FACTORS AFFECTING RATE OF A CHEMICAL REACTION

Factors that influence the reaction rates of chemical reactions include :

1) Concentration of reactants

2) Pressure

3) Temperature

4) Catalyst

5) Nature of reactants

6) Orientation of reacting species

7) Surface area

8) Intensity of light

9) Nature of solvent

According to the collision theory, the rate of a reaction is directly proportional to the number of effective collisions per second between the reactant molecules. Rate of a reaction is directly proportional to the concentration of reactants.

i.e. rate (r) ∝ cn 

where

c = concentration

n = order of the reaction

or r = kc

where

k = specific rate

Explanation: The number of collisions and hence the activated collisions between the reactant molecules increase with increase in concentration. Therefore, according to the collision theory, the rate of a reaction should increase with increase in the concentration since the rate is directly proportional to the collision frequency.

 

MORE AT

http://www.adichemistry.com/physical/kinetics/factors/factors-affecting-rate-reaction.html

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