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4 ý cuối :
1)
Cu + 2H2SO4→ CuSO4+ SO2+2H2O
Cu0 →Cu+2 +2e║ x1
S+6+2e →S+4 ║ x1
2)
2Al+ 4H2SO4→ Al2(SO4)3+ S+ 4H2O
2Al0→2Al+3 +6e║x1
S+6 +6e→S0 ║x1
3)
4Zn +5H2SO4→ 4ZnSO4+ H2S+ 4H2O
Zn0\(\rightarrow\) Zn+2 +2e ║x4
S+6 +8e →S−2 ║x1
4)
8Fe+ 15H2SO4→ 4Fe2(SO4)3+3H2S+ 12H2O
2Fe0→ 2Fe+3+6e║x4
S+6 +8e →S−2 ║x3
6 ý đầu
1.\(\overset{-3}{4NH_2}+\overset{0}{5O_2}\rightarrow\overset{+2+6}{4NO}+\overset{-2}{6H_2O}\)
4 X \(||\) N-3 + 5e → N+2
5 X \(||\) 2O0 + 4e → 2O-2
2.\(\overset{-3}{4NH3}+\overset{0}{3O_2}\rightarrow\overset{0}{2N_2}+\overset{-2}{6H_2O}\)
2 X \(||\) 2N-3 + 6e → 2N0
3 X \(||\) 2O0 + 4e → 2O-2
3.\(\overset{0}{3Mg}+\overset{+5}{8NO_3}\rightarrow\overset{+2}{3Mg\left(NO_3\right)_2}+\overset{+2}{2NO}+\overset{ }{4H_2O}\)
3 X \(||\) Mg0 → Mg+2 + 2e
2 X \(||\) N+5 + 3e → N+2
4.\(\overset{0}{Al}+\overset{+5}{6NO_3}\rightarrow\overset{+3}{Al\left(NO_3\right)_3}+\overset{+4}{3NO_2}+\overset{ }{3H_2O}\)
1 X \(||\) Al0 → Al+3 + 3e
3 X \(||\) N+5 + 1e → N+4
5.\(\overset{0}{Zn}+\overset{+5}{4HNO_3}\rightarrow\overset{+3}{Fe\left(NO_3\right)_3}+\overset{+2}{NO}+\overset{ }{2H_2O}\)
1 X \(||\) Zn0 → Mg+2 + 2e
2 X \(||\) N+5 + 3e → N+4
6.\(\overset{0}{Fe}+\overset{+5}{4HNO_3}\rightarrow\overset{+3}{Fe\left(NO_3\right)_3}+\overset{+2}{NO}+\overset{ }{2H_2O}\)
1 X \(||\) Fe0 → Fe+3 + 3e
1 X \(||\) N+5 + 3e → N+2
a)
| \(2Br^{-1} \rightarrow Br_2^0+2e\) | `xx1` |
| \(Cl_2^0+2e\rightarrow2Cl^{-1}\) | `xx1` |
`2NaBr + Cl_2 -> 2NaCl + Br_2`
b)
| \(2Fe^{+3}+6e\rightarrow2Fe^0\) | `xx1` |
| \(C^{+2}\rightarrow C^{+4}+2e\) | `xx3` |
\(Fe_2O_3+3CO\xrightarrow[]{t^o}2Fe+3CO_2\)
c)
| \(C^{+2}\rightarrow C^{+4}+2e\) | `xx5` |
| \(2I^{+5}+10e\rightarrow2I_2^0\) | `xx1` |
d)
| \(Cr^{+3}\rightarrow Cr^{+6}+3e\) | `xx2` |
| \(Br^0_2+2e\rightarrow2Br^{-1}\) | `xx3` |
\(2Cr\left(OH\right)_3+3Br_2+10OH^-\rightarrow2CrO_4^{2-}+6Br^-+8H_2O\)
e)
| \(Mn^{+7}+5e\rightarrow Mn^{+2}\) | `xx2` |
| \(C^{+2}\rightarrow C^{+4}+2e\) | `xx5` |
\(6H^++2MnO_4^-+5HCOOH\rightarrow2Mn^{2+}+8H_2O+5CO_2\uparrow\)
\(a.Mg+2H_2SO_{4\left(\text{đ}\right)}\underrightarrow{t^o}MgSO_4+2H_2O+SO_2\)
\(b.S+2H_2SO_{4\left(\text{đ}\right)}\underrightarrow{t^o}3SO_2+2H_2O\)
\(c.Fe_3O_4+4H_2SO_{4\left(\text{đ}\right)}\underrightarrow{t^o}Fe_2\left(SO_4\right)_3+4H_2O+SO_2\)
a) 4Mg + 5H2SO4đặc,nóng ➜ 4MgSO4 + H2S + 4H2O
4 Mg0 ---> Mg2+ + 2e
1 S+6 + 8e --->S-2
b) S + 2H2SO4đặc,nóng ➜ 3SO2 + 2H2O
1 S0---> S+4 + 4e
2 S+6+ 2e--->S+4
c) 2Fe3O4 + 10H2SO4đặc,nóng ➜ 3Fe2(SO4)3 + SO2 + 10H2O
1 2Fe38/3+--->3Fe23+ + 2e
1 S+6+ 2e--->S+4
Nhường e: ( Fe2+ ----> Fe3+ + 1e ) *14
Nhận e: S+6 +2e ----> S+4 (Tỉ lệ 1:2)
2S+6 + 12e ----> 2S0
=> 3S+6 +14e -----> S+4 + 2S0
Cân bằng: 14FeO + 48H+ + 3SO42- →14Fe3+ + SO2 + 2S + 24H2O