A-Level/ Advanced Higher Chemistry course notes. Concise notes summarising the topic of kinetics. Notes are easy to follow and contain a summary of the topic with highlighted key-points and supportive examples where appropriate.
KINETICS
RATE EQUATION ORDER OF REACTION RATE CONSTANT
Kinetics is about how fast a reaction goes Factors affecting the rate of reaction
include concentration
of reactants surface areas temperatures and catalysts
The rate of a chemical reaction normally depends on the concentrations
of the
reactants
Consider the reaction 3 Products
If changing the concentration
of reactant Ahas no effect on the rate of reaction
when the concentration of B is kept constant then the reaction is zero order in
respect to A
If the initial concentration
of A is doubled and the initial concentration of B is
kept constant the rate of reaction doubles this suggests the rate of reaction is
directly proportional to the concentration
of A so rate RA
If the rate increases
bya factor of 4 when the concentration of B is doubled A
remains constant the rate is directly proportional to the square of the concentration
of B So rate RB
k the rate constant overall order of
A B the concentration of the reactant in mol i reaction 3
I order
of the reaction
Combining these results gives rate KA B where k is a constant
ygqgigagygggfgg.gg.gggggggygg
p
which the concentration
of that reactant is raised in the rate equation
The OVERALL order of a reaction is the SUM of the powers to which
the concentrations
of reactants are raised to in the rate equation
The order of a reaction can only be determined from experimental data
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