Section 1 Flashcards
Do particles collide w/ each other in electrochemical way?
No
What do electrolytic cells require to induce electrochemical reactions?
external power
what are some advantages of doing rxns electrochemically?
-low temp
- low pressure
-selectivity is possible…higher yield
-separate products easily bc of the spacial separation)
-nearly instaneous control
what are some disadvantages of doing rxns electrochemically?
not every rxns are possible since reactants need to be dissolved
What does galvanic cells do?
converts spontaneous redox rxns to electrical energy
What are some chemicals produced by electrolysis?
-strong oxidizing agents (KMnO4, NaClO3, F2, H2O2, O3)
-metal oxides (MnO2, Cu2O)
-metal salts
What is electrowinning?
electrolytic process to produce high purity metals
What is the process of electrowinning
metal to be plated is dissolved in solution in oxidized form
What is metal refining
electrolytic process to refine impure metals produced during metallurgical processing (pyrometallurgical)
What is electroforming?
Used to manufacture parts which are too difficult to machine
How is galvanic cells used for corrosion?
Different sites within the same material can act as an annode and cathode…when in contact, electrical contact
What is leaching
using oxidizing agent to dissolve the metal ions out of an aqueous suspension of finely ground sulphide minerals
What is cementation
method for recovery of desired metal from solution by the addition of another metal in elemental form
what is electroless plating
metal plating without the use of electricity to drive the process by using reducing agents to create galvanic cell
what are the advantages of electroless plating
can coat insulating materials, irregular shapes, and deposits are harder and more dense
what are the disadvantages of electroless plating
solutions are expensive, slower, and require careful control of bath composition
where does oxidation and reduction occur?
“An Ox and Red Cat”…
anode oxidation and reduction cathode
what are oxidation and reduction?
“LEO the lion goes GER”
-Loss of Electron is Oxidation
-Gain of Electron is Reduction
when are reactions feasible (in relation to the change in gibbs free energy)
If ΔG < 0 … spontaneous
If ΔG = 0 … equilibrium
If ΔG > 0 … process cannot occur w/o energy input
