Cambridge IGCSE Sciences - Co-ordinated (Double) 0654 — 2016 Oct/Nov Paper 3 · Variant 3

This document consists of 32 printed pages. DC (NF/SG) 120586/5 © UCLES 2016 [Turn over Cambridge International Examinations Cambridge International General Certificate of Secondary Education * 2 7 1 2 9 6 2 0 5 0 * CO-ORDINATED SCIENCES 0654/33 Paper 3 (Extended) October/November 2016 2 hours 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 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. A copy of the Periodic Table is printed on page 32. 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.

2 0654/33/O/N/16 © UCLES 2016 1 Fig. 1.1 shows a dead mouse lying on some grass in a field. Fig. 1.1 (a) The mouse is decaying. Name a type of organism that causes this decay. … [1] (b) The grass near the mouse grows taller than in the rest of the field. Suggest why this happens. … … … [1] (c) Explain why the grass underneath the mouse’s body cannot grow well. … … … [2]

3 0654/33/O/N/16 © UCLES 2016 [Turn over (d) A living mouse feeds on grass seeds. The mouse is eaten by an owl. (i) In the space, draw a food chain to show these relationships. [2] (ii) Explain why, in this food chain, there will be fewer owls than mice. … … … [2]

4 0654/33/O/N/16 © UCLES 2016 2 (a) Fig. 2.1 shows a pie chart of the composition of a sample of air. other gases oxygen nitrogen Fig. 2.1 (i) Name one gas present in the section labelled other gases for a sample of clean air. … [1] (ii) In a sample of air collected near a busy road, carbon monoxide is also present. Describe how this gas is produced by car engines. … … … … [3] (iii) Fig. 2.2 represents an incomplete diagram of the covalent bonding in a nitrogen molecule. N N Fig. 2.2 In Fig. 2.2 the shaded area shows where electrons are shared. State the number of shared electrons in this molecule. … [1]

5 0654/33/O/N/16 © UCLES 2016 [Turn over (b) Ozone molecules, O3, are made from oxygen molecules when electrical sparks pass through air. Fig. 2.3 shows a device that produces ozone. sparks air containing oxygen air containing some ozone Fig. 2.3 (i) Construct the balanced equation for the formation of ozone, O3, from oxygen in the air. … [2] (ii) Ozone can be used instead of chlorine in the treatment of water. Suggest how ozone makes water suitable for use in the home. … … [1]

6 0654/33/O/N/16 © UCLES 2016 3 (a) A train is travelling between two stations. Fig. 3.1 shows a speed / time graph for this journey. 40 30 20 10 0 0 20 40 60 80 100 120 140 160 speed m / s time / s Fig. 3.1 (i) Calculate the total distance travelled by the train. Show your working. distance = … m [1] (ii) State how you determined the total distance travelled by the train from information in Fig. 3.1. … … [1] (iii) Show that the acceleration of the train shown in Fig. 3.1 is 3.6 m / s2. [2]

7 0654/33/O/N/16 © UCLES 2016 [Turn over (b) The mass of the train is 7 × 104 kg. The acceleration of the train is 3.6 m / s2. (i) Calculate the accelerating force acting on the train. State the formula you use, show your working and give the unit. formula working force = … unit = … [3] (ii) Calculate the kinetic energy of the train when it is travelling at the maximum speed shown in Fig. 3.1. State the formula you use and show your working. formula working kinetic energy = … J [2]

8 0654/33/O/N/16 © UCLES 2016 (c) The train has an electric motor. A simple electric motor is shown in Fig. 3.2. X N W Z Y S coil brush split-ring commutator axle Fig. 3.2 The motor consists of a coil of wire mounted on an axle and placed in a magnetic field. The ends of the coil are connected to a battery by a split-ring commutator and two carbon brushes. (i) Describe and explain what happens to the coil WXYZ when an electric current passes through it. … … … … … … [3] (ii) Describe and explain the purpose of the split-ring commutator. … … … [2]

9 0654/33/O/N/16 © UCLES 2016 [Turn over 4 The small intestine has many villi on its internal surface. Fig. 4.1 shows the structure of a villus. … … … Fig. 4.1 (a) Complete the labels to identify the structures on Fig. 4.1. [3] (b) Describe the importance of the shape of the villi in the function of the digestive system. … … … [2] (c) A person develops a condition in which the villi of the small intestine become reduced in size. (i) Suggest how the person would be affected by this change in size of villi. … … [1] (ii) Suggest how the person should change their diet. … … [1]

10 0654/33/O/N/16 © UCLES 2016 5 (a) A student is asked to safely produce some hydrogen. Fig. 5.1 shows the apparatus and a choice of elements available. flask dilute sulfuric acid sodium magnesium sulfur Fig. 5.1 (i) The student correctly decides to add magnesium to the acid to produce hydrogen safely. Explain why the other two elements are unsuitable for this task. sodium … … sulfur … … [2] (ii) Predict how the pH of the mixture changes during the reaction between dilute sulfuric acid and magnesium. Explain your answer. pH … explanation … … … … [2]

11 0654/33/O/N/16 © UCLES 2016 [Turn over (b) The hydrogen produced is burnt in air. A cold metal plate is held above the burning hydrogen, as shown in Fig. 5.2. hydrogen water cold metal plate Fig. 5.2 (i) Water condenses on the metal plate. Describe a chemical test for water. Give the positive result. test … result … [2] (ii) The word equation for the combustion of hydrogen is shown. hydrogen + oxygen water ⎫ ⎪ ⎪ ⎪⎪ ⎪ ⎬ ⎪ ⎪⎪ ⎪ ⎪ ⎭ ⎫ ⎬ ⎭ reactants product Predict whether the product of the reaction contains a greater or smaller amount of chemical potential energy than the reactants. Explain your answer. … … … [2]

12 0654/33/O/N/16 © UCLES 2016 (c) When lithium combines with hydrogen, the ionic compound lithium hydride, LiH, is formed. (i) Fig. 5.3 shows the electron arrangements in a lithium atom and in a hydrogen atom. H Li X X X X lithium atom hydrogen atom Fig. 5.3 Draw diagrams to show the electron arrangements in a lithium ion and in a hydride ion. Include the ionic charges in your diagrams. [2]

13 0654/33/O/N/16 © UCLES 2016 [Turn over (ii) The balanced equation for the reaction is shown. 2Li + H2 2LiH The relative atomic mass of lithium is 7 and of hydrogen is 1. The volume of one mole of gas is 24 dm3. Use this information to calculate, the relative formula mass of lithium hydride, … the number of moles in 100 g of lithium hydride, … the number of moles of hydrogen molecules that are needed to produce 100 g of lithium hydride, … the volume of hydrogen used, in dm3. … dm3 [4]

14 0654/33/O/N/16 © UCLES 2016 6 (a) Electricity is generated in a nuclear power station by nuclear fission. Nuclear fission releases thermal energy which heats water. (i) Calculate the thermal energy needed to heat 5000 kg of water from 20 °C to 100 °C. The specific heat capacity of water is 4200 J / kg °C. State the formula you use and show your working. formula working energy = … J [3] (ii) Some of the thermal energy released in nuclear fission is used to turn water at 100 °C into steam at 100 °C. There is no change in temperature during this process. Describe why energy is needed to do this. … … … [1]

15 0654/33/O/N/16 © UCLES 2016 [Turn over (iii) Fig. 6.1 shows the arrangement of particles in a gas, liquid and solid. A B C Fig. 6.1 State and explain which diagram, A, B or C, best represents water at 100 °C, … explanation … … steam at 100 °C. … explanation … … [2] (b) Plutonium-239 (Pu-239) is produced by some nuclear power stations. Pu-239 is radioactive and has a half-life of 24 000 years. 1 kg of Pu-239 is sealed in a lead container. Calculate the mass of Pu-239 remaining after 96 000 years. Show your working. mass = … kg [2]

16 0654/33/O/N/16 © UCLES 2016 (c) The decay of some radioactive nuclides involves the release of α-particles and γ-rays. State the differences in the ways that α-particles and γ-rays behave in an electric field and in a magnetic field. Give reasons for your answers. electric field … … … magnetic field … … … [3]

17 0654/33/O/N/16 © UCLES 2016 [Turn over Please turn over for Question 7.

18 0654/33/O/N/16 © UCLES 2016 7 Fig. 7.1 shows some of the stages involved in brewing beer. barley seeds malted barley solution containing malt sugar unfiltered beer yeast end product stage 1 – germination stage 4 – sedimentation and filtration stage 2 – extraction with hot water ( ‘mashing’) stage 3 – process carried out with no air present Fig. 7.1 (a) During stage 1, the barley seeds produce an enzyme that breaks down stored starch into malt sugar. Name this enzyme. … [1] (b) At stage 3, yeast is added to the solution containing malt sugar. State two functions of the malt sugar in this mixture. 1 … 2 … [2]

19 0654/33/O/N/16 © UCLES 2016 [Turn over (c) (i) Name the process carried out by the yeast at stage 3. … [1] (ii) Write a word equation for the process that takes place in stage 3. … [1] (d) If air is bubbled through the mixture at stage 3, suggest and explain what would happen to the rate of growth of the yeast, … … … the rate of production of the beer. … … … [3]

20 0654/33/O/N/16 © UCLES 2016 8 (a) Fig. 8.1 shows the structure of a hydrocarbon molecule. H H H H H H H H C C C C Fig. 8.1 Name this compound and the homologous series to which it belongs. name … homologous series … [2] (b) Table 8.1 shows the names, boiling points and relative molecular masses of the first five members of a homologous series. Table 8.1 name boiling point / °C relative molecular mass methane − 162 16 ethane − 89 30 propane − 42 44 butane − 1 58 pentane + 36 (i) Describe and explain the trend shown in the boiling points in Table 8.1. … … … … [2] (ii) Use the data in Table 8.1 to predict the relative molecular mass of pentane. Explain your answer. relative molecular mass … explanation … … … [2]

21 0654/33/O/N/16 © UCLES 2016 [Turn over (c) When pure ethene gas is heated under pressure with a catalyst, a white solid is produced. (i) State the type of chemical reaction that occurs and name the white solid. type of reaction … name of white solid … [2] (ii) Complete the diagram below to show the structure of the white solid produced. H C [2]

22 0654/33/O/N/16 © UCLES 2016 9 (a) A car travels along a road. During the journey the temperature of the air in the tyres increases by 25 °C. The volume of air in the tyres remains the same. Explain in terms of particles why the pressure of the air in the tyres increases. … … … … [2] (b) Fig. 9.1 shows a circuit diagram for two lamps in a car. A 12 V battery is connected to the lamps. 12 V L1 L2 Fig. 9.1 Lamps L1 and L2 are identical and each have a resistance of 2.5 Ω when lit. Calculate the combined resistance of L1 and L2 when connected in parallel. Show your working. resistance = … Ω [2]

23 0654/33/O/N/16 © UCLES 2016 [Turn over (c) Relays are often used as switches in car circuits that use large currents. Explain why relays are used in this way. … … … [2] (d) Different metals can be used to make cables for electrical circuits in a car. A scientist investigates six different wires used in making these cables. He wants to determine the resistance of each piece of wire. Table 9.1 shows data the scientist collects. Table 9.1 wire metal composition length / cm cross-sectional area / mm2 A copper 10 0.5 B nichrome 10 0.5 C copper 20 0.5 D nichrome 20 0.5 E copper 10 1.0 F nichrome 20 1.0 (i) State which wire, A or E, has the lower resistance. Explain your answer. wire … explanation … … [1] (ii) Wire B has a greater resistance than wire A. State which wire, B, C, D, E or F, has the greatest resistance. Explain your answer. wire … explanation … … … [2]

24 0654/33/O/N/16 © UCLES 2016 10 Fig. 10.1 shows a fruit from a dandelion plant. The fruit is dispersed from the parent plant by the wind. X Y Fig. 10.1 (a) Suggest one way in which the structure of this dandelion fruit helps with wind dispersal. … … [1] (b) (i) Name the structure that is contained within the part of the fruit labelled X. … [1] (ii) The part labelled X has small spikes or spines on it. Suggest a function for these spikes. … … [1]

25 0654/33/O/N/16 © UCLES 2016 [Turn over (c) The part of the fruit labelled Y in Fig. 10.1 is called the beak of the fruit. A student thought that fruits with longer beaks would be carried further in the wind. The student does an experiment to investigate this. She measures the length of the beaks of 20 dandelion fruits. She releases each fruit in turn and measures the distance that the fruit travels before it lands. The graph in Fig. 10.2 shows her results. 50 40 30 20 10 0 5 10 15 20 25 distance travelled by the fruit before landing / m length of beak / mm Fig. 10.2 (i) State whether the results in Fig. 10.2 support the student’s idea that fruits with longer beaks travel further. Explain your answer. … … … [1] (ii) Suggest one other feature of the fruit that might affect how far the fruit is carried by the wind. … [1]

26 0654/33/O/N/16 © UCLES 2016 (d) Give one reason why it is helpful to the dandelion species if the fruits are carried a long distance from the parent plant. … … [1] (e) (i) Wind is one method of fruit dispersal. State one other method of fruit dispersal. … [1] (ii) For the method you have chosen in (e)(i), state how the structure of a fruit or seed may help it to be dispersed in this way. … … … [1]

27 0654/33/O/N/16 © UCLES 2016 [Turn over 11 (a) Copper is a transition metal. Some properties, A to E, of metallic elements are listed. A form some coloured compounds B good conductors of electricity C good conductors of thermal energy D malleable E used as catalysts State the letters which describe copper, but do not describe Group I metals. … [1]

28 0654/33/O/N/16 © UCLES 2016 (b) Fig. 11.1 shows a method of obtaining a sample of copper from copper oxide. stirring rod warm dilute acid copper oxide step 1 step 2 step 3 step 1 reaction mixture excess copper oxide copper sulfate solution copper sulfate solution excess zinc Fig. 11.1 (i) Complete the word equation for the reaction in step 1. … acid … copper oxide copper sulfate + + [2]

29 0654/33/O/N/16 © UCLES 2016 [Turn over (ii) Copper ions are reduced by zinc atoms in step 3 of Fig. 11.1. State why zinc atoms are able to reduce copper ions. … [1] (iii) Explain why the change to the copper ions in step 3 is described as reduction. … … [1] (c) Fig. 11.2 shows laboratory apparatus used in the electrolysis of copper sulfate solution. − + d.c. power supply copper electrode Y copper electrode X copper sulfate solution Fig. 11.2 (i) Name electrodes X and Y. X … Y … [1] (ii) Explain, in terms of the electrode reaction, the change in mass of the negative copper electrode. … … … … [2]

30 0654/33/O/N/16 © UCLES 2016 12 Nuclear fusion is the main process that releases energy in the Sun. In nuclear fusion, hydrogen nuclei collide and produce heavier, helium nuclei, releasing energy. (a) In the Sun, four hydrogen nuclei collide to form one helium nucleus. For every helium nucleus formed, 4.2 × 10−12 J of energy are released. The Sun releases approximately 3.8 × 1026 J every second. Estimate the number of helium nuclei formed in the Sun every second. Show your working. number of helium nuclei = … [2] (b) Describe the difference between nuclear fusion and nuclear fission. … … [1] (c) Most of the radiation from the Sun that reaches the Earth is in the visible light, infra-red and ultraviolet parts of the electromagnetic spectrum. (i) Place ultraviolet and infra-red in their correct positions in the incomplete electromagnetic spectrum shown in Fig. 12.1. γ-rays visible light microwaves [1] Fig. 12.1 (ii) State the part of the electromagnetic spectrum shown in Fig. 12.1 that has the highest frequency. … [1] (d) The nuclear reactions that take place in the Sun produce sound energy. Explain why we cannot hear this sound on Earth. … … [1]

31 0654/33/O/N/16 © UCLES 2016 13 (a) Write the balanced symbol equation for photosynthesis. … [2] (b) Fig. 13.1 shows the cross-section of a leaf as it appears using a microscope. P Q R Fig. 13.1 (i) Name the parts of the leaf labelled P, Q and R. P … Q … R … [3] (ii) On Fig. 13.1, draw an arrow to show the route taken by carbon dioxide as it enters the leaf. [1] (c) The leaf absorbs light energy. (i) Name the cells in the leaf that absorb the most light energy. Explain why these cells are able to absorb so much light. name of cells … explanation … … [2] (ii) State what happens to the light energy absorbed by these cells. … … [1]

32 0654/33/O/N/16 © UCLES 2016 Group The Periodic Table of Elements 1 H hydrogen 1 2 He helium 4 I II III IV V VI VII VIII 3 Li lithium 7 4 Be beryllium 9 atomic number atomic symbol Key name relative atomic mass 11 Na sodium 23 12 Mg magnesium 24 19 K potassium 39 20 Ca calcium 40 37 Rb rubidium 85 38 Sr strontium 88 55 Cs caesium 133 56 Ba barium 137 87 Fr francium – 88 Ra radium – 5 B boron 11 13 Al aluminium 27 31 Ga gallium 70 49 In indium 115 81 Tl thallium 204 6 C carbon 12 14 Si silicon 28 32 Ge germanium 73 50 Sn tin 119 82 Pb lead 207 22 Ti titanium 48 40 Zr zirconium 91 72 Hf hafnium 178 104 Rf rutherfordium – 23 V vanadium 51 41 Nb niobium 93 73 Ta tantalum 181 105 Db dubnium – 24 Cr chromium 52 42 Mo molybdenum 96 74 W tungsten 184 106 Sg seaborgium – 25 Mn manganese 55 43 Tc technetium – 75 Re rhenium 186 107 Bh bohrium – 26 Fe iron 56 44 Ru ruthenium 101 76 Os osmium 190 108 Hs hassium – 27 Co cobalt 59 45 Rh rhodium 103 77 Ir iridium 192 109 Mt meitnerium – 28 Ni nickel 59 46 Pd palladium 106 78 Pt platinum 195 110 Ds darmstadtium – 29 Cu copper 64 47 Ag silver 108 79 Au gold 197 111 Rg roentgenium – 30 Zn zinc 65 48 Cd cadmium 112 80 Hg mercury 201 112 Cn copernicium – 114 Fl flerovium – 116 Lv livermorium – 7 N nitrogen 14 15 P phosphorus 31 33 As arsenic 75 51 Sb antimony 122 83 Bi bismuth 209 8 O oxygen 16 16 S sulfur 32 34 Se selenium 79 52 Te tellurium 128 84 Po polonium – 9 F fluorine 19 17 Cl chlorine 35.5 35 Br bromine 80 53 I iodine 127 85 At astatine – 10 Ne neon 20 18 Ar argon 40 36 Kr krypton 84 54 Xe xenon 131 86 Rn radon – 21 Sc scandium 45 39 Y yttrium 89 57–71 lanthanoids 89–103 actinoids 57 La lanthanum 139 89 Ac lanthanoids actinoids The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.) actinium – 58 Ce cerium 140 90 Th thorium 232 59 Pr praseodymium 141 91 Pa protactinium 231 60 Nd neodymium 144 92 U uranium 238 61 Pm promethium – 93 Np neptunium – 62 Sm samarium 150 94 Pu plutonium – 63 Eu europium 152 95 Am americium – 64 Gd gadolinium 157 96 Cm curium – 65 Tb terbium 159 97 Bk berkelium – 66 Dy dysprosium 163 98 Cf californium – 67 Ho holmium 165 99 Es einsteinium – 68 Er erbium 167 100 Fm fermium – 69 Tm thulium 169 101 Md mendelevium – 70 Yb ytterbium 173 102 No nobelium – 71 Lu lutetium 175 103 Lr lawrencium – 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.

® IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 10 printed pages. © UCLES 2016 [Turn over Cambridge International Examinations Cambridge International General Certificate of Secondary Education CO-ORDINATED SCIENCES 0654/33 Paper 3 Extended Theory October/November 2016 MARK SCHEME Maximum Mark: 120 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 33 © UCLES 2016 Question Answer Marks 1(a) decomposer ; 1 1(b) decay releases (named) nutrients ; 1 1(c) no light ; prevents photosynthesis ; 2 1(d)(i) grass / seeds → mouse → owl correct organisms in order ; arrows orientated correctly ; 2 1(d)(ii) energy losses at each stage ; due to respiration / heat / excretion / not all eaten ; less energy available to the owls ; max 2 Total: 8 Question Answer Marks 2(a)(i) any noble gas / carbon dioxide / water vapour ; [allow other trace gases] 1 2(a)(ii) idea of incomplete combustion ; of fuel / named fuel ; which is a hydrocarbon ; 3 2(a)(iii) 6 / three pairs ; 1 2(b)(i) 3O2 → 2O3 formula of oxygen ; balanced ; 2

Page 3 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 2(b)(ii) sterilisation / kills (harmful) microorganisms/bacteria ; 1 Total: 8 Question Answer Marks 3(a)(i) (½ × 10 × 36 + 120 × 36 + ½ × 20 × 36) = 4860 (m) ; 1 3(a)(ii) area under graph ; 1 3(a)(iii) correct values shown from graph ; =36 / 10 (= 3.6 m / s2) ; 2 3(b)(i) (force =) mass × acceleration / ma / 7 × 104 × 3.6 ; 2.52 × 105 ; N ; 3 3(b)(ii) (KE =) ½ mv2 / ½ × 7 × 104 × 36 × 36 ; 4.5 × 107 (J) ; 2 3(c)(i) (coil) spins / turns ; (current produces) magnetic field around coil / conductor / wire ; magnetic fields interact ; force on, coil / conductor / wire, carrying current in opposite directions ; force on opposite sides in opposite directions ; max 3 3(c)(ii) reverses current (every half turn) ; keeps the coil spinning (in the same direction) ; 2 Total: 14

Page 4 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 4(a) capillary ; lacteal ; epithelium ; 3 4(b) increased surface area ; for absorption ; 2 4(c)(i) nutrients absorbed less (efficiently) / loss of weight / AVP ; 1 4(c)(ii) eat small amounts frequently / eat easily digested or absorbed foods / eat nutrient-dense foods ; 1 Total: 7 Question Answer Marks 5(a)(i) sodium may explode / too reactive (to be safe) ; sulfur does not react ; 2 5(a)(ii) increases ; acid concentration decreases / acid is used up / solution becomes less acidic ; 2 5(b)(i) cobalt chloride paper ; changes (from blue) to pink ; OR anhydrous copper sulfate ; changes (from white) to blue ; 2 5(b)(ii) (smaller) burning of hydrogen is exothermic ; chemical potential energy transferred from reactants as thermal energy (to surroundings) ; max 2

Page 5 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 5(c)(i) correct electron configurations ; correct charges ; 2 5(c)(ii) (Mr LiH =) 8 ; moles of LiH = 100 ÷ 8 = 12.5 ; moles of hydrogen = 12.5 ÷ 2 = 6.25 ; calculate volume of hydrogen = 6.25 × 24 = 150 (dm3) ; 4 Total: 14 Question Answer Marks 6(a)(i) temperature change = 80 °C ; (energy =) mass × SHC × change in temperature / (mC∆T / 5000 × 4200 × 80 ; 1.68 × 109 (J) ; 3 6(a)(ii) latent heat (of vaporisation) / energy required to separate molecules from each other ; 1 6(a)(iii) (water is) B most particles are touching and random arrangement ; (steam is) C particles are spread out (and random arrangement) ; 2 6(b) 4 half-lives / 1 / 16 remains ; 0.0625 kg ; 2

Page 6 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 6(c) electric field – alpha deflected gamma not ; magnetic field – alpha deflected gamma not ; alpha is charged / gamma is not charged / is a wave ; 3 Total: 11 Question Mark Scheme Details Marks 7(a) amylase ; 1 7(b) energy source ; can be converted to alcohol ; provides sweetness / flavour ; max 2 7(c)(i) anaerobic respiration ; 1 7(c)(ii) glucose → alcohol + carbon dioxide ; 1 7(d) (rate of yeast growth increases) increased respiration ; ref to oxygen / aerobic respiration ; (aerobic respiration releases) more energy (for growth) ; rate of beer / alcohol production increases because more yeast ; AVP ; max 3 Total: 8

Page 7 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 8(a) butene ; alkenes ; 2 8(b)(i) as Mr increases the boiling point increases ; heavier / larger molecules: have greater intermolecular (attractive) forces / require a larger amount of (thermal / heat) energy to separate molecules ; 2 8(b)(ii) 72 ; each member is 14 units greater than the previous so 58 + 14 = 72 ; 2 8(c)(i) (addition) polymerisation ; poly(ethene) ; 2 8(c)(ii) at least two carbon atoms with correct number of hydrogen atoms and only single bonds ; clear indication of continuation ; 2 Total: 10 Question Answer Marks 9(a) kinetic energy of particles increases / particles move faster ; more frequent collisions with tyre / hit tyre, with more force / harder ; 2 9(b) use of 1 / RT = 1 / R1 + 1 / R2 OR statement that combined resistance of 2 equal resistances in parallel is half one of the resistances ; RT = 2.5 / 2 = 1.25 (Ω) ; 2 9(c) relay uses a low current to switch on a high current ; safety / protection of low current, circuits / switches / cables ; 2 9(d)(i) (E no mark) CSA of E is greater ; 1

Page 8 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 9(d)(ii) (D no mark) nichrome (has greatest resistance for same length and CSA) ; greater length and least CSA ; 2 Total: 9 Question Answer Marks 10(a) light ; high surface area (to volume ratio) ; max 1 10(b)(i) seed ; 1 10(b)(ii) anchorage / holds the seed still (for germination) / AW ; 1 10(c)(i) no, because not correlated / owtte ; 1 10(c)(ii) mass / weight / size ; 1 10(d) colonises new areas / reduces competition (within the species) / AVP ; 1 10(e)(i) animals ; AVP ; max 1 10(e)(ii) matching adaptation ; 1 Total: 8

Question 11(a) 11(b)(i) 11(b)(ii) 11(b)(iii) 11(c)(i) 11(c)(ii) Question 12(a) 12(b) 12(c)(i) 12(c)(ii) Page 9 A and E ; sulfuric (acid) ; water ; zinc is more rea (copper ions) ga X cathode and Y (mass of negati copper ions are copper ions, ga copper atoms a 3.8 × 1026/4.2 × = 9 × 1037 ; fission – nuclei gamma ; Camb active (than copp ain electrons ; Y anode ; ve electrode inc e attracted / move ain electrons / are are formed at the 10-12 ; split (but fusion Mark bridge IGCSE – per) / zinc atoms creases – no ma e to the cathode e discharged, at e cathode ; nuclei join) ; k Scheme October/Novem © UCLES 2016 Answer s form ions more ark) e ; the cathode ; Answer mber 2016 e easily (than cop Syllabus 0654 pper) / zinc displa s Paper 33 aces copper ; To Marks 1 2 1 1 1 max 2 otal: 8 Marks 2 1 ; 1 1

Page 10 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0654 33 © UCLES 2016 Question Answer Marks 12(d) sound needs a medium / particles to travel through/sound does not travel through a vacuum ; 1 Total: 6 Question Answer Marks 13(a) 6CO2 + 6H2O → C6H12O6 + 6O2 correct formulae of reactants and products ; balanced equation ; 2 13(b)(i) P = cuticle ; Q = palisade/mesophyll ; R = xylem ; 3 13(b)(ii) arrow coming in through the lower epidermis/stoma ; 1 13(c)(i) palisade cells ; many chloroplasts / cells near the top of the leaf ; 2 13(c)(ii) converted to chemical energy ; 1 Total: 9