Rate expression questions

Assignment: Questions on Topic 16.1: Rate expression

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The rate constant for a particular reaction has the value 6.32 x 10−1 dm6 mol−2 s−1. Deduce the overall order of this reaction.

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Under acid conditions propanone can be brominated. The stoichiometric equation for this reaction is:



The following experimental data gives the initial rate of the reaction at particular concentrations.

i.  Deduce the order of the reaction with respect to propanone.

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ii.  Deduce the order of the reaction with respect to bromine.

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iii. Deduce the order of the reaction with respect to hydrogen ions.

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iv. Deduce the overall order of the reaction.

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v.  Write the rate expression for this reaction.

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vi. Calculate the value for the rate constant.

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vii. Calculate the initial rate of reaction for experiment number 5.

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For a zero order reaction the graph of concentration of reactant against time and the graph of rate of reaction plotted against concentration of reactant will both give a straight line.

i.  How will these two straight lines differ?

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ii.  Deduce the units of the rate constant for a zero order reaction.

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Describe how the graph of concentration of reactant against time for a second order reaction will differ to a graph of concentration of reactant against time for a first order reaction.

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Deduce the units of the rate constant, k for:

i.  a first order reaction.

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ii. a second order reaction.

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