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Chemistry
Paper 2
Rates of reaction and energy changes
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Cards (7)
What is the activation energy?
The minimum energy required for a
chemical reaction
to occur
What is needed for a reaction to happen?
reactant
particles must
collide
with each other
the collisions must have enough
energy
What is the relation of concentration and pressure with rate of reaction?
rate of reaction increases if the concentration of a dissolved
reactant
increases or if the pressure of a reacting
gas
increases
When does the SA:VOL ratio inc?
when converting a
solid
into a powder as there is more
particles
to
collide
with, and the frequency of successful collisions increase
Why does the rate of reaction increase when pressure and concentration does too?
there are more
particles
in the same volume
the
freq
of more successful collisions increases
Why does temperature increase rate of reaction?
gains energy
particles move faster
freq of collisions
increases
the
energy of collision
increases
What are the 4 things that can affect rate?
concentration
pressure
SA:V
temperature
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