Summary A* NOTES Module 10- Reaction rates and equilibrium

RATES OF REACTION



Simple collision theory

(a) the effect of concentration, including the pressure of gases, on the rate of a reaction, in
terms of frequency of collisions
What is collision theory used to explain?
- How reacting molecules collide leading to a reaction
- Can only start a reaction if the conditions are right
What are the conditions needed for a reaction start
- Correct orientation
- Sufficient energy
What are the factors that affect the rate of a chemical reaction
- Temperature
- Pressure
- Concentration
- Surface area
- Catalyst
What is the effect of concentration on reaction rate
- Incr in conc
- Incr in no of particles per volume
- Increase in successful collisions
- Incr ror
What is the effect of pressure on reaction rate
- Increase pressure
- Decreased volume
- Increase in no of particles per volume
- Increase in successful collisions
- Increased ror

(b) calculation of reaction rate from the gradients of graphs measuring how a physical
quantity changes with time

Catalysts

(c) explanation of the role of a catalyst:
What is a catalyst?