Ca ( OH)2
Ca ( OH)2 + CO2 -> CaCO3 + H2O
CaCO3 + H2SO4 -> CaSO4 + CO2 + H2O
c) 2Fe + 3Cl2 \(\rightarrow^{t^o}\) 2FeCl3
FeCl3 + 3NaOH -> Fe(OH)3 \(\downarrow\) + 3NaCl
2Fe(OH)3 \(\rightarrow^{t^o}\) Fe2O3 + 3H2O
Fe2O3 + 3H2SO4 -> Fe2(SO4)3 + 3H2O
Fe2(SO4)3 + 3BaCl2 -> 2FeCl3 + 3BaSO4\(\downarrow\)
d) Fe + 2HCl -> FeCl2 + H2
FeCl2 + 2AgNO3 -> 2AgCl\(\downarrow\) + Fe(NO3)2
Fe(NO3)2 + 2NaOH -> Fe(OH)2\(\downarrow\) + 2NaNO3
Fe(OH)2 + H2SO4 -> FeSO4 + 2H2O
1 Mai how long she had lived in Hanoi.
2 when our mother would arrive
3 to do those exercises ourselves
4 why I hadn't gone to the party the previous night
5 how often we had come back our village
Bạn ơi đăng đúng môn với ạ, đăng đúng môn thôi cũng khó lắm hay gì?
1. They asked Mai how long she had lived in Hanoi.
2. Tam asked us when our mother would arrive.
3. Mr Tom asked us to do those exercises ourselves.
4. He asked me why I didn't go to the party the night before.
5. They asked us how often we had come back our village.