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Collision Theory
 Collisions needed to
provide energy required
for a particle to change
(i.e. a bond to break) and
to bring the reactants
into contact
Reaction Rate
 Reaction needs sufficient
kinetic energy
 Minimum energy is
activation energy
In order to react, particles must…
 Collide with each other
 With sufficient energy
 In the correct
geometrical alignment
(steric factor)
Effect of concentration
 Increasing the
concentration will…..
 The same effect is seen
with pressure for gases
Effect of surface area
 Which will react faster,
powder or lumps ?
 What must be kept the
same if we are doing an
investigation into this ?
Effect of Temperature
 Why does increasing the
temperature increase the
rate ?
Maxwell- Boltzmann Distribution
Maxwell Boltzmann Distribution
 Activation energy
important
Effect of catalyst
Effect of light
 Excitation of reactants
 or breaking of bonds
 e.g. Silver halides
Orientation
 Geometry of reaction can
be important