Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2016 Oct/Nov Paper 5 · Variant 1

This document consists of 13 printed pages and 3 blank pages. DC (KN/FD) 119038/5 © UCLES 2016 [Turn over * 6 8 2 0 1 6 8 3 8 6 * CO-ORDINATED SCIENCES 0654/51 Paper 5 Practical Test October/November 2016 2 hours 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 an HB 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. Notes for Use in Qualitative Analysis for this paper are printed on page 16. 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. Cambridge International Examinations Cambridge International General Certificate of Secondary Education For Examiner’s Use 1 2 3 Total

2 0654/51/O/N/16 © UCLES 2016 1 You are going to investigate the movement of molecules through a membrane. (a) Read through the whole of the question and then complete the headings in Table 1.1. [2] • Take a piece of dialysis tubing. It is closed at one end with a knot. • Rub gently at the open end to separate the sides and open the end without the knot. • Using a syringe, add 2 cm3 of starch solution to the inside of the dialysis tubing. Take care not to spill any on the outside of the dialysis tubing. Tie the open end with a knot to enclose the starch solution inside and make a soft tubing bag, as shown in Fig. 1.1. bag of starch solution Fig. 1.1 • Rinse the outside of the bag with water and dry the outside with a paper towel, ensuring that there is no starch solution on the outside, particularly in the creases by the knots. Place the bag on a clean paper towel. • Repeat the procedure to make another bag of starch solution with the second piece of dialysis tubing. (b) (i) In Table 1.1, record the colour of the starch solution inside the tubing bags for time = 0. [1] • Half fill beaker A with water. • Place one bag into beaker A as shown in Fig. 1.2. Push gently with the stirring rod to submerge the centre of the bag if necessary. bag of starch solution beaker A water Fig. 1.2

3 0654/51/O/N/16 © UCLES 2016 [Turn over • Beaker B contains iodine solution. Place the second bag into beaker B as shown in Fig. 1.3. Use the stirring rod to gently submerge the centre of the bag if necessary. • Take care, as iodine solution can stain skin and clothing. beaker B iodine solution bag of starch solution Fig. 1.3 (ii) Start the stopwatch and record in Table 1.1 the colour of the solution inside the tubing bags every 2 minutes for 10 minutes. [3] Table 1.1 … / … … … 0 2 4 6 8 10

4 0654/51/O/N/16 © UCLES 2016 (c) Dialysis tubing allows some molecules to pass through it, but starch molecules are too large to pass through. Use this information and your results for beaker B to explain your observations. … … … …[3] (d) Explain the purpose of beaker A in this experiment. …[1] (e) Amylase is an enzyme that breaks down starch into reducing sugar. (i) Predict what you would observe if you now add amylase to the contents of the bag in beaker B and leave it in a warm place for a few minutes. Do not carry out this procedure. … …[1] (ii) Explain your answer to (e)(i). … …[1] (iii) Describe a test you could carry out to confirm that reducing sugar has been produced. Include the observation for a positive result in your answer. … … … …[3]

5 0654/51/O/N/16 © UCLES 2016 [Turn over Please turn over for Question 2.

6 0654/51/O/N/16 © UCLES 2016 2 Solution J contains a mixture of two salts with the same anion. One of the cations in J is the ammonium ion. Solid L is an element. You are going to carry out some experiments to identify the anion, the other cation in J and the element L. (a) Carry out tests in test-tubes to identify the other cation and the anion in solution J, choosing only from the following reagents. barium nitrate solution dilute nitric acid silver nitrate solution sodium hydroxide solution Use only small amounts of solution J for each test. Record the tests, observations and conclusions which identify the other cation and the anion in J. cation test … … … observations … … … conclusion … anion test … … … observations … … … conclusion … [4]

7 0654/51/O/N/16 © UCLES 2016 [Turn over (b) (i) • Place a spatula-full of solid L in a test-tube. Add dilute hydrochloric acid until the test-tube is half-full. • Warm the test-tube gently for a short time to increase the rate of reaction. • Test the gas produced. • Stir carefully and allow the mixture to react for a further three minutes. • Record your observations, the gas test and result of the gas test and the name of the gas produced. • Keep the mixture for (b)(ii). observations … … … gas test and result … … … gas produced … [4] (ii) Filter the mixture from (b)(i) into a large test-tube. Slowly add sodium hydroxide solution to the filtrate in the large test-tube until there are no further changes. Record your observations and identify the element L. observations … … … … element L is … [3]

8 0654/51/O/N/16 © UCLES 2016 (c) (i) Place one spatula-full of magnesium powder in a test-tube. Add solution J to the magnesium powder until the test-tube is half-full. Shake once. Record your observations. observations … … … After three minutes, filter the mixture into a large test-tube and record the appearance of the filtrate. Keep the filtrate for (c)(ii). appearance of filtrate … … [2] (ii) Add sodium hydroxide solution slowly to approximately 2 cm3 of the filtrate from (c)(i) in a test-tube until there is no further change. Record your observations. observations … … …[1] (d) Using your observations and conclusions in (a) and (c), suggest what has happened to the other cation (not ammonium) in solution J. … … …[1]

9 0654/51/O/N/16 © UCLES 2016 [Turn over 3 You are going to investigate the period of a simple pendulum and determine a value for the acceleration due to gravity. The period of a pendulum is the time for one complete swing (oscillation) of the pendulum. This is shown in Fig. 3.1, where the period is the time taken for the bob to swing from P to Q and back to P again. P Q point of support pendulum bob Fig. 3.1 The pendulum has been set up for you as shown in Fig. 3.2. pendulum bob bench clamp l Fig. 3.2 The length l of the pendulum is the distance from the point of support to the centre of the pendulum bob.

10 0654/51/O/N/16 © UCLES 2016 (a) (i) Measure the length l of the pendulum to the nearest 0.1 cm. Record your result in the first row of Table 3.1. [1] (ii) Describe a precaution that you took to measure l as accurately as possible. You may draw a diagram if you wish. … …[1] (b) (i) Give the pendulum bob a small sideways displacement (between 5 cm and 10 cm) and release it so that it oscillates. Measure and record in Table 3.1 the time taken for 20 oscillations. Record this time to one decimal place. [2] (ii) Adjust the length l of the pendulum until it is 50.0 cm. Repeat the procedure described in (b)(i). [1] (iii) Repeat the procedure in (b)(i) for lengths l of 40.0 cm, 30.0 cm and 20.0 cm. [1] Table 3.1 l / cm time for 20 oscillations / s period T / s T 2 / s2 50.0 40.0 30.0 20.0 (c) (i) Use your results in Table 3.1 to calculate the period T of the pendulum for each set of readings. Remember that the period is the time for one oscillation. Record your values in Table 3.1. [1] (ii) Calculate the value of T 2 for each set of readings and record in Table 3.1 your values to one decimal place. [1]

11 0654/51/O/N/16 © UCLES 2016 [Turn over (d) (i) On the grid provided, plot a graph of T 2 (vertical axis) against l (horizontal axis). Start both axes of your graph from the origin (0, 0). Draw the best-fit straight line. T 2 / s2 l / cm [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]

12 0654/51/O/N/16 © UCLES 2016 (e) The acceleration due to gravity g is given by the equation shown. g = 0.395 gradient Use this equation to calculate a value for g. g = …m / s2 [1] (f) Compare your measured value of g from part (e) with the actual value of 9.8 m / s2. Comment on whether or not your measured value of g from part (e) agrees with the actual value of 9.8 m / s2. Justify your answer with reference to your results. … … …[1]

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16 0654/51/O/N/16 © UCLES 2016 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. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after the live examination series. 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. NOTES FOR USE IN QUALITATIVE ANALYSIS Tests 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 with dilute nitric acid, then add aqueous barium nitrate white ppt. Tests 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 Tests for gases gas test and test result ammonia (NH3) turns damp, red litmus paper blue carbon dioxide (CO2) turns limewater milky chlorine (Cl 2) bleaches damp litmus paper hydrogen (H2) ‘pops’ with a lighted splint oxygen (O2) relights a glowing splint

® IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 5 printed pages. © UCLES 2016 [Turn over Cambridge International Examinations Cambridge International General Certificate of Secondary Education CO-ORDINATED SCIENCES 0654/51 Paper 5 Practical Test October/November 2016 MARK SCHEME Maximum Mark: 45 Published 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 2016 series for most Cambridge IGCSE®, Cambridge International A and AS Level components and some Cambridge O Level components.

Page 2 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 51 © UCLES 2016 Question Answer Mark 1(a) time / minutes ; (beaker) A and (beaker) B / water and iodine solution ; 2 1(b)(i) initial observation for both as cloudy / colourless / milky / white ; 1 1(b)(ii) full set of results for both beakers ; beaker A – no change to observation ; beaker B – observation changes to blue-black / black ; 3 1(c) iodine (molecules) move into bag ; by diffusion / because molecules are small enough ; starch and iodine produce blue-black / black / darker colour ; 3 1(d) control / to show effect of water / to show effect without iodine ; 1 1(e)(i) (blue-black) colour goes / colour fades / goes brown / goes orange / goes yellow ; 1 1(e)(ii) no starch left / no starch – iodine complex ; 1 1(e)(iii) Benedict’s solution ; heat / hot water bath ; green / yellow / orange / red ; 3 Total: 15

Page 3 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 51 © UCLES 2016 Question Answer Mark 2(a) cation add sodium hydroxide solution / NaOH AND green ppt. ; (ALLOW gas changes red litmus to blue) iron(II) / Fe2+ ; (DO NOT ALLOW ammonium if alternative observation given because ammonium given in question) anion add barium nitrate (solution) / Ba(NO3)2 AND white ppt. ; ALLOW barium chloride sulfate / SO4 2– ; 4 2(b)(i) colourless solution ; fizzing / bubbles / effervescence ; lighted splint pops ; hydrogen / H2 (depends on use of splint) ; 4 2(b)(ii) white ppt. ; ppt. dissolves / becomes colourless solution ; (element L is) zinc / Zn ; independent mark 3 2(c)(i) observations: effervescence / bubbles / fizzing / gets hot ; filtrate: colourless / paler green ; 2 2(c)(ii) white ppt. / faint ppt. / milky / no ppt. ; 1

Page 4 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 51 © UCLES 2016 Question Answer Mark 2(d) displacement / redox / cation reduced / Fe2+ goes to Fe / Fe2+ disappears / (cation) reacted ; 1 Total: 15 Questions Answer Mark 3(a)(i) l present to the nearest millimetre AND 60.0 ± 0.2 ; 1 3(a)(ii) appropriate precaution (either written or shown on diagram): take reading at eye level / use of set square to ensure rule vertical / use of fiducial aid / place ruler close to pendulum ; 1 3(b)(i) time recorded to 1 decimal place ; sensible time = 31 s ± 0.5 (accuracy mark) ; 2 3(b)(ii) time recorded and less than that in (i) ; 1 3(b)(iii) all time values recorded with pattern of decreasing times ; 1 3(c)(i) T values calculated correctly (ignore no. of decimal places) ; 1 3(c)(ii) complete set of T2 values recorded, correctly rounded to 1 decimal place ; 1 3(d)(i) suitable choice of scales (more than half the grid used) AND from (0,0) ; at least 4 plots correct to ½ small square ; good best-fit straight line judgement ; 3 3(d)(ii) triangle method indicated on graph AND more than half the line used ; correct calculation from graph ; 2 3(e) 9.8 ± 0.3 (accuracy mark) ; 1

Page 5 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 51 © UCLES 2016 Question Answer Mark 3(f) yes agree – values close enough allowing for experimental error OR no disagree – difference too large to be attributed to experimental error ; 1 Total: 15