Cambridge IGCSE Science - Combined 0653 — 2013 May/June Paper 5 · Variant 2

This document consists of 10 printed pages and 2 blank pages. IB13 06_0653_52/RP © UCLES 2013 [Turn over *4061187265* For Examiner's Use 1 2 3 Total UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education COMBINED SCIENCE 0653/52 Paper 5 Practical Test May/June 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 12. 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. www.XtremePapers.com

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3 © UCLES 2013 0653/52/M/J/13 [Turn over For Examiner's Use 1 You are provided with two plants, A and B, each of which has been enclosed in a transparent polythene bag for a period of two days. In the bag around plant A there is a chemical that absorbs carbon dioxide. Both plants have had parts of some of their leaves covered with black paper. plant A plant B soil black paper chemical to absorb carbon dioxide transparent polythene bag Fig. 1.1 (a) Remove one leaf from each plant, choosing leaves that have been partly covered with black paper. Take care to remember which leaf came from which plant. In the space below, make clear labelled drawings of the two leaves to show which parts are covered with the black paper. leaf from plant A leaf from plant B [4]

4 © UCLES 2013 0653/52/M/J/13 For Examiner's Use (b) Now test both leaves for starch. You can carry out the test on both leaves at the same time, but it is important to remember which leaf is which. • Half fill a beaker with water, and bring it to the boil (you may have a water bath instead). • Remove the black paper from the leaf. • Place the leaf in the hot water, and let it stay there for 1 to 2 minutes. • Turn off any Bunsen burner or other naked flame. This is important for safety. • Use tweezers to remove the leaf from the hot water, and place the leaf in a clean test-tube. • Add alcohol to the test-tube, so it covers the leaf, and place this test-tube into the beaker or water bath that contains the hot water. • Leave the tube in the hot water for five minutes (during this time the alcohol may boil). • After five minutes, remove the tube from the hot water, and carefully pour away the alcohol into the waste container provided. • Pick up the leaf with tweezers, and dip it briefly back into the hot water. • Spread the leaf out on a white tile, and cover it with iodine solution. • Wait about one minute. Then, in the space below, make two clear pencil drawings of the two leaves. Label them to show the colours of the different parts. leaf from plant A leaf from plant B [3]

5 © UCLES 2013 0653/52/M/J/13 [Turn over For Examiner's Use (c) Look at your drawings for parts (a) and (b). Summarise your results in Table 1.1. Table 1.1 colour obtained with iodine starch is present (yes or no) area covered by black paper leaf from plant A area not covered by black paper area covered by black paper leaf from plant B area not covered by black paper [2] (d) Compare the results that you have recorded in Table 1.1 for the uncovered parts of the leaves from plant A and plant B. Use these results to write a conclusion about a condition necessary for photosynthesis. [1]

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7 © UCLES 2013 0653/52/M/J/13 [Turn over For Examiner's Use 2 In this experiment, you will be investigating the period of a simple pendulum. The period is the time for one complete to-and-fro swing (oscillation) of the pendulum. pendulum bob point of support 1 complete oscillation is the time taken for the bob to swing from A to B and back to A again. A B Fig. 2.1 The pendulum has been set up for you with its point of support at exactly 55.0 cm above the bench. Do not adjust this height, or the position of the clamp. exactly 55.0 cm h Fig. 2.2

8 © UCLES 2013 0653/52/M/J/13 For Examiner's Use (a) Without altering the height of the clamp above the bench, adjust the length of the thread until the height, h, of the centre of the bob above the bench is 10.0 cm. Give the bob a small sideways displacement and release it so that it oscillates. Record in Table 2.1 the time taken for 20 complete oscillations. Record your times to the nearest second. Table 2.1 h / cm time for 20 oscillations / s period T / s T 2 / s2 10.0 20.0 30.0 40.0 Repeat the procedure for heights h of 20.0 cm, 30.0 cm and 40.0 cm. Record the times for 20 oscillations for each height, in Table 2.1. [3] (b) (i) Use your results in Table 2.1 to calculate the period T of the pendulum for each set of readings. Remember that the period is the time for one complete oscillation. Record your values in Table 2.1. [1] (ii) Calculate the value of T 2 for each set of readings and enter your values in Table 2.1 to 2 decimal places. [1] (c) (i) On the grid provided, plot a graph of T 2 / s2 (vertical axis) against h / cm (horizontal axis). Start both axes of your graph from the origin (0,0). Draw the best fit straight line.

9 © UCLES 2013 0653/52/M/J/13 [Turn over h / cm T 2 / s2 [3] (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 of line = [2]

10 © UCLES 2013 0653/52/M/J/13 For Examiner's Use 3 Three solutions A, B and C are ammonia solution, dilute hydrochloric acid and sodium hydroxide solution. It is not known which solution is which. You are going to carry out the following tests on solutions A, B and C to identify them. Place about 1 cm3 of each solution A, B and C into separate test-tubes. Label your test-tubes so that you know which solution is in which test-tube. (a) Add 3 drops of Universal Indicator to the separate portions of the solutions A, B and C in the test-tubes and record the final colours in the row of Table 3.1 marked (i). Pour each solution into the waste beaker. Wash out the test-tubes between each test. Carry out the tests (ii) and (iii) as described in Table 3.1. Use separate portions of about 1 cm3 of solutions A, B and C in test-tubes and record the observations in the rows of Table 3.1 marked (ii) and (iii) respectively. Table 3.1 test solution A solution B solution C (i) add 3 drops of Universal Indicator [1] (ii) add an equal volume of silver nitrate solution [2] (iii) add a few drops of copper sulfate solution [3]

11 © UCLES 2013 0653/52/M/J/13 For Examiner's Use (b) Use your observations in Table 3.1 to make the following conclusions. (i) State which solutions are shown to be alkaline by test (a)(i). [1] (ii) State which solution is ammonia solution and state which test, other than (a)(i), confirms this. ammonia solution is solution confirmed by [1] (iii) State which solution is sodium hydroxide and state which test, other than (a)(i), confirms this. sodium hydroxide is solution confirmed by [1] (iv) State which solution is hydrochloric acid and state which test, other than (a)(i), confirms this. hydrochloric acid is solution confirmed by [1]

12 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 0653/52/M/J/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 May/June 2013 series 0653 COMBINED SCIENCE 0653/52 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 May/June 2013 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components. www.XtremePapers.com

Page 2 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0653 52 © Cambridge International Examinations 2013 1 (a) both leaves drawn ; clear pencil drawings ; drawings show leaf veins ; drawings clearly show which parts are covered with black paper ; [4] (b) both leaves clearly drawn with pencil ; leaf A is all brown ; leaf B is blue-black (where there was not tape) ; [3] (c) last column has ‘no’ in first three boxes ; last column has ‘yes’ in fourth box ; [2] colour obtained with iodine starch is present (yes or no) leaf from plant A area covered by black paper brown no area not covered by black paper brown no leaf from plant B area covered by black paper brown no area not covered by black paper blue-black yes plant A uncovered area covered area plant B uncovered area covered area plant A plant B brown (throughout) blue-black blue-black brown

Page 3 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0653 52 © Cambridge International Examinations 2013 (d) carbon dioxide is needed (for photosynthesis) ; (ignore references to light etc) [1] [Total: 10] 2 (a) all time values recorded ; all time values to the nearest second ; time values decreasing ; [3] (b) (i) complete set of T values calculated correctly (2 significant figures or more) ; [1] (ii) complete set of T2 values calculated correctly to 2 decimal places ; [1] (c) (i) suitable choice of scales including the origin ; points plotted correctly to half a small square ; good best fit straight line judgement ; [3] (ii) indication on graph of how data obtained ; calculation of gradient ; [2] [Total: 10] 3 (a) (i) solution A solution B solution C purple / blue purple / blue red / pink all three correct for 1 mark (ignore pH values) ; [1] (ii) solution A solution B solution C brown (ppt) ; no visible reaction / no ppt / no change / colourless (solution) white ppt ; (not cloudy / milky) [2] (iii) solution A solution B solution C blue (ppt) ; dark blue solution ; (ignore blue ppt) blue solution / no visible reaction (not ‘no change’) both shaded boxes from (ii) and (iii) for 1 mark ; [max 3]

Page 4 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0653 52 © Cambridge International Examinations 2013 (b) (i) A and B ; [1] (ii) B and test (a)(iii) / CuSO4; [1] (iii) A and test (a)(iii) / CuSO4 ; OR A and test (a)(ii) / AgNO3 if brown ppt obtained ; [max 1] (iv) C and test (a)(ii) / AgNO3 ; [1] [Total: 10]