Cambridge IGCSE Science - Combined 0653 — 2003 May/June Paper 2 · Variant 1

This document consists of 16 printed pages. MML 2981 4/02 S36361/2 © CIE 2003 [Turn over CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education COMBINED SCIENCE 0653/02 Paper 2 May/June 2003 1 hour 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 in the spaces provided on the Question Paper. 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. Answer all questions. 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. A copy of the Periodic Table is printed on page 16. Centre Number Candidate Number Name For Examiner’s Use 1 2 3 4 5 6 7 8 9 If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page. Stick your personal label here, if provided. UNIVERSITY of CAMBRIDGE Local Examinations Syndicate www.XtremePapers.com

1 Fig. 1.1 shows a fruit containing seeds. Fig. 1.1 (a) Name the part of the flower from which each of the following parts developed. the whole fruit … the seeds inside the fruit … [2] (b) A student investigated the conditions needed for the germination of these seeds. He set up the apparatus shown in Fig. 1.2. Fig. 1.2 wet cotton wool wet cotton wool dry cotton wool black paper covering 4 oC 4 oC 20 oC A B C seed sepals fruit wall 2 0653/02/M/J/03 For Examiner’s Use

The student found that the seeds in beakers A and B did not germinate. The seeds in beaker C did germinate. He concluded that the seeds needed water, a warm temperature and light in order to germinate. (i) Which two of these conclusions cannot be made from the results of this investigation? … [1] (ii) Explain your answer. … … … [2] (c) Seeds, such as beans, are a good source of carbohydrate and protein in the human diet. (i) Describe how you would test a bean seed to see if it contained starch. … [1] (ii) State what you would see if the result of the test was positive. … [1] 3 0653/02/M/J/03 [Turn over For Examiner’s Use

2 Hydrocarbons are important compounds found in crude oil (petroleum). (a) Write the names and chemical symbols of the two elements which are combined in hydrocarbon molecules. 1. name … symbol … 2. name … symbol … [2] (b) Propane is a gaseous hydrocarbon fuel. Fig. 2.1 shows apparatus used to investigate the products of complete combustion of propane. Fig. 2.1 (i) Name the colourless liquid which condenses in the U-tube. … [1] (ii) Predict and explain what is observed in the tube containing limewater. … … … [2] U-tube pump draws gases through apparatus limewater cold water colourless liquid propane 4 0653/02/M/J/03 For Examiner’s Use

3 This question is about these types of radiation: alpha radiation beta radiation gamma radiation infra-red radiation ultra-violet radiation Which of these types of radiation (a) is a stream of electrons? … [1] (b) can penetrate a thick sheet of lead? … [1] (c) causes the most ionisation? … [1] (d) are forms of electromagnetic radiation? … [2] 5 0653/02/M/J/03 [Turn over For Examiner’s Use

4 All living things have certain characteristics. These include sensitivity and movement. (a) List four other characteristics of living things. … … … … [2] (b) In humans, sensitivity and movement are coordinated by the nervous system. Name the two structures which form the central nervous system. … and … [1] (c) Alcohol affects the nervous system. A car was travelling at 12 metres per second along a city street. The driver had not drunk any alcohol. A child ran out in front of the car. The driver saw the child, and reacted by pressing his foot onto the brake. Fig. 4.1 shows the motion of the car during these events. Fig. 4.1 time/s speed / m per s driver sees child 7 6 5 4 3 2 1 0 0 4 8 12 2 6 10 14 16 6 0653/02/M/J/03 For Examiner’s Use

(i) On Fig. 4.1, draw a curve to show the motion of the car if the driver had been drinking alcohol before driving the car. [2] (ii) Using the information in Fig. 4.1, and your own knowledge about the effects of alcohol on the nervous system, explain why drivers should not drink alcohol. … … … [2] 7 0653/02/M/J/03 [Turn over For Examiner’s Use

5 Two reactions, A and B, involving metals and non-metals are carried out. (a) Fig. 5.1 shows reaction A. Fig. 5.1 (i) Reaction A is an example of oxidation. Name the substance reacting with magnesium in reaction A. … [1] (ii) Name the white solid produced in reaction A. … [1] (b) Some of the white solid produced in reaction A was shaken with water. State, with a reason, which of the following could be the pH of the mixture. 5 7 9 pH … reason … … [3] xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx strong heat magnesium white solid 8 0653/02/M/J/03 For Examiner’s Use

(c) Fig. 5.2 shows reaction B. Fig. 5.2 (i) Name the gas produced during reaction B. … [1] (ii) Suggest a word equation for reaction B. … [1] (iii) Underline the type of chemical reaction which best describes reaction B. combustion decomposition neutralisation [1] mercury oxide glowing splint re-lights heat 9 0653/02/M/J/03 [Turn over For Examiner’s Use

6 Masses were hung on a spring. The length of the spring was measured and the extension was calculated. Fig. 6.1 shows some of the results. Fig. 6.1 (a) Complete Fig. 6.1 by filling in the two missing values. [2] 10 0653/02/M/J/03 For Examiner’s Use mass / g 0 10 20 30 40 50 60 length of spring / cm extension of spring / cm 10.0 0 12.1 2.1 12.3 2.3 13.4 14.4 4.4 15.6 5.6 6.7

(b) The graph in Fig. 6.2 has been plotted for some of the values. Fig. 6.2 (i) Suggest which result was probably measured inaccurately. Explain your answer. … … [2] (ii) Use the graph to find the value of the mass needed to produce an extension of 5.0 cm. Show your working on the graph. … [2] 60 50 40 30 20 10 0 0 1 2 3 4 5 6 7 X X X X X extension/cm mass/g 11 0653/02/M/J/03 [Turn over For Examiner’s Use

(c) The masses are made of iron. A 10 g mass has a volume of 1.25 cm3. Calculate the density of iron. Show your working and state the formula that you use. formula used … working answer … g / cm3 [3] 7 (a) Complete the sentences below, using some of the words from the list. You may use each word once, or not at all. carbon dioxide conservation deforestation global warming oxygen photosynthesis soil erosion species diversity temperature Many people are worried about the loss of tropical rain forests. It is important that rain forests should be conserved, because they have a very high …………………………………… . Also, when trees have been cut down, …………………………………… is more likely to occur when there is heavy rainfall. If the trees are burnt, then …………………………………… is released into the atmosphere. An increase in the concentration of this gas in the atmosphere may lead to …………………………………… . [4] (b) Decomposers play an important role in tropical rain forests. Describe the role of decomposers in the carbon cycle. … … … [2] 12 0653/02/M/J/03 For Examiner’s Use

8 (a) Bohrium is a recently discovered element. The chemical symbol for bohrium is 267 107Bh (i) State the number of protons and the number of neutrons in the nucleus of this atom. number of protons … number of neutrons … [2] (ii) A compound of bohrium contains one atom of bohrium, three atoms of oxygen and one atom of chlorine in its molecules. Write the chemical formula of this compound. … [2] (b) Fig. 8.1 shows part of the Periodic Table. Some elements are represented by letters. These letters are not the chemical symbols of the elements. Fig. 8.1 Using only the letters shown in Fig. 8.1, choose the element that is described in each case below. Each letter may be used once or not at all. a transition metal … an element in Group 7 and the Fourth Period … the more reactive element in Group I … [3] 13 0653/02/M/J/03 [Turn over For Examiner’s Use D G B F A C E

9 Fig. 9.1 shows a simple electrical circuit. Fig. 9.1 (a) In the space below, draw the circuit diagram for the circuit in Fig. 9.1, using the correct symbols. [3] ammeter cell lamp voltmeter 14 0653/02/M/J/03 For Examiner’s Use

(b) The current flowing through the ammeter is 0.1 A and the potential difference measured by the voltmeter is 1.5 V. Calculate the resistance of the lamp. Show your working and state the formula that you use. … ohms [2] (c) Electrical devices such as an electric fire can be dangerous, especially when they are handled with wet hands. Explain why you are quite likely to be electrocuted if you handle an electrical device with wet hands rather than dry hands. … … [1] 15 0653/02/M/J/03 For Examiner’s Use

16 0653/02/M/J/03 DATA SHEET The Periodic Table of the Elements The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.). *58-71 Lanthanoid series †90-103 Actinoid series Key a = relative atomic mass X = atomic symbol b = proton (atomic) number Group I 7 Li Lithium 3 9 Be Beryllium 4 23 Na Sodium 11 24 Mg Magnesium 12 39 K Potassium 19 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 73 Ge Germanium 32 28 Si Silicon 14 12 C Carbon 6 75 As Arsenic 33 31 P Phosphorus 15 14 N Nitrogen 7 79 Se Selenium 34 32 S Sulphur 16 16 O Oxygen 8 80 Br Bromine 35 35.5 Cl Chlorine 17 19 F Fluorine 9 84 Kr Krypton 36 40 Ar Argon 18 20 Ne Neon 10 4 He Helium 2 85 Rb Rubidium 37 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 54 133 Cs Caesium 55 137 Ba Barium 56 139 La Lanthanum 57 * 178 Hf Hafnium 72 181 Ta Tantalum 73 140 Ce Cerium 58 a X b 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 103 141 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 71 184 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 87 226 Ra Radium 88 227 Ac Actinium 89 † 1 H Hydrogen 1 II III IV V VI VII 0