The number of marks is given in brackets [ ] at the end of each question or part question.

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1 EXAMINATIONS COUNCIL OF SWAZILAND in collaboration with UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE Swaziland General Certificate of Secondary Education * * COMBINED SCIENCE 6886/03 Paper 3 (Extended) October/November 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. Answer all questions. Write your answers in the spaces provided on the question paper. A copy of the Periodic Table is printed on page 16. You may use a calculator. The number of marks is given in brackets [ ] at the end of each question or part question Total This document consists of 15 printed pages and 1 blank page. DC (NF/JG) 37418/3 [Turn over

2 1 Fig. 1.1 shows cells taken from two organisms. 2 cell A cell B Fig. 1.1 (a) State two visible structural differences between the two cells. A B 1 2 [2] (b) Describe how cell A is adapted for its function.... (c) (i) State the function of cell B. (ii) Name the substance found in cell B that enables it to carry out its function.

3 2 Ethanol burns in air according to the following equation: 3 C 2 H 5 OH + 3O 2 2CO 2 + 3H 2 O (a) (i) Name the chemical process shown above. (ii) Calculate the relative molecular mass, M r, of ethanol.... [1] (iii) Calculate the mass of carbon dioxide produced when 23 g of ethanol burns.... [3] (b) (i) Fermentation is one process by which ethanol may be formed. Describe another of these processes.... (ii) Fermentation slows down when the temperature is increased above 30 C. Explain why it slows down.... [Turn over

4 3 Fig. 3.1 shows a ray of light entering a rectangular glass block. 4 glass block Fig. 3.1 (a) Complete the path of the ray as it goes through the glass block. [2] (b) The angle of incidence of the ray is 45 and the angle of refraction is 28. Calculate the refractive index of the glass block.

5 4 (a) Fig. 4.1 is a simplified diagram of a structure found in the lung. 5 blood from pulmonary artery C blood to pulmonary vein blood capillary (i) Name the structure labelled C. Fig. 4.1 (ii) Describe how oxygen is absorbed into the blood capillary (b) (i) What is meant by the term homeostasis? (ii) Humans have a constant body temperature. Describe how sweating lowers the body temperature [Turn over

6 5 The electron arrangement of ions X 3+ and Y 2 are 2.8 and respectively. 6 (a) (i) State the electronic arrangement in the neutral atom X. (ii) Write the formula for the compound formed when X and Y react. (b) Draw a diagram to show the arrangement of electrons in the outermost shells when the neutral atom Y reacts with a carbon atom. [3]

7 6 Fig. 6.1 shows a speed-time graph for a motorbike over 16 seconds. 7 speed m / s Fig. 6.1 (a) Calculate the acceleration of the motorbike. time / s (b) The motorbike and rider have a total mass of 200 kg. Calculate the resultant force on the motorbike producing this acceleration. (c) Calculate the distance covered by the motorbike in 16 seconds. [Turn over

8 7 Fig. 7.1 shows an enlarged diagram of an area of the skin that has been damaged and a blood capillary that has been cut open. The diagram is not to scale. 8 pathogen skin surface fibrin E D blood capillary Fig. 7.1 (a) (i) Name the cells labelled D and E. D... [1] E... [1] (ii) State the process that is being carried out by cell D. (b) Young children are regularly given vaccines. Explain how vaccination leads to immunity.... [3]

9 8 Fig. 8.1 shows a flow diagram representing some reactions of substances H, I, J, K and L. 9 black solid H aqueous solution I, turns universal indicator red. barium nitrate white precipitate J mix H and I blue solution K add dilute sodium hydroxide blue precipitate L Fig. 8.1 (a) Identify aqueous solution I. Explain how you used the information in Fig. 8.1 to make this identification.... (b) the information about substances H, K and L to suggest the identity of substances H and K. Explain your answer.... [3] [Turn over

10 9 A man lifts a bag of mass 30 kg from the floor and places it on a shelf that is 1.3 m above the floor in 3 seconds. g = 10 N / Kg. 10 (a) Calculate the weight of the bag. (b) Calculate the work done on the bag. (c) Calculate the rate at which work is done on the bag.

11 10 Fig shows the internal structure of a leaf. 11 Fig (a) On Fig label (i) F, a cell where photosynthesis is highest, [1] (ii) G, the part that brings water to the leaf. [1] (b) (i) Plants absorb mineral ions from the soil. One of the mineral ions is magnesium. State the function of magnesium ions in plants. (ii) Describe one danger of the overuse of nitrogen-containing fertilisers [3] (c) Explain how water uptake is made possible by transpiration.... [Turn over

12 11 Fig shows part of the Periodic Table. Some elements are represented by letters. The letters are not the chemical symbols of the elements. 12 D A C B E Fig only the letters shown in Fig to answer these questions. Each letter may be used once, more than once or not at all. Choose an element that (a) is a halogen that is a liquid at room temperature,... (b) is a transition element,... (c) is the most reactive element in Group VII,... (d) forms an amphoteric oxide....

13 13 12 Fig shows the information plate on a hairdryer. 800 W 240 V 50 Hz Fig (a) What is the power of the hairdryer?... [1] (b) Calculate the normal operating current of the hairdryer. (c) Three fuses 3 A, 5 A and 15 A are provided. Which fuse would be suitable for this hairdryer?... (d) Explain the use of the fuse in the hairdryer.... (e) Calculate the energy converted by the hairdryer in 20 minutes. [Turn over

14 13 Cracking is a process of breaking long chain alkanes into shorter chain alkanes and alkenes. 14 (a) Complete the following equation for a cracking reaction: C 10 H 22 C 2 H [1] (b) State the chemical test for the identification of C 2 H (c) Name a polymer that is formed when several C 2 H 4 molecules combine.... (d) Draw the structure of the polymer in (c) above showing three monomer units. [2] 14 A clinical thermometer is sensitive and has a short range. (a) State the feature that makes the thermometer more sensitive.... (b) What is the significance of the short range in a clinical thermometer?... (c) Name a feature of a clinical thermometer, other than the short range, that is not found in the laboratory thermometer....

15 15 BLANK PAGE 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 (ECOS) 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.

16 16 DATA SHEET The Periodic Table of the Elements Group I II III IV V VI VII H Hydrogen 2 4 He Helium 3 7 Li Lithium 4 9 Be Beryllium 5 11 B Boron 6 12 C Carbon 7 14 N Nitrogen 8 16 O Oxygen 9 19 F Fluorine Ne Neon Na Sodium Mg Magnesium Al Aluminium Si Silicon P Phosphorus S Sulfur Cl Chlorine Ar Argon K Potassium Ca Calcium Sc Scandium Ti Titanium V Vanadium Cr Chromium Mn Manganese Fe Iron Co Cobalt Ni Nickel Cu Copper Zn Zinc Ga Gallium Ge Germanium As Arsenic Se Selenium Br Bromine Kr Krypton Rb Rubidium Sr Strontium Y Yttrium Zr Zirconium Nb Niobium 96 Mo Molybdenum Tc Technetium Ru Ruthenium Rh Rhodium Pd Palladium Ag Silver Cd Cadmium In Indium Sn Tin Sb Antimony Te Tellurium I Iodine Xe Xenon Cs Caesium Ba Barium 139 La Lanthanum 57 * Hf Hafnium Ta Tantalum W Tungsten Re Rhenium Os Osmium Ir Iridium Pt Platinum Au Gold Hg Mercury Tl Thallium Pb Lead Bi Bismuth 84 Po Polonium 85 At Astatine 86 Rn Radon Fr Francium Ra Radium 227 Ac Actinium 89 * Lanthanoid series Actinoid series Key b a X a = relative atomic mass X = atomic symbol b = atomic (proton) number Ce Cerium 232 Th Thorium 141 Pr Praseodymium Pa Protactinium Nd Neodymium 238 U Uranium Pm Promethium Sm Samarium Eu Europium Gd Gadolinium Tb Terbium Dy Dysprosium Np Neptunium 94 Pu Plutonium 95 Am Americium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium Ho Holmium Es Einsteinium Er Erbium Fm Fermium Tm Thulium Md Mendelevium Yb Ytterbium No Nobelium Lu Lutetium Lr Lawrencium 103 The volume of one mole of any gas is 24dm 3 at room temperature and pressure (r.t.p.).

This resource contains three different versions of the periodic table, including a blank one for colouring!

Teaching notes This resource contains three different versions of the periodic table, including a blank one for colouring! It also contains tables of the Group 0, 1 and 7 elements with a few columns for