AQA A-level CHEMISTRY 7405/1 Paper 1 Inorganic and Physical Chemistry Version: 1.0 FinalQUESTION PAPER & MARKING SCHEME/ [MERGED] Mark scheme June 2023

AQA A-level CHEMISTRY 7405/1 Paper 1 Inorganic and Physical Chemistry Version: 1.0 Final *JUN* IB/M/Jun23/E9 7405/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL Monday 12 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 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 1 Inorganic and Physical Chemistry 2 *02* IB/M/Jun23/7405/1 Do not write outside the Answer all questions in the spaces provided. box 0 1 This question is about complexes of the transition metal chromium. 0 1 . 1 State the meaning of the term transition metal complex. [1 mark] Cr(PF3)6 is a complex of chromium that contains molecules of PF3 0 1 . 2 The electron pair repulsion theory can be used to predict the shape of a PF3 molecule. Draw the shape of a PF3 molecule. Include any lone pairs of electrons that influence the shape. Name the shape. [2 marks] Shape Name of shape 0 1 . 3 Suggest why the oxidation state of chromium is zero in Cr(PF3)6 [1 mark] 3 *03* Turn over ► IB/M/Jun23/7405/1 Do not write outside the The compound [Cr(NH box 3)4Cl2]Cl contains ammonia molecules. 0 1 . 4 Deduce the oxidation state of chromium in [Cr(NH3)4Cl2]Cl [1 mark] 0 1 . 5 Name the type of bond between N and H in ammonia. [1 mark] 0 1 . 6 The compound [Cr(NH3)4Cl2]Cl contains a complex ion that shows isomerism. Draw the two isomers of the complex ion. State the type of isomerism shown. [3 marks] Isomer 1 Isomer 2 Type of isomerism 0 1 . 7 Complete the equation to show the formation of one complex that contains chromium in its +3 oxidation state. [1 mark] CrCl3 + 5H2O → 10 4 *04* IB/M/Jun23/7405/1 Do not write outside the box 0 2 Figure 1 shows a cell used to measure the standard electrode potential for the half-cell Mg2+(aq) + 2 e– → Mg(s) Figure 1 0 2 . 1 State the purpose of the salt bridge. Identify an ionic compound that could be used in the salt bridge. [2 marks] Purpose Identity 0 2 . 2 State how, if at all, the EMF of this cell will change if the surface area of the platinum electrode is increased. [1 mark] 5 *05* Turn over ► IB/M/Jun23/7405/1 Do not write outside the The standard electrode potential, Eo for the half-cell is s