‘Centre Number ‘Candidate Number] Name MINISTRY OF EDUCATION, BOTSWANA in collaboration with UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE Botswana General Certificate of Secondary Education SCIENCE : DOUBLE AWARD 0569/03 Paper 3 October/November 2003 2 hours Candidates answer on the Question Paper No additional materials are required Read the following carefully before you start. ‘Write your centre number, candidate number and name in the spaces provided at the top of this page. ‘Answer all questions. ‘Write your answers in the spaces provided on the question paper. Do not use staples, paper clips, highlighters, glue or correction fluid. ‘The number of marks is given in brackets [ ] at the end of each question or [ For Examiner's Use part question, You may use a calculator. 1 ‘A copy of the Periodic Table is printed on page 16. 2 3 4 8 6 7 8 9 10 1 12 13 TOTAL ‘This question paper consists of 15 printed pages and 1 blank page. ‘SP suF2960TC 84525015 Oucles 2003 [Turn over|1 2 ‘A Girl pours hot water into a bottle and a Thermos flask, Fig. 1.1. She notices that the bottle gets hotter than the flask. Fig. 1.1 (a) By what process does heat from the water in the bottle reach her hand? {1] (b) State two features of the Thermos flask that reduce heat loss from the flask, and ‘explain how each reduces heat loss. 4) i es3a 2 An electric motor rated at 200W is used to raise a 20kg bag to the roof of a building 10m high. (a) What form of energy does the bag gain as it rises? (b) Calculate the work done to raise the bag to the roof. (1 kg has a weight of 10). work done = . (2) (©) Assuming no energy losses, how long wil it take for the bag to reach the roof? time =. 2) csaavannen [Turn over3 4 (a) Fig. 3.1 shows the positions of air particles when two sound waves, A and B pass through the air in the same time interval. Fig. 3.1 (i) What type of wave is a sound wave? (il) Which sound wave has a higher pitch? Explain your answer. (il) One wave is reflected by a vertical wall. What effect wil this have on its pitch? Explain your answer. (5) (b) A student stands 400 m away from a vertical wall. She fires a starter pistol and hears an echo after 2.48, Calculate the speed of sound in ait. speed =... - 2) Far ‘anos4 (c) A magnifying glass produces a virtual enlarged image. convex lens ‘Complete the diagram to show; (i) where the object should be placed. Label the object O. (il) how the image is formed. Fig. 4.1 shows two skydivers A and B falling in air. Fig. 4.1 (@) Name the two vertical forces acting on each diver. 1 2 (b) Explain why diver B would fall faster than diver A. ro) (4) [Turn over FerFig. 5.1 shows two resistors in parallel. These resistors can be replaced by a single resistor X, without changing the brightness of the lamp. 45V it aa 2a Fig. 5.1 (a) What would be the resistance of resistor X? resistance = . (2) (b) What would be the effect on the brightness of the lamp of removing the 8 resistor? Explain your answer. (2) (©) (State one difference between a step-down and a step-up transformer. i) A transformer connected to a 240 supply draws a current of 10. The voltage output of the transformer is 600 V. Calculate the current in the secondary coil, current = sescceeenneeeesee 2] Gi) Why is it preferable to use low current in the transmission of electricity over long distances? Fw lexan6 z 7 Fig. 6.1 shows the arrangement of particles in structures X and Y. Cee Ty nucleus x Y Fig. 6.1 (@) (i) Write the chemical formula of a compound with structure X. (li) Write the chemical formula of the compound with structure Y. (2) (b) Complete the table by naming the type of structure and bonding in X and ¥. type of structure bonding — (4) (©) Why does the compound with structure X have a high melting point, while that with structure ¥ has a low melting point? x (2) (@) Give one other property each for compounds with the bonding in X and in Y. x (2) ceaoanes [Turn over lesamrers7 The equation represents the complete combustion of 2.0g of propane at room temperature and pressure. CHe(g)+ 0,(9)-> CO,(9)+ H,O(!) (a) Balance the equation. oy (b) Calculate the number of moles of propane that were burnt. umber of moles - 2) (6) Calculate the mass of oxygen that reacted with propane. mass of O, =. (d) Calculate the volume of carbon dioxide produced. ave dm? [2] volume of CO, = (e) When the carbon dioxide produced was dissolved in water, it formed a weak acid. () Whats a weak acid? Name the weak acid formed.9 8 The world-wide chemical industry has some advantages and disadvantages if it is not undertaken properly. (@) State two environmental problems that may be caused by the chemical industry. 1 2 (2) {b) Some products of the chemical industry are recycled. (i) What is recycling? (il) Give two advantages of recycling. 1 2 (ili) Name one substance that can be recycled. [1] 9 Dudu prepared some alcohol by mixing yeast, malt, sugar and warm water. The mixture was left for 2-3 days. (a) Name the substance added to speed up the reaction. (b) Name the process used to prepare the alcohol. [1] (©) Write an equation to represent the reaction that took place. Fer lenis eansanes [Turn over10 (d) The equation shows the reaction between the alcohol and ethanoic acid to form P and water, CH,COOH + C,H,OH —— P +H,0 (Name the group of organic compounds to which P belongs. “ (1) (ii) Draw the molecular formula of P. io) i) State one physical property of P. Equations S and R represent the preparation of ethanol, C,H,OH, from butane. s CHjCH,CH,CHs ——» M + CHsCHs R| hydrolyse with steam (CoHgOH (i) Write the chemical formula of M. (ii) Name the type of reaction S, (il) Name the homologous series to which CH,CH, belongs. OF lexan" 10 Blood vessels supply cells with energy sources and substances for growth, and act as removal system for wastes. (a) (i) Describe how energy is obtained by cells. (ii) With reference to named substances, explain how blood promotes growth in the tissues. excreted. li) Complete the table below to show where any two named waste products are waste product organ (b) Some young women develop a condition in which there are fewer red blood cells than normal. (i) What physical effect does this have on them? (ii) Suggest the cause of this condition ah (2) (2) (4) [Turn over12 11. Fig. 11.1 shows blood vessels in the skin. ge mae capillary \YsS Yi blood flow —» ——_ << -—_, Fig. 11.1 When a person carries out vigorous exercise, there is a change in the capillary in the skin. (@) (On Fig. 11.1, show how the capillary would change if vigorous exercise is carried out. 1 (ii) Explain now the change you have shown helps in regulating body temperature. (b) Describe the role of the following skin structures in cooling the body. (hair: {2} (i) sweat glands... i) receptors. (213 12 A student used three culture solutions A, B and C to investigate the necessity of mineral salts for plant growth. Three leafy shoots were put in the culture solutions treated as follows: A solution with all mineral salts B solution lacking nitrate ions © solution lacking magnesium ions The leafy shoots were exposed to the same conditions of growth for four weeks. Air was bubbled through the solutions. (2) Which plant will show the healthiest growth? (b) Describe and explain the appearance of (@ plantB ‘appearance: explanation: (2) (ii) plant appearance: explanation: .. (2) (©) Why was it necessary to bubble air through the solutions during the experiment? (d)_ What was the purpose of plant A? (@) (i) Name the process by which the plants take up mineral salts. (li) State two ways in which the process in (i) differs from osmosis. 12 lemmas semen [Turn over14 13 Fig. 13. 1 shows the percentage of undigested food taken in through the mouth until it leaves the alimentary canal. 100 percentage of undigested 50. food) oF ¥ t t A B c D E FoG section of alimentary canal anus Fig. 13.1 (a) Name section B. [1 (b) Why does the digestion of carbohydrates stop in section C? a (1 (c)_Inwhich section does most digestion occur? (d)_ State the function of section F. ft] (e) State what happens to the undigested material at G. Fer15 BLANK PAGE) ) (013) einssaid pue einyesedwey Woo! 1 _lUP ¥Z S| Se6 Ku Jo BIOw! 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