Chem3 Flashcards
1
Q
Three industrial uses of electrolysis
A
- Electroplating 2. Metal purification (e.g., Cu) 3. Metal extraction (e.g., Al)
2
Q
Definition of electroplating
A
Forming a thin layer of shiny metal on another surface using electrolysis
3
Q
Four purposes of electroplating
A
- Make objects appear expensive 2. Add shine 3. Improve hygiene (e.g., chromium taps) 4. Prevent rusting
4
Q
Example of anti-rust electroplating
A
Car parts plated with chromium
5
Q
Why use chromium for taps?
A
Healthier (resists bacterial growth)
6
Q
Key metal extracted via electrolysis
A
Aluminum (from Al₂O₃ in Hall-Héroult process)
7
Q
Metal purified by electrolysis
A
Copper (impure Cu anode → pure Cu cathode)
8
Q
Energy requirement for industrial electrolysis
A
High electricity costs (major expense)
