- Redox
- Reactions
- OILRIG
- Reduction
- Process involving gain of electrons
- Oxidation
- Process involving loss of electrons
- Oxidation Numbers
- Electrolysis
- Definition
- A process where electricity is used to make a chemical change happen that wouldnโt happen otherwise.
- Electrical energy from battery force non spontaneous reactions to react
- electrolytic cell
- battery
-
- pulls electrons, oxidising.
-
- will push electrons, reducing it.
- electrode
- definition:
- conductor which electricity leaves an object
- cathode
- anode
- electrolyte
- needs to be molten/aqueous
- electrochemistry
- electrochemical cells
- galvanic cells
- components
- half-cells
- oxidation half-cell
- reduction half-cell
- two electrodes
- voltmeter (connected to external circuit)
- electrolyte
- external circuit
- salt bridge
- purpose of salt bridge
- prevents direct contact between oxidising and reducing agents, allowing ions to pass between them.
- direction of ions salt bridge
- anions flow towards anode, cations flow towards cathode.
- electron flow
- polarity
- anode: negative
- cathode: positive
- daniel cell
- types of galvanic cells
- primary cell
- secondary cells (rechargeable)
- fuel cell
- oxidant/reductant continuously fed into cell.
-
electrolytic cells ยง
- applied electrochemistry
- electro refining of copper
- copper high resistance corrosion and good conductivity of electricity makes it great metal.
- only useful if pure (>99.95% Cu)
- blister copper extracted usually (around 98% Cu)