Hoàn thành PTHH sau:
Mg+O\(_2\)\(\underrightarrow{t^o}\)
Fe+O\(_2\)\(\underrightarrow{t^o}\)
Zn+O\(_2\)\(\underrightarrow{t^o}\)
S+O\(_2\)\(\underrightarrow{t^o}\)
P+O\(_2\)\(\underrightarrow{t^o}\)
?+?\(\underrightarrow{t^o}\)H\(_3\)PO\(_4\)
?+?\(\underrightarrow{t^o}\)HNO\(_3\)
Mg+HCl\(\underrightarrow{t^o}\)
?+HCl\(\underrightarrow{t^o}\)ZnCl\(_2\)
?+H\(_2\)O\(\underrightarrow{t^o}\)NaOH
?+?\(\underrightarrow{t^o}\)Ba(OH)\(_2\)
Giúp tớ đi =)
\(2Mg+O_2\rightarrow\left(t^o\right)2MgO\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
\(2Zn+O_2\rightarrow\left(t^o\right)2ZnO\)
\(S+O_2\rightarrow\left(t^o\right)SO_2\)
\(4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\)
\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
\(N_2O_5+H_2O\rightarrow2HNO_3\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(Na_2O+H_2O\rightarrow2NaOH\)
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)
1.
a) Na + ... \(\underrightarrow{t^0}\) Na\(_2\)O
b) Zn + ... \(\rightarrow\) ZnCl\(_2\) + H\(_2\)
c) Cao + ... \(\rightarrow\) Ca(OH)\(_2\)
d) SO\(_3\) + ... \(\rightarrow\) H\(_2\)SO\(_4\)
2.
a) Ba + ... \(\underrightarrow{t^0}\) BaO
b) CuO + ... \(\underrightarrow{t^0}\) Cu + H20
c) K + ... \(\rightarrow\) KOH + H\(_2\)
d) CO\(_2\) + ... \(\rightarrow\) H\(_2\)CO\(_3\)
\(1)\\ a) 4Na + O_2 \xrightarrow{t^o} 2Na_2O\\ b) Zn + 2HCl \to ZnCl_2 + H_2\\ c) CaO + H_2O \to Ca(OH)_2\\ d) SO_3 + H_2O \to H_2SO_4\\ 2)\\ a) 2Ba + O_2 \xrightarrow{t^o} 2BaO\\ b) CuO + H_2 \xrightarrow{t^o} Cu + H_2O\\ c) K + H_2O \to KOH + \dfrac{1}{2}H_2\\ d) CO_2 + H_2O \to H_2CO_3\)
Viết PTHH hoàn thành sơ đò chuỗi phản ứng sau
Al(OH)\(_{ }\)\(_3\) \(\underrightarrow{\left(1\right)}\) Al\(_2\)O\(_3\)\(\underrightarrow{\left(2\right)}\) Al\(_2\)(SO\(_4\))\(_3\)\(\underrightarrow{\left(3\right)}\) BaSO\(_4\)
\(1\\ 2Al\left(OH\right)_3\rightarrow\left(t^o\right)Al_2O_3+3H_2O\\ 2\\ Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\\ Al_2\left(SO_4\right)_3+3BaCl_2\rightarrow3BaSO_4+2AlCl_3\)
hãy thực hiện chuyển đổi hóa học sau:
a) K→K\(_2\)O→KOH
b) P→P\(_2\)O\(_3\)→H\(_3\)
c) Fe→Fe\(_3\)O\(_4\)→Fe→FeCL\(_2\)
\(a,4K+O_2\rightarrow2K_2O\\ K_2O+H_2O\rightarrow2KOH\\ b,4P+3O_{2\left(thiếu\right)}\rightarrow2P_2O_3\\ P_2O_3+3H_2O\rightarrow2H_3PO_3\\ c,3Fe+2O_2\rightarrow\left(t^o\right)3Fe_3O_4\\ Fe_3O_4+8Al\rightarrow\left(t^o\right)9Fe+4Al_2O_3\\ Fe+2HCl\rightarrow FeCl_2+H_2\)
Câu 2. Lập các PTHH sau và cho biết phản ứng nào là phản ứng phân hủy? Phản ứng nào là phản ứng hóa hợp? Vì sao? a. KClO\(_3\) \(\underrightarrow{t}\) KCL + O2
b.CaCO\(_3\)\(\underrightarrow{t}\) CaO + CO\(_2\)
c.Fe + HCl \(\rightarrow\) FeCl\(_2\) + H\(_2\)
d.H\(_2\) + O\(_2\) \(\rightarrow\) H\(_2\)O
e.Fe(OH)\(_3\) \(\rightarrow\) Fe\(_2\)O\(_3\) + H\(_2\)O
f.Na\(_2\)O + H\(_2\)O \(\rightarrow\) NaOH
\(a) 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ b) CaCO_3 \xrightarrow{t^o} CaO + CO_2\\ c) Fe + 2HCl \to FeCl_2 + H_2\\ d) 2H_2 + O_2 \xrightarrow{t^o} 2H_2O\\ e) 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\\ f) Na_2O + H_2O \to 2NaOH\)
- Phản ứng phân hủy : a,b,e
- Phản ứng thế: c
- Phản ứng hóa hợp : d,f
Phản ứng hóa hợp : từ hai hay nhiều chất sinh ra một chất mới
H2 + 1/2O2 -to-> H2O
Na2O + H2O => 2NaOH
Phản ứng phân hủy : từ một chất sinh ra hai hay nhiều chất mới.
2KClO3 -to-> 2KCl + 3O2
CaCO3 -to-> CaO + CO2
2Fe(OH)3 -to-> Fe2O3 + 3H2O
Câu 1 ) A / Mg(NO3) \(\underrightarrow{\left(1\right)}\) Mg(OH)2 \(\underrightarrow{\left(2\right)}\) MgCl2\(\underrightarrow{\left(3\right)}\) KCl \(\underrightarrow{\left(4\right)}\) KNO3
B/ \(Na\underrightarrow{\left(1\right)}Na_2O\underrightarrow{\left(2\right)}NaOH\underrightarrow{\left(3\right)}Na_2SO_4\underrightarrow{\left(4\right)}NaCl\underrightarrow{\left(5\right)}NaNO_3\underrightarrow{\left(6\right)}NaCl\underrightarrow{\left(7\right)}NaOH\)
C/\(Mg\underrightarrow{\left(1\right)}MgO\underrightarrow{\left(2\right)}MgCl_2\underrightarrow{\left(3\right)}Mg\left(NO_3\right)_2\underrightarrow{\left(4\right)}Mg\left(OH\right)_2\underrightarrow{\left(5\right)}MgSO_4\underrightarrow{\left(6\right)}MgCO_3\)
D/\(CuSO_4\underrightarrow{\left(1\right)}Cu\left(OH\right)_2\underrightarrow{\left(2\right)}CuO\underrightarrow{\left(3\right)}CuCl_2\underrightarrow{\left(4\right)}Cu\left(OH\right)_2\underrightarrow{\left(5\right)}CuSO_4\)
E/\(CuCl_2\underrightarrow{\left(1\right)}Cu\left(OH\right)_2\underrightarrow{\left(2\right)}CuSO_4\underrightarrow{\left(3\right)}Cu\underrightarrow{\left(4\right)}CuO\)
F/ \(Cu\left(OH\right)_2\underrightarrow{\left(1\right)}CuO\underrightarrow{\left(2\right)}CuCl_2\underrightarrow{\left(3\right)}Cu\left(NO_3\right)_2\underrightarrow{\left(4\right)}NaNO_3\)
G/\(Fe_2O_3\underrightarrow{\left(1\right)}FeCl_3\underrightarrow{\left(2\right)}Fe\left(OH\right)_3\underrightarrow{\left(3\right)}Fe_2O_3\underrightarrow{\left(4\right)}Fe_2\left(SO_4\right)_3\)
H/ \(ZnCl_2\underrightarrow{\left(1\right)}Zn\left(OH\right)_2\underrightarrow{\left(2\right)}ZnCl_2\underrightarrow{\left(3\right)}NaCl\underrightarrow{\left(4\right)}NaNO_3\)
M/\(CuO\underrightarrow{\left(1\right)}CuCl_2\underrightarrow{\left(2\right)}Cu\left(OH\right)_2\underrightarrow{\left(3\right)}CuO\underrightarrow{\left(4\right)}CuSO_4\)
N/\(Fe\left(OH\right)_2\underrightarrow{\left(1\right)}FeO\underrightarrow{\left(2\right)}FeCl_2\underrightarrow{\left(3\right)}Fe\left(ỌH_2\right)\underrightarrow{\left(4\right)}FeSO_4\underrightarrow{\left(5\right)}FeCl_2\underrightarrow{\left(6\right)}Fe\left(NO_3\right)_2\)
Z/ \(Mg\left(OH\right)_2\underrightarrow{\left(1\right)}MgO\underrightarrow{\left(2\right)}MgSO_4\underrightarrow{\left(3\right)}MgCl_2\underrightarrow{\left(4\right)}Mg\left(OH\right)_2\underrightarrow{\left(5\right)}MgCl_2\underrightarrow{\left(6\right)}Mg\left(NO_3\right)_2\)
X/\(Al\left(OH\right)_3\underrightarrow{\left(1\right)}Al_2O_3\underrightarrow{\left(2\right)}AlCl_3\underrightarrow{\left(3\right)}Al\underrightarrow{\left(4\right)}Al_2\left(SO_4\right)_3\)
g) 1. Fe2O3 + 6HCl → 2FeCl3 + 3H2O
2. FeCl3 + 3NaOH → 3NaCl + Fe(OH)3↓
3. 2Fe(OH)3 \(\underrightarrow{to}\) Fe2O3 + 3H2O
4. Fe2O3 + 3H2SO4 → Fe2(SO4)3 + 3H2O
h) 1. ZnCl2 + 2NaOH → 2NaCl + Zn(OH)2↓
2. Zn(OH)2 + 2HCl → ZnCl2 + 2H2O
3. ZnCl2 + 2NaOH → 2NaCl + Zn(OH)2↓
4. NaCl + AgNO3 → NaNO3 + AgCl↓
m) 1. CuO + 2HCl → CuCl2 + H2O
2. CuCl2 + 2NaOH → 2NaCl + Cu(OH)2↓
3. Cu(OH)2 \(\underrightarrow{to}\) CuO + H2O
4. CuO + H2SO4 → CuSO4 + H2O
Viết các phương trình phản ứng sau:
\(Cu\underrightarrow{1}CuO\underrightarrow{2}CuCl_2\xrightarrow[4]{3}Cu\left(OH\right)_2\xrightarrow[6]{5}Cu\left(NO_3\right)_2\underrightarrow{7}Fe\left(NO_3\right)_2\xrightarrow[10]{9}Fe\left(OH\right)_2\)
\(\left(1\right)Cu+\dfrac{1}{2}O_2\xrightarrow[]{t^0}CuO\\ \left(2\right)CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(\left(3\right)CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\\ \left(4\right)Cu\left(OH\right)_2+2HNO_3\rightarrow Cu\left(NO_3\right)_2+2H_2O\\ \left(5\right)Cu\left(NO_3\right)_2+Fe\rightarrow Fe\left(NO_3\right)_2+Cu\\ \left(6\right)Fe\left(NO_3\right)_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaNO_3\)
Viết PTHH chuyển hóa sau:
a/ H\(_2\) \(\underrightarrow{\left(1\right)}\) H\(_2\)O \(\underrightarrow{\left(3\right)}\) O\(_2\) \(\underrightarrow{\left(1\right)}\) ZnO
b/ KMnO\(_4\) \(\underrightarrow{\left(3\right)}\) O\(_2\) \(\underrightarrow{\left(1\right)}\) CuO \(\underrightarrow{\left(3\right)}\) Cu
a) 2H2 + O2 ---t0 --> 2H2O
2H2O --- đp ---> 2H2 + O2
2Zn + O2 --- t0 ---> 2 ZnO
b) 2KMnO4 ---t0 --> K2MnO4 +MnO2 +O2
2Cu + O2 --- t0--> 2CuO
CuO + H2 -- t0--> Cu + H2O
Viết PTPƯ thực hiện dãy chuyển hóa sau. Phân loại mỗi PƯHH đó
a/ KMnO\(_4\) -> O\(_2\) -> Fe\(_3\)O\(_4\) -> Fe -> FeSO\(_4\)
b/ Ba -> BaO -> Ba(OH)\(_2\)
c/ S -> SO\(_2\) -> SO\(_3\) -> H2SO\(_4\)
TK :
https://sachgiaibaitap.com/sach_giai/giai-sach-bai-tap-hoa-lop-8-bai-38-luyen-tap-chuong-5/#gsc.tab=0
a) KMnO4 (to) → K2MnO4 + MnO2 + O2 (phản ứng phân huỷ)
Fe + O2 (to) → Fe3O4 (phản ứng hoá hợp)
Fe3O4 + H2 (to) → Fe + H2O (phản ứng thế)
Fe + H2SO4 → FeSO4 + H2 (phản ứng thế)
b) Ba + O2 (to) → BaO (phản ứng hoá hợp)
BaO + H2O → Ba(OH)2 (phản ứng hoá hợp)
c) S + O2 (to) → SO2 (phản ứng hoá hợp)
SO2 + O2 (to) → SO3 (phản ứng hoá hợp)
SO3 + H2O → H2SO4 (phản ứng hoá hợp)
(các phương trình trên chưa cân bằng)
