A-LevelChemistryReaction kineticsMay/June 2021Paper 2 Q311 Marks
A large excess of 2-bromo-2-methylpropane is added to 0.0010mol of NaOH(aq), which contains a few drops of phenolphthalein indicator. A stopwatch is started as soon as the substances are mixed. The time taken for the pink colour to disappear is recorded. The experiment is repeated at different temperatures, keeping all concentrations and volumes of reagents constant. temperature /°C | time taken for pink colour to disappear/s 20 | 300 25 | 65 35 | 20 [Figure showing Maxwell-Boltzmann distribution curve with Ea marked] proportion of molecules with a given energy 0 Ea molecular energy
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