Deck 1 Flashcards
What is oxidation?
Loss of electrons, increase in oxidation state
What is reduction?
Gain of electrons, decrease in oxidation state
What does a reducing agent do?
Donates electrons while being oxidised itself
What does an oxidising agent do?
Accepts electrons while being reduced itself
Does an electrolytic cell gain energy from a redox reaction?
No, it uses electrical energy to drive a reaction
What is a half-cell?
An electrode immersed in a solution of its ions. 2 half-cells is an electrochemical cell
What way do electrons flow?
From the red. agent in the more - half-cell to the ox. agent in the more + half-cell
What does a greater difference between an ox. and red. agent mean?
Greater voltage of the cell
A + E and a negative delta G indicate that a reaction is..
Spontaneous
The equation for Faraday’s Laws:
m=MQ/nF
What are the 3 broad types of overpotential?
Activation op., concentration op. and ohmic op.
What are the 2 main types of op. that we are interested in?
Activation op. and concentration op. at working electrode
What is the purpose of a Luggin probe?
It holds the reference electrode with its tip very close but not touching the working electrode
How does migration arise?
Due to a gradient of electrical potential (for ions)
How does diffusion arise?
Due to a gradient of electrical potential
