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AQA A-level CHEMISTRY 7405/2 Paper 2 Organic and Physical Chemistry Version: 1.0 FinalQUESTION PAPER & MARKING SCHEME/ [MERGED] Mark scheme June 20237,85 €
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AQA
A-level
CHEMISTRY
7405/2
Paper 2 Organic and Physical Chemistry
Version: 1.0 Final
*Jun*
IB/M/Jun23/E8 7405/2
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
TOTAL
Monday 19 June 2023 Afternoon Time allowed: 2 hours
Materials
For this paper you must have:
• the Per...
AQA A-level CHEMISTRY 7405/2 Paper 2 Organic and Physical Chemistry Version: 1.0 Final *Jun237405201* IB/M/Jun23/E8 7405/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Monday 19 June 2023 Afternoon Time allowed: 2 hours Materials For this paper you must have: • the Periodic Table/Data Booklet, provided as an insert (enclosed) • 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. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level CHEMISTRY Paper 2 Organic and Physical Chemistry 2 *02* IB/M/Jun23/7405/2 Do not write outside the box Answer all questions in the spaces provided. 0 1 This question is about rates of reaction. Figure 1 shows apparatus used to measure the rate of reaction when an acid reacts with an excess of solid sodium hydrogencarbonate, NaHCO 3 When different monoprotic organic acids are used, the rates at which gas escapes can be used to compare the strengths of the acids. A timer is started when the NaHCO 3 is added to the acid and the mass of CO 2 gas lost is recorded at regular intervals. (It is assumed that any change in mass is due to the loss of CO 2) Figure 1 0 1 . 1 Suggest a reason why using a conical flask instead of a beaker would give more accurate results in this experiment. [1 mark] 3 *03* Turn over ► IB/M/Jun23/7405/2 Do not write outside the box Figure 2 shows the results of this experiment when 25.0 cm3 of a 2.23 mol dm–3 solution of ethanoic acid reacts with an excess of NaHCO 3 Figure 2 0 1 . 2 Use Figure 2 to calculate the rate of reaction at 2 minutes. Deduce the units of your calculated rate. [3 marks] Rate Units 0 1 . 3 Chloroethanoic acid is a stronger acid than ethanoic acid. Sketch, on Figure 2, the curve you would expect when 25.0 cm3 of a 2.23 mol dm–3 solution of chloroethanoic acid reacts with an excess of NaHCO 3 Suggest why chloroethanoic acid is a stronger acid than ethanoic acid. [3 marks] 7
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