AQA Specimen Paper 1 Q7

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18 Table 4 shows some successive ionisation energy data for atoms of three different elements X, Y and Z. Elements X, Y and Z are Ca, Sc and V but not in that order. Table 4 First Second Third Fourth 648 590 632 1370 1150 1240 2870 4940 2390 4600 6480 7110 Fifth 6280 8120 8870 Sixth 12 400 10 496 10 720 For questions 7.1 and 7.2, only one answer per question is allowed. For each answer, completely fill in the circle alongside the appropriate answer. WRONG METHODS CORRECT METHOD If you want to change your answer you must cross out your original answer as shown. If you wish to return to an answer previously crossed out, ring the answer you now wish to select as shown. 0 7 . 1 Which element is calcium? 0 7 . 2 Which element is vanadium? [1 mark] [1 mark] Barcode Typesetter code<br /> 0 7 19 . 3 Justify your choice of vanadium in Question 7.2 [1 mark] An acidified solution of NH4VO3 reacts with zinc. Explain how observations from this reaction show that vanadium exists in at least two different oxidation states. [2 marks] . 4 0 7 Question 7 continues on the next page Barcode Typesetter code Turn over <br /> . 5 0 7 20 The vanadium in 50.0 cm3 of a 0.800 mol dm3 solution of NH4VO3 reacts with 506 cm3 of sulfur(IV) oxide gas measured at 20.0 C and 98.0 kPa. Use this information to calculate the oxidation state of the vanadium in the solution after the reduction reaction with sulfur(IV) oxide. Explain your working. The gas constant R = 8.31 J K1 mol1. [6 marks] Oxidation state = Barcode Typesetter code<br /> Barcode 21 Turn over for the next question DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED Typesetter code Turn over <br />

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