Cambridge IGCSE Physical Science 0652 — 2013 Oct/Nov Paper 5 · Variant 1

This document consists of 7 printed pages and 1 blank page. IB13 11_0652_51/RP © UCLES 2013 [Turn over *4572480587* For Examiner's Use 1 2 Total UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICAL SCIENCE 0652/51 Paper 5 Practical Test October/November 2013 1 hour 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Chemistry practical notes for this paper are printed on page 8. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.

2 © UCLES 2013 0652/51/O/N/13 For Examiner's Use 1 You will investigate the formation of an image by a converging lens using the experimental set-up shown in Fig. 1.1. u v screen illuminated object converging lens Fig. 1.1 (a) (i) • Place the lens a distance u = 45.0 cm from the illuminated object (the triangular hole in the card). • Switch on the lamp so that an image of the illuminated object can be seen on the screen. • Adjust the position of the screen by moving it backwards and forwards along the bench, until a sharp image of the illuminated object is formed on the screen. • Measure, to the nearest 0.1 cm, the image distance v from the screen to the lens. • Record the distance v in Table 1.1. [1] Table 1.1 object distance u / cm image distance v / cm image distance / object distance = v / u 45.0 35.0 30.0 25.0 20.0 (ii) Repeat the procedure described in (i) for values of u = 35.0 cm, 30.0 cm, 25.0 cm, and 20.0 cm. [3] (iii) Complete the remaining boxes in the table by filling in the values of the ratio v / u, the ratio of image distance to object distance. [1]

3 © UCLES 2013 0652/51/O/N/13 [Turn over For Examiner's Use (b) State one precaution that you took whilst carrying out the experiment to ensure that the readings you obtained were reliable. precaution [1] (c) (i) On the grid provided, plot a graph of v / u (vertical axis) against v (horizontal axis). Draw the best fit straight line. [4] (ii) Calculate the gradient of your line. Show all working and indicate on your graph the values you chose to enable the gradient to be calculated. gradient = [2]

4 © UCLES 2013 0652/51/O/N/13 For Examiner's Use (iii) The focal length, f, of the lens is given by the formula f = gradient 1 Determine the focal length of the lens. f = cm [2] (d) This experiment is unsuitable for values of u close to the value of f. Use your observations from the experiment to explain this. [1]

5 © UCLES 2013 0652/51/O/N/13 [Turn over For Examiner's Use 2 You are going to carry out a series of tests to identify compound X. (a) Heat the hard glass test-tube containing X until there is no further visible change. Record your observation below and leave this test-tube to cool. You will be using the contents of this test-tube in (c)(i). observation [1] (b) (i) Place two spatula loads of X into a test-tube and add about 4 cm3 of dilute hydrochloric acid. Pass the gas produced through limewater in another test-tube. Keep the mixture of X and acid for (b)(ii). Record your observations, identify the gas produced, and the anion in X. observations name of gas name of anion [4] (ii) Transfer the contents of the test-tube from (b)(i) to the small beaker and add excess dilute sodium hydroxide. Record your observations and suggest the name of the metal cation in X. observations name of metal cation [2] (c) (i) The hard glass test-tube and its contents from (a) should now have cooled. Add about 8 cm3 dilute nitric acid, stir and wait for 2 minutes. Then filter the mixture into two test-tubes for use in (c)(ii) and (c)(iii). State the colour of the filtrate. [1]

6 © UCLES 2013 0652/51/O/N/13 For Examiner's Use (ii) To one of the test-tubes containing the filtrate, slowly add ammonia solution until there is no further change. Record your observations and suggest the formula of the cation in X. observations formula of cation [3] (iii) Carefully pour off some of the filtrate from the other test-tube from (c)(i), leaving behind about 1 cm depth of filtrate. Add a piece of magnesium ribbon which is about 1 cm in length. Record your observations. observations [2] (iv) Suggest what type of reaction has taken place in (c)(iii). [1] (d) Using your observations for (a), (b) and (c), identify compound X. compound X is [1]

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8 Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. © UCLES 2013 0652/51/O/N/13 CHEMISTRY PRACTICAL NOTES Test for anions anion test test result carbonate (CO3 2-) add dilute acid effervescence, carbon dioxide produced chloride (Cl -) [in solution] acidify with dilute nitric acid, then add aqueous silver nitrate white ppt. nitrate (NO3 -) [in solution] add aqueous sodium hydroxide then aluminium foil; warm carefully ammonia produced sulfate (SO4 2-) [in solution] acidify then add aqueous barium chloride or aqueous barium nitrate white ppt. Test for aqueous cations cation effect of aqueous sodium hydroxide effect of aqueous ammonia ammonium (NH4 +) ammonia produced on warming - copper(II) (Cu2+) light blue ppt., insoluble in excess light blue ppt., soluble in excess giving a dark blue solution iron(II) (Fe2+) green ppt., insoluble in excess green ppt., insoluble in excess iron(III) (Fe3+) red-brown ppt., insoluble in excess red-brown ppt., insoluble in excess zinc (Zn2+) white ppt., soluble in excess giving a colourless solution white ppt., soluble in excess giving a colourless solution Test for gases gas test and test results ammonia (NH3) turns damp red litmus paper blue carbon dioxide (CO2) turns limewater milky chlorine (Cl2) bleaches damp litmus paper hydrogen (H2) “pops” with a lighted splint oxygen (O2) relights a glowing splint

CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the October/November 2013 series 0652 PHYSICAL SCIENCE 0652/51 Paper 5 (Practical Test), maximum raw mark 30 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2013 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components.

Page 2 Mark Scheme Syllabus Paper IGCSE – October/November 2013 0652 51 © Cambridge International Examinations 2013 1 (a) (i) all recorded v values are to the nearest 0.1 cm ; [1] (ii) three r v values present ; four or five v values present ; v values increasing down the table for all recorded readings ; [3] (iii) v / u values correct to at least 2 significant figures ; [1] (b) move lens slowly to and fro until sharpest focus obtained ; object / lens / screen perpendicular to bench ; object and lens same height above the bench ; carry out experiment away from other bright light sources / in a darkened room ; [max 1] (c) (i) axes labelled with units ; suitable choice of scales (points should be in an area at least 6 cm × 6 cm) ; at least 4 points plotted correctly to half a small square ; good best fit straight line judgement ; [4] (ii) indication on graph of how data obtained AND use of at least half of line drawn ; correct calculation to at least 2 significant figures using data from the graph ; [2] (iii) correct calculation for f to at least 2 significant figures ; accuracy mark: if f is in the range given in the marking table which is based on v reading for u = 30 cm ; [2] (d) image will not fit on the screen / is too far away from the object / not formed / not sharp ; (allow any reasonable interpretation of results from graph) [1] [Total: 15]

Page 3 Mark Scheme Syllabus Paper IGCSE – October/November 2013 0652 51 © Cambridge International Examinations 2013 2 (a) (green to) black / brown – black (powder) ; [1] (b) (i) observations: green / green – blue (solution) ; limewater turns milky / chalky / white ppt (not cloudy) ; name of gas = carbon dioxide / CO2 ; (dependant on limewater or effervescence observation) name of anion = carbonate / CO3 2- ; [4] (ii) observations: blue ppt; name of metal cation: copper / Cu2+ (dependant on ‘blue’ observation) ; [2] (c) (i) blue ; [1] (ii) observations: blue ppt (not dark blue ppt) ; deep blue solution/dark blue solution ; formula of cation: Cu2+ (dependant on ‘blue’ observation) ; [3] (iii) colour of solution fades / bubbles / effervescence / gets hotter ; magnesium darkens / goes brown / goes black ; [2] (iv) displacement / redox (dependant on any observation in (iii)) OR exothermic (dependant on ‘gets hotter’ in (iii)) ; [1] (d) copper carbonate / copper(II) carbonate / CuCO3 ; [1] [Total: 15]