Sulfur In The Atmosphere II

Question 1

Outer Sphere redox reactions

Answer 1

ΔG for reaction is 0 but there’s still an activation energy for reaction as needs to overcome repulsion between complexes with same charge, stretch or shorten bonds to make them equal in length and rearrange solvent sphere surrounding complexes

Question 2

Why do we need activation energy to stretch and shorted bonds before outer sphere redox reactions

Answer 2

Electron transfer produces a vibration ally excited state, these would relax back to equilibrium positions giving a non-zero ΔG, this would violate first law of thermodynamics, because of this electron transfer is only allowed when bond length in donor and acceptor are the same so we need to equilibrate bond lengths which generates activation energy

Question 3

Good evidence for reaction proceeding via outer sphere mechanism

Answer 3

If k12 is within an order of magnitude with the measured experimental value

Question 4

Inner sphere redox reactions

Answer 4

Forms a bridged intermediate and electron transfer occurs via bridging ligand

Question 5

Good ligands for inner sphere redox reactions

Answer 5

Atoms with 2 or more suitable lone pairs or bidentate species with a delocalised region