This document contains 2022

AQA A LEVEL CHEMISTRY Paper 2 2022 BUNDLE

Organic and Physical Chemistry

Question Paper + Mark Scheme 2022

Answer all questions in the spaces provided. box

0 1 An acidified solution of butanone reacts with iodine as shown.

CH3CH2COCH3 + I2 → CH3CH2COCH2I + HI

0 1 . 1 Draw the displayed formula for CH3CH2COCH2I

Give the name of CH3CH2COCH2I

[2 marks]

Displayed formula

Name

3

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IB/M/Jun22/7405/2

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outside the

box 0 1 . 2 The rate equation for the reaction is

rate = k[CH3CH2COCH3][H+]

Table 1 shows the initial concentrations used in an experiment.

Table 1

CH3CH2COCH3 I2 H+

Initial concentration / mol dm−3 4.35 0.00500 0.825

The initial rate of reaction in this experiment is 1.45×10−4 mol dm−3 s−1

Calculate the value of the rate constant, k, for the reaction and give its units.

[3 marks]

k

Units

0 1 . 3 Calculate the initial rate of reaction when all of the initial concentrations are halved.

[1 mark]

Initial rate of reaction mol dm−3 s−1

Question 1 continues on the next page

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outside the

box 0 1 . 4 An experiment was done to measure the time, t, taken for a solution of iodine to react

completely when added to an excess of an acidified solution of butanone.

Suggest an observation used to judge when all the iodine had reacted.

[1 mark]

The experiment was repeated at different temperatures.

Figure 1 shows how 1

t varied with temperature for these experiments.