Oxidation And Reduction Flashcards
What is oxidation
Oxidation is the addition of oxygen, removal of hydrogen, loss of electrons, increase in oxidation number
What is reduction
Reduction is the addition of hydrogen, removal of oxygen, gain of electrons, decrease in oxidation number
What is a disproportional reaction
It is a reaction in which the same substance is oxidized and reduced
What are the applications of electrochemistry
Battery, control of corrosion, elctrolysis and metallurgy
What is electrochemistry
It is the branch of chemistry that deals with the inter conversion of electrical and chemical energy
Metals are good oxidizing agents
True/ false
False
What are the types of electrochemical cells and what do they do
Voltaic/galvanic: produces electricity in a spontaneous reaction
Electrolytic cell: produces a chemical change in a non-spontaneous reaction
What is Gibbs free energy
It is the max useful work done by a system
What is the relationship between Gibbs free energy and spontaneity of a reaction
When G is -ve, reaction is spontaneous
When G is +ve, reaction is non spontaneous
When G = 0, reaction is at equilibrium
Relationship between Gibbs free energy and the electrode potential of a cell
When E is -ve, G is +ve
When E is +ve, G is -ve
What is a potentiometer
It is an instrument that measures the potential difference of a cell by generating a voltage equal to that of the cell
What is the anode
It’s the positive electrode of a cell, oxidation takes place there and electrons leave
What is the cathode
It is the negative electrode, reduction takes place, electrons enter the cell
What are concentration cells and what is usually the electrode potential
They are volcanic cells with the same species on the two half cells but with different concentrations
E⁰ = 0
What is electrolysis
Electrolysis is a process of driving a reaction in a non spontaneous direction by passing current through it
