Particles hitting
into each other
with enough
force
The number of successful collisions is a
small percentage of the total number of
collisions taking place in a given time
Collision frequency
Number of successful collisions per second
High the frequency the higher the rate of reaction
Factors affecting rate of reaction
Temperature
Higher temp increases the
mean velocity of the particles
Higher collision frequency
because faster particles
more successful reactions
Higher collision frequency high reaction rate
Concentration of the reactants
Increasing concentration
increases amount of reactants
in the same volume
More particles higher
collision frequency
High collision frequency
high reaction rate
Surface area
Increasing surface area allows
more of the reactants to collide
with each other with enough
energy
Higher collision
frequency higher rate
of reaction
Catalyst
Increase rate of reaction but
remain chemically unchanged at
the end of the reaction
Many catalyst only work
on certain reaction
It works by creating a
surface on which the
reaction molecules can
collide with each other-this
reduces the energy needed
for a collision to be
successful
More particles will have the
minimum amount of energy
required, increasing the collision
frequency
Using catalyst lowers cost of industrial reaction and preserves the worlds resources