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Module 5 Physical chemistry and transition elements
Rates
rate determining step
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Cards (7)
The slowest step in a reaction mechanism is called the
rate determining step
, or
RDS
We can use
reaction mechanisms
, alongside information about what step is the
slowest
to find the rate equation for a reaction.
The rate equation only contains
reactants
(and occasionally
catalysts
) which appear
before
or
during
the
rate determining step
The number of times each reactant appear before or during the rate determining step determines their
order
Making rate equation from reaction mechanism and slowest step
Look for
slowest
step
Cross out
intermediates
Write reactant molecules involved
before
and
during
slowest step
Add to rate equation and
simplify
Reactants involved before or during
RDS
are in the
rate equation
Order
of
reactants
=
no.
times involved before or during
RDS
If we know
reaction mechanism
or
rate equation
we can deduce the
RDS
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