Cambridge IGCSE Science - Combined 0653 — 2008 May/June Paper 5 · Variant 1

This document consists of 9 printed pages and 3 blank pages. IB08 06_0653_05/RP © UCLES 2008 [Turn over *1336026773* For Examiner's Use 1 2 3 Total UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education COMBINED SCIENCE 0653/05 Paper 5 Practical Test May/June 2008 1 hour 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in Instructions to Supervisors. 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, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES Answer all questions. 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

2 © UCLES 2008 0653/05/M/J/08 For Examiner's Use 1 The upward movement of water through a plant is called the transpiration stream. It provides a continuous supply of water to replace water vapour transpired by the leaves. Specimen A is a twig from a tree. It was removed from a tree a few hours ago. (a) (i) Make a drawing of specimen A in the space below. You need to include no more than two leaves in your drawing. [2] (ii) What has caused wilting in some parts of specimen A? [2] (iii) Using a pencil, shade the parts of specimen A that have not wilted. [1] (iv) Why has specimen A not wilted in the shaded area? How does this help the survival of the plant? [2]

3 © UCLES 2008 0653/05/M/J/08 [Turn over For Examiner's Use (b) Specimen B is part of a stalk of celery that has been standing in a coloured dye for several hours. Use a sharp knife or scalpel to make a transverse (cross) section of the stalk. Place this section flat on the white tile. Make a drawing of the section in the space below. Label the places where you can see the dye with the correct name for the tissue. [2] (c) The rate of transpiration is dependent on several environmental factors, including the temperature. State one other factor. [1]

4 © UCLES 2008 0653/05/M/J/08 For Examiner's Use 2 You are going to test whether or not the extension of a spring is directly proportional to the applied force. (a) • Hang the spring from the stand. • Make sure you have left enough room for the spring to stretch at least 30 cm to ensure that the coils are just separated. • Fix the metre rule in a vertical position beside the spring with the zero mark at the bottom. • Attach the carrier or a small mass to the spring. • With a small piece of plasticine, fix the pin P to the spring as shown in Fig. 2.1 so that the pin acts as a pointer. • 0 metre rule pin P h0 Fig. 2.1 (i) Take the reading on the rule of the height h0. Record this value in mm in Fig. 2.2. Add a 50 g mass to the carrier and read the new height, h, of the pointer. Record this value in Fig. 2.2. Repeat by adding further masses to obtain 3 more sets of readings. Read and record the new value of h after each addition. (ii) Complete the table, Fig. 2.2. You will see that the mass is to be converted into a force. (1kg is 10 N). Calculate the total increase in length of the spring each time. total mass added / g force / N pointer reading h / mm total increase in length (extension) h0 - h / mm 0 0 h0 = 0 50 0.5 [4] Fig. 2.2

5 © UCLES 2008 0653/05/M/J/08 [Turn over For Examiner's Use (b) Plot a graph of the extension of the spring (vertical axis) against the force. Draw the best straight line through your points. Before choosing your scale make sure you will be able to answer part (c). [3] extension / mm force / N

6 © UCLES 2008 0653/05/M/J/08 For Examiner's Use (c) Use your graph to find the extension produced by a force of 0.40 N. extension = mm [1] (d) Do your results show that the extension is proportional to the force? Explain your answer. [2]

8 © UCLES 2008 0653/05/M/J/08 For Examiner's Use 3 You are provided with three solutions, A, B and C. The solutions are known to be sulphuric acid, sodium carbonate and calcium hydroxide (limewater), but not necessarily in that order. Carry out the following tests to enable you to identify each of the solutions A, B and C. Some of the tests will produce no visible reaction. Simply record ‘no reaction’ in the appropriate space. (a) (i) Place about 2 cm3 of solution A into a test-tube. Add a small piece of magnesium and record any observation in Fig. 3.1. (ii) Repeat using solution B and then solution C. Record all your observations in Fig. 3.1. addition of magnesium to each of solutions A, B and C A B C Fig. 3.1 [2] (b) You now need to pass carbon dioxide into each solution. Produce the carbon dioxide by adding dilute hydrochloric acid to some solid calcium carbonate, (marble chips) in a test-tube. Immediately after adding the acid to the calcium carbonate, insert the bung and delivery tube. Allow some of the gas produced to be reacted with each of solutions A, B and C. Use about 5cm3 of each solution. You will need to use a further supply of calcium carbonate and hydrochloric acid to produce the carbon dioxide if the effervescence has ceased before you have tested each solution. Record your observations in Fig. 3.3. pass carbon dioxide gas into each of solutions A, B and C A B C Fig. 3.3 [2]

9 © UCLES 2008 0653/05/M/J/08 For Examiner's Use (c) (i) Place about 2 cm3 of solution A in a test-tube. Add a small quantity of solution B Record your observation. observation [1] (ii) Repeat (i) using solution C instead of B. observation [1] (d) Using the observations above suggest the identity of solutions A, B and C. A is because B is because C is because [4]

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 2008 0653/05/M/J/08 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 sulphate (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 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

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2008 question paper 0653 COMBINED SCIENCE 0653/05 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. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination. • CIE will not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the May/June 2008 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Page 2 Mark Scheme Syllabus Paper IGCSE – May/June 2008 0653 05 © UCLES 2008 1 (a) (i) good quality drawing, sharp pencil, clear outline; (1) leaves obviously wilted, or 1 or more leaves partially shaded (1) [2] (ii) lack of water; water lost from leaves by evaporation/transpiration; OR water not replaced through stem; [2] (iii) stem of twig clearly shaded in; [1] (iv) wood/lignin (provides support;) provides support even when water is scarce; [2] (b) good quality drawing, sharp pencil, clear outline; xylem clearly labelled in at least one place; [2] (c) wind speed humidity/light intensity/availability of water [1] [Total: 10] 2 (a) Table value for h0 must be in mm; complete set (first three columns) of readings (good range) must be sensible; mass correctly converted to newtons; extension correct for each reading; [4] (b) scale is sensible; plotting correct; line is OK must pass through zero; [3] (c) correct from graph; [1] (d) yes, (1) straight line force is proportional to extension [2] [Total: 10]

Page 3 Mark Scheme Syllabus Paper IGCSE – May/June 2008 0653 05 © UCLES 2008 3 (a) (i) & (ii) A and C no reaction; allow slight bubbling with A B fizzes; [2] (b) A and B no reaction; C milky; [2] (c) (i) fizzing; [1] (ii) white ppt.; [1] (d) A is sodium carbonate B is sulphuric acid C is limewater [1] Each correct reason [3] [Total: 10]