AQA Specimen Paper 1 Q1 (with explained solutions) |

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AQA Specimen Paper 1 Q1

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Answer all questions. . 1 Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, PF3 [6 marks] 0 1 Barcode Typesetter code<br />
. 2 State the full electron configuration of a cobalt(II) ion. [1 mark] . 3 Suggest one reason why electron pair repulsion theory cannot be used to predict the shape of the [CoCl4]2 ion. [1 mark] [2 marks] 0 1 0 1 . 4 0 1 Predict the shape of, and the bond angle in, the complex rhodium ion [RhCl4]2 Shape Bond angle Turn over for the next question Barcode Typesetter code Turn over <br />

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MARK SCHEMEA-level ChemistrySpecimen paper 1 Marking guidance Mark AO Comments Insufficient correct chemistry to gain a mark. 2 of 15 This question is marked using levels of response. Refer to the Mark Scheme Instructions for Examiners for guidance on how to mark this question. Level 3 56 marks All stages are covered and the explanation of each stage is generally correct and virtually complete. Answer is communicated coherently and shows a logical progression from stage 1 to stage 2 then stage 3. All stages are covered but the explanation of each stage may be incomplete or may contain inaccuracies OR two stages are covered and the explanations are generally correct and virtually complete. Answer is mainly coherent and shows progression from stage 1 to stage 3. Two stages are covered but the explanation of each stage may be incomplete or may contain inaccuracies, OR only one stage is covered but the explanation is generally correct and virtually complete. Answer includes isolated statements but these are not presented in a logical order or show confused reasoning. 2 AO1a 2 AO2a 2 AO2b Indicative chemistry content Stage 1: Electrons round PP has 5 electrons in the outside shellWith 3 electrons from 3 fluorine, there are a total of 8 electrons in outside shell so 3 bond pairs, 1 non-bond pairStage 2: Electron pair repulsion theoryElectron pairs repel as far as possibleStage 3: ConclusionsTherefore, tetrahedral / trigonal pyramidal shapeWith angle of 109(.5) decreased to 107 Lone pair repels more than bonding pairs Question 01.1 Level 2 34 marks Level 1 12 marks Level 0 0 marks<br />
MARK SCHEMEA-level ChemistrySpecimen paper 1 1s22s22p63s23p63d7 Too many electrons in d sub-shell / orbitals Tetrahedral (shape) 109.5 1 1 AO1a Allow correct numbers that are not superscripted AO3 1b AO2a AO2a Allow 109 3 of 15 01.2 01.3 01.4<br />

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