Chem = Electrolysis

IGCSE

Define electrolysis

this is breaking donw of ionic comounds in molten or aquoese form by using electricity

WhAT FORMS AT THE CATHODE?

metal and hydrogen deposit ( Reduction)

What forms at the anode?

Non- metals BUT hydrogen,

State what forms at the cathode and anode for molten compounds

Cathode= Metal.

Anode= non- metal.

State what forms at the cathode and anode for aquoese compounds

Cathode= the least reactive metal is discharged

Anode= if there is a halogen then it is discharged if there is no halogen OH- is released

Give three inert electrodes that can be used during electrolysis

1. platinum

2. carbon

3. graphite

Define elctroplating

this is the process of covering a metal that is in risk of rusting with a metal that has a lower reacting level on the surface of the other metal.

Uses of electroplating

1. improve appearance

2. resitant to corrosion

What are the conditions for electroplating?

The object has to be on the cathode.

Define a hydrogen oxygen fuel cell

uses hydrogen and oygen as a fuel by making them react and forming electricity and water

Advantages of hydrogen as a fuel for motor vehicles

1. Renewable if produced from solar or wind

2. lower rates of flammability than petrol

3. does not emmit CO2

4. not toxic

Disadvantages of hydrogen as fuel cells.

1. expensive

2. no stations to top up vehicles using the system

3. large fuel tank required

4. non renewable if generated from nuclear energ