A-level
CHEMISTRY
Paper 3
Downloaded by nipsey scott ()
lOMoARcPSD|
2
*02*
IB/M/Jun23/7405/3
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 Ethyl ethanoate can be made by reacting ethanol with ethanoic acid in the presence
of concentrated sulfur...
7405 3 QP Chemistry A 23Jun23 AM Chemistry (Loreto College)
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lOMoARcPSD|40099155 *JUN237405301 * IB/M/ Jun23 /E9 7405/3 For Examiner’s Use Question Mark 1 2 3 4 5 6 Section B TOTAL Friday 23 June 2023 Morning 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 provid ed. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use th e 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 90. Advice • You are advised to spend 70 minutes on Sectio n A and 50 minutes on Section B . 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 3 Downloaded by nipsey scott (nipseyscott76@gmail.com)
lOMoARcPSD|40099155 2 *02* IB/M/ Jun23 /7405/3 Do not write outside the box Section A Answer all questions in this section. 0 1 Ethyl ethanoate can be made by reacting ethanol wit h ethanoic acid in the presence of concentrated sulfuric acid . Method 1. A mixture of ethanol, ethanoic acid, and concentra ted sulfuric acid, with anti-bumping granules, is heated under reflux for 10 min utes. 2. The apparatus is rearranged for distillation. 3. The mixture is heated to collect the liquid that d istils between 70 and 85 °C 4. The distillate is placed in a separating funnel. Aqueous sodium carbonate is added, and a stopper is placed in the funnel. The mixture is shaken, releasing pressure as necessary. 5. The lower aqueous layer is removed and the upper organic layer is plac ed in a small conical flask. 6. Anhydrous calcium chloride is added to the sample in the conical flask. The flask is shaken well and left for a few minutes. 7. The liquid from the flask is redistilled and the d istillate is collected between 74 and 79 °C 0 1 . 1 State the role of concentrated sulfuric acid in thi s reaction. [1 mark] 0 1 . 2 The reaction mixture is flammable. Suggest how the reaction mixture should be heated i n step 1. [1 mark] Downloaded by nipsey scott (nipseyscott76@gmail.com)
lOMoARcPSD|40099155 3 *03* Turn over ► IB/M/ Jun23 /7405/3 Do not write outside the box 0 1 . 3 Figure 1 shows how a student set up the apparatus for reflux in step 1. You should assume that the apparatus is clamped cor rectly . Figure 1 Identify two mistakes the student made in setting up the appara tus. State the problem caused by each mistake. [4 marks] Mistake 1 Problem caused Mistake 2 Problem caused Downloaded by nipsey scott (nipseyscott76@gmail.com)
lOMoARcPSD|40099155
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