Electrochemistry Flashcards
Difference between oxidation and reduction
OIL RIG
What undergoes reduction
The compound with a greater oxidizing ability/ stronger oxidizing agent
What undergoes oxidation
The compound with a greater reducing ability/ stronger reducing agent
What direction is the flow of electrical energy in galvanic cells
From (-) to (+)
3 properties of galvanic cells
- chemical to electrical energy
- exothermic
- spontaneous
What are the cathode and anode in galvanic cells
(-) anode
(+) cathode
What does the salt bridge do
- Completes the circuit
- Maintains electrical neutrality
- Separates electrolytes
3 properties of electrolytic cells
- electrical to chemical energy
- endothermic
- non spontaneous
What are the cathode and anode in electrolytic cells
(-) Cathode
(+) Anode
Where does electroplating occur
At the cathode
During electroplating, what does the electrolyte consist of
Contains ions of metal that is plating
What is impure copper called
Blister copper
Pros and cons of mercury cell
Pro: high purity NaOH
Con: Hg is toxic and high electricity usage
Pros and cons of diaphragm cell
Pros:
Cons: NaOH is less pure because NaCl and NaOH are difficult to separate
Asbestos is toxic
Pros and cons of membrane cell
Pros: concentration of NaOH can be cool trolled and it is environmentally friendly and cost effective
