chapt 7 Kinetics

Question 1

Define rate of reaction

Question 2

Define rate eqn

Question 3

Define order of reaction

Question 4

Define rate constant

Question 5

Define half-life of a reaction

Question 6

Define rate determining step

Question 7

Define activation energy

Question 8

Define catalysis

Question 9

Describe mode of action of a heteroge_neo_us catalyst

Answer 9

1. Diffusion
   - Rxt molecules diffuse to the surface of the catalyst.
   .
2. Chemisorption
   - rxt molecules are chemically a_d_sorbed onto the surface of neighbouring active sites.
   - Chemisorption involve the formation of temporary weak bonds btwn molecules and catalyst using vacant energically accessible orbitals
   .
   These weak bonds:
   - weaken covalent bonds within the rxts, lowering the Ea.
   - increase surface conc of rxts.
   - hold rxts in the correct orientation for rxn to occur, increasing rate of effective collisions.
   .
3. Reaction
   - Rxts dissociate to form highly rxtive intermediates, which combine to form (prdt).
   .
4. Desorption
   - Prdts break free from catalyst and diffuse away
   - Catalyst is regenerated.

Question 10

Describe mode of action of homogeneous catalyst