Electrolysis Flashcards
1
Q
Electrolysis
A
ionic compound, in the aqueous / molten state is made to decompose by the passage of electricity
2
Q
Electrolyte
A
ionic compound which can conduct electricity in aqueous / molten state and is decomposed by it
3
Q
Applications of electrolysis
A
- purification / refining of metals
- electroplating
- extraction of metals
4
Q
Importance of electroplating
A
- improve physical properties of metals
- increase a metal’s resistance to corrosion
5
Q
Copper plating object
A
- cathode : object
- anode : pure copper
- electrolyte : CuSO4(aq)
6
Q
Silver plating an object
A
- cathode : object
- anode : pure silver
- electrolyte : Ag(NO3)2
7
Q
Uses of aluminium
A
- aluminium paint
- door & window frames
- electrical cables ; high electrical conductivity & low density
- make alloys used to make aircraft & racing bicycles ; low densitites
- make cooking utensils ; protective oxide layer ; prevents rusting ; good conductor of heat
8
Q
Anodising
A
oxide layer of aluminium increased to make it more resistant to corrosion
9
Q
Iron ore
A
Haematite
10
Q
Aluminium ore
A
Bauxite
11
Q
Main impurities present inhaematite
A
- silica
- silicon
- carbon
- sulfur
- phosphorous
12
Q
Waste gases from blast furnace
A
- N2
- CO
- CO2
- SO2
13
Q
Importance of recycling metals
A
- reduce environmental impact
- create jobs
- preserve metallic ores
