Q6(b). Limitations of collision theory; the answer of transition-state theory
What are the limitations of collision theory? How is it explained by transition state theory?
Answer in brief
Collision theory, k = PZe−Ea/RT, treats molecules as hard spheres and cannot calculate P or Ea; transition-state theory, k = κ(kBT/h)eΔS‡/Re−ΔH‡/RT, brings in the activated complex through ΔS‡, which accounts for P.
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Coverscollision theorytransition state theoryEyring equationsteric factorentropy of activationactivated complex
All parts of Question 6
- 6(a) Bonding in cyclic phosphazene, benzene and borazine10 marks
- 6(b) Limitations of collision theory; the answer of transition-state theory20 marks
- 6(c) Langmuir adsorption isotherm; first-order and zero-order limits20 marks