Developing Metals

Question 1

Why iron less likely to rust in alkaline conditions

Answer 1

High [OH-] pushes first equilibrium to left
Electrons formed push second equilibrium to left
So less Fe^2+ and so less rust is formed

Question 2

Equations for rusting

Answer 2

1/2O2 +H20 + 2e- 2OH-

Fe(s) Fe2+ + 2e-

Question 3

Why are compounds of transition metals likely to be coloured
(electron energy levels)

Answer 3

d orbitals are split
electrons excited to higher energy levels
absorb light
∆E=hv
complimentary colour is reflected/transmitted