REDOX

Question 1

when is a reaction more thermodynamically favourable

Answer 1

when the ΔGf0 (the total free energy change) is more negative

Question 2

what does exergonic mean

Answer 2

chemical reactions that proceed with the liberation of energy and are thermodynamically favourable

Question 3

what does endergonic mean

Answer 3

chemical reactions that require energy input before they can proceed

Question 4

what is another name for free energy

Answer 4

Gibbs free energy

Question 5

which way round are the pairs written in the ‘redox ladder’

Answer 5

oxidised/reduced

Question 6

what are the pairs at the top of the
‘redox ladder’ like

Answer 6

more negative = more electronegative = good electron donors (bad electron acceptors)

Question 7

what are the pairs at the bottom of the
‘redox ladder’ like

Answer 7

more positive = more electropiositive = less electronegative = good electron acceptors (bad electron donors)

Question 8

what does a bigger difference in ΔE° mean

Answer 8

more energy is produced in the reaction

Question 9

how are ΔGf0 and ΔE0 related

Answer 9

ΔG0’ = -nF(ΔEo’)
where
n = number of electrons transferred
F = Faraday’s constant (96.48 kJ/V)