Redox Flashcards
1
Q
Oxidation
A
- addition of oxygen
- removal of hydrogen
- loss of electrons
- increase in O.N
2
Q
Reduction
A
- removal of oxygen
- addition of hydrogen
- gain of electrons
- decrease in O.N
3
Q
Common oxidising agents
A
- Acidified Potassium manganate (VII) - KMnO4
- Acidified Potassium dichromate (VI) K2Cr2O7
- Iron (III) chloride - FeCl3
- Chlorine - Cl2 (Halogens)
- Oxygen - O2
4
Q
Common reducing agents
A
- Potassium iodide - KI
- Hydrogen- H2
- Carbon monoxide - CO
- Metals - Zn, Mg, Na
- Carbon -C
- Iron (II) Sulfate - FeSO4
- Sulfur dioxide - SO2
- Halides (Cl-)
5
Q
Potassium manganate (VII) KMnO4
A
- strong O.A
- use to test for R.A (Fe 2+)
- MnO4- to Mn2+ (purple to colourless)
- O.N: +7 to +2
- R.A: Fe 2+ to Fe 3+
- O.N : +2 to +3
6
Q
Potassium dichromate (K2Cr2O7)
A
- strong O.A
- used to test for R.A
- Cr2O7 (2-) to Cr 3+ (orange to green)
- O.N: +6 to +3
- R.A : Fe 2+ to Fe 3+
7
Q
Chlorine (O.A)
A
- displacement reaction of halogens
- Cl2 + 2KBr —> 2KCl + Br2
8
Q
Iron (III) salts (O.A)
A
- e.g FeCl3
- during reaction, yellowish-brown soln of iron(III) salts will be reduced to green soln of iron (II) salts
9
Q
Potassium iodide (R.A)
A
- colourless to brown
- iodide ions oxidised to brown aqueous iodine when KI reduces another substance
- iodine is slightly soluble in water to form brown soln
- 2KI (aq) + Cl2 (aq) —> I2 (aq) + 2KCl (aq)
10
Q
Carbon monoxide (R.A)
A
- CO
- used to reduce iron oxides to iron in the blast furnace
11
Q
Hydrogen (R.A)
A
- reduces copper (II) oxide to copper
- can be used to reduce oxide of metals below hydrogen in reactivity series of metals
12
Q
Iron (II) salts (R.A)
A
-during reaction, green soln of iron (II) salts oxidised to yellow/brown soln of iron (III) salts
13
Q
Oxidising agents
A
- oxidise others
- is reduced itself (used to test for R.A)
14
Q
Reducing agents
A
- reduce others
- is oxidised itself (used to test for O.A)
