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Students will be assessed on their ability to:
4.3 How fast? - rates
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demonstrate an understanding of the terms 'rate of reaction',
'rate equation', 'order of reaction', 'rate constant', 'half-life',
'rate-determining step', 'activation energy', 'heterogeneous and
homogenous catalyst'
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select and describe a suitable experimental technique to obtain
rate data for a given reaction, eg colorimetry, mass change and
volume of gas evolved
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investigate reactions which produce data that can be used to
calculate the rate of the reaction, its half-life from concentration
or volume against time graphs, eg a clock reaction
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present and interpret the results of kinetic measurements
in graphical form, including concentration-time and rate-concentration
graphs
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investigate the reaction of iodine with propanone in acid to
obtain data for the order with respect to the reactants and
the hydrogen ion and make predictions about molecules/ions
involved in the rate-determining step and possible mechanism
(details of the actual mechanism can be discussed at a later
stage in this topic)
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deduce from experimental data for reactions with zero, first and
second order kinetics:
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half-life (the relationship between half-life and
rate constant will be given if required)
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order of reaction
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rate equation
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rate-determining step related to reaction mechanisms
- activation energy (by graphical methods only;
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investigate the activation energy of a reaction, eg oxidation of
iodide ions by iodate(V)
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apply a knowledge of the rate equations for the
hydrolysis of halogenoalkanes
to deduce the mechanisms for primary and tertiary halogenoalkane hydrolysis and to deduce the mechanism
for the reaction between propanone and iodine
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demonstrate that the mechanisms proposed for the hydrolysis
of halogenoalkanes are consistent with the experimentally
determined orders of reactions, and that a proposed mechanism
for the reaction between propanone and iodine is consistent with
the data from the experiment in 4.3e
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use kinetic data as evidence for SN1 or SN2 mechanisms in the
nucleophilic substitution reactions of halogenoalkanes.
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THIOSULPHATE/ACID REACTION
IODINE CLOCK REACTION
IODINATION OF PROPANONE
REACTIVITY OF HALOGENOALKANES
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