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A-level CHEMISTRY Paper 2 Organic and Physical Chemistry JUNE 2022

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A-level CHEMISTRY Paper 2 Organic and Physical Chemistry JUNE 2022 Time allowed: 2 hours Materials For this paper you must have: • the Periodic Table/Data Booklet, provided as an insert (en... closed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • All working must be shown. • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 105. Answer all questions in the spaces provided. box 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 . The rate equation for the reaction is rate = k[CH3CH2COCH3][H+] Table 1 shows the initial concentrations used in an experiment. Table 1 box 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 . 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 Turn over ► . 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. box 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 varied with temperature for these experiments. t Figure 1 [Show More]

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