Cambridge IGCSE Science - Combined 0653 — 2009 May/June Paper 2 · Variant 1

This document consists of 21 printed pages and 3 blank pages. IB09 06_0653_02/2RP © UCLES 2009 [Turn over *5411268317* For Examiner's Use 1 2 3 4 5 6 7 8 9 Total UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education COMBINED SCIENCE 0653/02 Paper 2 (Core) May/June 2009 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. 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 soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. A copy of the Periodic Table is printed on page 24. 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 2009 0653/02/M/J/09 For Examiner's Use 1 Fig. 1.1 shows a section through a tooth. A B C Fig. 1.1 (a) Name parts A, B and C. A B C [3] (b) Explain how teeth help with digestion. [2] (c) Name one mineral and one vitamin that are essential for the growth of strong teeth and bones. mineral vitamin [2]

3 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use 2 (a) A student investigated how a change in potential difference across a lamp affected the current flowing through it. She used wires to connect the components shown in Fig. 2.1 to make a circuit. V A Fig. 2.1 (i) Using the correct symbols from Fig. 2.1, draw a diagram to show the circuit she used. [3] (ii) Explain why the variable resistor is included in the circuit. [1]

4 © UCLES 2009 0653/02/M/J/09 For Examiner's Use (iii) Her results are shown in Table 2.1. Table 2.1 potential difference across lamp / V current through lamp / A resistance of lamp filament / Ω 4 1.2 3.3 8 1.5 12 1.7 7.1 Complete the table by calculating the missing resistance and writing your answer in the empty box. State the formula that you use and show your working. formula working [2]

5 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (b) Electricity can kill. Identify and explain the electrical hazard shown in Fig. 2.2. Fig. 2.2 [2]

6 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 3 (a) The names of six elements are shown below. carbon chlorine cobalt neon silicon sodium Choose the element from the list which is the least reactive, which is used to sterilise drinking water, which is a metal that forms coloured compounds. [3] (b) Fig. 3.1 shows a diagram of an atom. + + + + + + – – – – – – Fig. 3.1 (i) State the nucleon number (mass number) of the atom shown in Fig. 3.1. [1] (ii) State the name of the element made of atoms like the one in Fig. 3.1. Explain your answer briefly. element explanation [2]

7 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (c) Fig. 3.2 shows a test for a gas which is produced when a solid element A reacts in a solution B. pop burning splint solution B element A Fig. 3.2 Name the gas produced in this reaction, and suggest the names of element A and solution B. gas element A solution B [3]

8 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 4 Fig. 4.1 shows an arum lily. Arum lilies have flowers that are pollinated by insects. There are many tiny flowers on a stalk, inside a large white structure called a spathe. leaf flowers on stalk spathe Fig. 4.1 (a) (i) Name the part of the flower in which pollen is made. [1] (ii) What does a pollen grain contain? [1] (iii) Explain the meaning of the term pollination. [2]

9 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (b) Arum lilies produce heat energy to raise the temperature of the flowers. This helps to attract insects to the flowers. They use respiration to do this. A researcher investigated whether there was a relationship between the temperature of the flowers inside an arum lily spathe and the rate of oxygen use. He took 15 arum lilies, and measured the temperature and rate of oxygen use for each one. Fig. 4.2 shows his results. 0 5 10 15 20 25 temperature inside spathe / °C rate of oxygen use Fig. 4.2 (i) Describe the relationship between the temperature inside the spathe and the rate of oxygen use by the arum lily. [1] (ii) Explain the reasons for the relationship you have described. [2]

10 © UCLES 2009 0653/02/M/J/09 For Examiner's Use (c) The fuel that the arum lilies use to produce the heat energy is glucose. Describe how the lilies obtain a supply of glucose. [2] (d) The leaves of arum lilies contain palisade cells, which are typical plant cells containing chloroplasts. Complete the diagram of a palisade cell. Include these structures in your labels. cell membrane cell wall chloroplast cytoplasm nucleus vacuole [4]

11 0653/02/M/J/09 [Turn over BLANK PAGE Please turn over for Question 5.

12 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 5 The Vikings, who lived in Scandinavia about 1200 years ago, sailed in boats called longships across the sea to Britain. (a) (i) They travelled 900 km in 150 hours. Calculate their average speed for this journey. State the formula that you use and show your working. formula working km / h [2] (ii) At one stage on their journey they were travelling at 7.2 km / h. Calculate their speed in m / s. Show your working. m / s [1] (b) A longship was moving at constant speed. The diagram shows four forces acting on it. weight friction thrust upthrust Name two forces which must be equal in size. [1]

13 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (c) The Vikings used animal furs to make clothes to keep them warm. Explain in terms of conduction and convection how fur clothes would have kept the Vikings warm. [3] (d) The volume of the wood used to construct the longship was 9 m3. If the density of the wood was 800 kg / m3, calculate the mass of the wood used. State the formula that you use and show your working. formula working kg [2] (e) The major energy source used to propel the longship was the wind. Wind is a renewable energy source. (i) Name one other renewable energy source. [1] (ii) Name one non–renewable energy source. [1]

14 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 6 (a) Fig. 6.1 shows industrial apparatus used for the fractional distillation of petroleum (crude oil). Q R S fraction 70–190 °C 250–340 °C below 30 °C 190–250 °C range of boiling points hot petroleum P Fig. 6.1 Draw lines on Fig. 6.1 connecting the fractions, P, Q, R and S to the correct boiling point range. The line for fraction Q has been drawn for you. [2] (b) Plastics and steel are both used to make buckets. bucket Fig. 6.2 (i) Suggest one reason why plastics are suitable materials from which to make buckets. [1]

15 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (ii) Buckets made from steel must be protected from rusting. Name the element and the compound which react with mild steel to form rust. element compound [2] (iii) Describe briefly one suitable method of protecting a steel bucket from rusting. [1] (iv) Name the element which is oxidised when rust forms. [1] (v) Name the alloy from which cutlery is made. cutlery Fig. 6.3 [1]

16 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 7 Read the following description of a food web. • Ants collect leaves from trees and take them into their nests. • A fungus grows on the leaves and breaks them down. • The ants eat the leaves, and also the fungus. • Small birds eat the ants, and hawks eat the small birds. • Pangolins eat only ants. a pangolin Fig. 7.1 (a) In the space below, complete a food web that includes all of the organisms described in Fig. 7.1. leaves [3]

17 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (b) (i) Name the producer in this food web. [1] (ii) Name a decomposer in this food web. [1] (c) Pangolins are becoming rare in some parts of the world. Use the information in Fig. 7.1, and your own knowledge, to explain why it is important to prevent deforestation if we want to conserve pangolins. [2]

18 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 8 (a) A hotel has a lift (elevator). It moves through a vertical height of 3 m between each floor. Fig. 8.1 (i) A passenger travels in the lift. The passenger has a mass of 80 kg and weighs 800 N. The mass of the empty lift is 1200 kg. Calculate the total weight of the passenger and lift. Show your working. N [2] (ii) Calculate the work done when the lift and passenger move up three floors, from Floor 1 to Floor 4. State the formula that you use and show your working. formula working J [2]

19 © UCLES 2009 0653/02/M/J/09 [Turn over For Examiner's Use (b) (i) In the restaurant, music is being played through loudspeakers. Explain how the sound coming from the loudspeakers reaches the people in the restaurant. [2] (ii) The amplitude of the sound waves is increased. What effect will this have on the sounds heard by the people in the restaurant? [1]

20 © UCLES 2009 0653/02/M/J/09 For Examiner's Use 9 Fig. 9.1 shows the main steps in a method used by a student to make salts. In separate experiments the student reacted the carbonate of a metal and the oxide of a metal with dilute sulfuric acid. dilute sulfuric acid powdered metal carbonate dilute sulfuric acid powdered metal oxide gentle heat gentle heat gentle heat process A process B Fig. 9.1 (a) Name processes A and B shown in Fig. 9.1. process A process B [2] (b) Suggest and explain why the student used powdered solids in the reactions with dilute sulfuric acid. [2]

21 © UCLES 2009 0653/02/M/J/09 For Examiner's Use (c) (i) Name the salt which is produced when zinc oxide reacts with dilute sulfuric acid. [1] (ii) Complete the word equation for the reaction of copper carbonate with sulfuric acid. copper carbonate sulfuric acid + + + [2] (d) (i) The salt calcium chloride is made when calcium oxide reacts with hydrochloric acid. The symbolic equation for this reaction is shown below. CaO + HCl → CaCl2 + H2O Explain whether or not this equation is balanced. [2] (ii) A student reacted calcium oxide with hydrochloric acid using the apparatus shown in Fig. 9.2. calcium oxide hydrochloric acid thermometer Fig. 9.2 The student noticed that the temperature of the mixture increased. Explain this observation. [1]

24 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 2009 0653/02/M/J/09 Group 140 Ce Cerium 58 141 Pr Praseodymium 59 144 Nd Neodymium 60 Pm Promethium 61 150 Sm Samarium 62 152 Eu Europium 63 157 Gd Gadolinium 64 159 Tb Terbium 65 162 Dy Dysprosium 66 165 Ho Holmium 67 167 Er Erbium 68 169 Tm Thulium 69 173 Yb Ytterbium 70 175 Lu Lutetium 71 232 Th Thorium 90 Pa Protactinium 91 238 U Uranium 92 Np Neptunium 93 Pu Plutonium 94 Am Americium 95 Cm Curium 96 Bk Berkelium 97 Cf Californium 98 Es Einsteinium 99 Fm Fermium 100 Md Mendelevium 101 No Nobelium 102 Lr Lawrencium 103 1 H Hydrogen 1 7 Li Lithium 3 23 Na Sodium 11 24 Mg Magnesium 12 40 Ca Calcium 20 45 Sc Scandium 21 48 Ti Titanium 22 51 V Vanadium 23 52 Cr Chromium 24 55 Mn Manganese 25 56 Fe Iron 26 59 Co Cobalt 27 59 Ni Nickel 28 64 Cu Copper 29 65 Zn Zinc 30 70 Ga Gallium 31 27 Al Aluminium 13 11 B Boron 5 12 C Carbon 6 14 N Nitrogen 7 16 O Oxygen 8 19 F Fluorine 9 28 Si Silicon 14 31 P Phosphorus 15 32 S Sulfur 16 35.5 Cl Chlorine 17 40 Ar Argon 18 20 Ne Neon 10 4 He Helium 2 73 Ge Germanium 32 75 As Arsenic 33 79 Se Selenium 34 80 Br Bromine 35 84 Kr Krypton 36 39 K Potassium 19 88 Sr Strontium 38 89 Y Yttrium 39 91 Zr Zirconium 40 93 Nb Niobium 41 96 Mo Molybdenum 42 Tc Technetium 43 101 Ru Ruthenium 44 103 Rh Rhodium 45 106 Pd Palladium 46 108 Ag Silver 47 112 Cd Cadmium 48 115 In Indium 49 119 Sn Tin 50 122 Sb Antimony 51 128 Te Tellurium 52 127 I Iodine 53 131 Xe Xenon 54 137 Ba Barium 56 139 La Lanthanum 57 * 178 Hf Hafnium 72 181 Ta Tantalum 73 184 W Tungsten 74 186 Re Rhenium 75 190 Os Osmium 76 192 Ir Iridium 77 195 Pt Platinum 78 197 Au Gold 79 201 Hg Mercury 80 204 Tl Thallium 81 207 Pb Lead 82 209 Bi Bismuth 83 Po Polonium 84 At Astatine 85 Rn Radon 86 Fr Francium 87 227 Ac Actinium 89 9 Be Beryllium 4 I II III IV V VI VII 0 85 Rb Rubidium 37 133 Cs Caesium 55 226 Ra Radium 88 The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.). a X b a = relative atomic mass X = atomic symbol b = proton (atomic) number Key *58-71 Lanthanoid series 90-103 Actinoid series DATA SHEET The Periodic Table of the Elements

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2009 question paper for the guidance of teachers 0653 COMBINED SCIENCE 0653/02 Paper 2 (Core Theory), maximum raw mark 80 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 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 2009 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: Teachers’ version Syllabus Paper IGCSE – May/June 2009 0653 02 © UCLES 2009 1 (a) A enamel ; B dentine ; C pulp/blood vessel/nerve ; [3] [reject root] (b) break down large pieces of food to small ones ; increase surface area ; making it easier for enzymes to act ; [max 2 ] (c) calcium/phosphate ; D ; [2] [Total: 7] 2 (a) (i) all symbols shown ; voltmeter in parallel with lamp only ; all other components in series ; [3] (ii) to vary current (through lamp)/voltage/PD (across lamp) ; [1] [ignore refs. to power if with correct statements] (iii) (R =) V/I ; = 5.3 ; [2] [accept words] [accept only suitable symbols, so V/I (= ohms) is accepted but V/A is not] (b) damaged outer insulation/owtte ; short circuit/risk of shock/risk of fire ; [2] [Total: 8] 3 (a) neon ; chlorine ; cobalt ; [3] (b) (i) 12 ; [1] (ii) carbon ; (nucleus/atom has) 6 protons/it has a proton number 6 ; [2] [accept other unambiguous statements] (c) hydrogen ; appropriate metal e.g. Ca Mg Al Zn Fe ; [reject Group 1] suitable acid – could be several correct answers but expect HCl H2SO4 HNO3 ; [3] [Total: 9]

Page 3 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2009 0653 02 © UCLES 2009 4 (a) (i) anther/stamen ; [1] (ii) male gametes ; [1] (iii) the transfer of pollen ; to a stigma ; [2] (b) (i) the higher the temperature, the more oxygen is used ; [1] (ii) respiration ; aerobic ; using oxygen to produce heat ; by breaking down glucose ; [max 2] (c) photosynthesis ; (using) light/sunlight ; combining water and carbon dioxide/correct equation ; [max 2] (d) cell wall drawn and labelled ; cell membrane labelled immediately inside the cell wall ; nucleus drawn and labelled, in the cytoplasm ; chloroplast drawn and labelled, in the cytoplasm ; vacuole drawn and labelled ; [max 4] [Total: 13] 5 (a) (i) (average speed =) distance / time ; = 900 / 150 = 6 km/h ; [2] (ii) 2 m/s ; [1] (b) friction and thrust/upthrust and weight ; [1] (c) insulation ; (trapped) air (is an insulator) ; prevents conduction/convection ; [3] (d) density = mass ÷ volume / mass = density × volume ; mass = 800 × 9 = 7200 (kg) ; [2] (e) (i) solar/sunlight/waves/tides/geothermal/biofuel/hydro (reject nuclear) ; [1] (ii) coal/oil/gas/(named) fossil fuel/peat (reject nuclear) ; [1] [Total: 11]

Page 4 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2009 0653 02 © UCLES 2009 6 (a) P 70–190 °C 250–340 °C Q R below 30 °C S 190–250 °C (2 marks for 3 correct, 1 mark for 1 or 2 correct) [2] (b) (i) plastic buckets lighter (to carry) ; flexible, not bent out of shape in use ; no reaction with content of bucket impermeable ; easily be shaped ; [max 1] (ii) oxygen ; water ; [2] (iii) galvanising/cover in layer of zinc/painting ; [1] (iv) iron ; [1] (v) stainless steel ; [1] [Total: 8]

Page 5 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2009 0653 02 © UCLES 2009 leaves fungus ants small birds pangolins hawks 7 (a) all organisms included ; all connected correctly by lines ; with correct arrow heads ; [3] (b) (i) leaves/trees ; [1] (ii) fungus ; [1] (c) ref. to loss of habitat ; pangolins eat ants, which eat leaves ; if fewer leaves then fewer ants so fewer pangolins ; [max 2] [Total: 7] 8 (a) (i) weight of empty lift = 12000 N ; combined weight = 12800 N ; [2] (ii) W = F × D ; [accept (work done =) height × (total) weight] = 12 800 x 9 =115 200 J ; [2] ecf for incorrect total weight from (i) (b) (i) vibrations ; of molecules/particles ; longitudinal wave ; compressions and rarefactions ; [max 2] (ii) louder ; [1] [Total: 7]

Page 6 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2009 0653 02 © UCLES 2009 9 (a) A filtration ; B evaporation/crystallization ; [2] (b) to speed up the reaction ; (powders have) a greater surface area (which speeds reaction) ; [2] (c) (i) zinc sulfate ; [1] (ii) → copper sulfate + carbon dioxide + water ; [2] (2 marks for 3 correct 1 mark for 2 correct) [reject symbols or formulae even if correct] (d) (i) (not balanced) must have the same number of each type of atom on both sides ; (reject same number of atoms needed on both sides) some correct detail e.g. 1 H on left but 2 on right/would need 2HCl ; [2] (ii) reaction is exothermic/heat given out (to surroundings) ; [1] [Total: 10]