Centre Nomber 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 2004 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. For Examiner's Use Write your answers in the spaces provided on the question paper. 7 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 | 2 part question, You may use a calculator. 3 A copy of the Periodic Table is printed on page 20. 4 5 6 7 8 9 10 " 12 13 4 15 TOTAL This question paper consists of 19 printed pages and 1 blank page. ‘SP (SKS) Ss204er3 Jevec 2008 [Turn overfw 2 lense te 1 (a) Fig. 1.1 shows the speed-time graph of a ball thrown vertically upwards. (g = 10 m/s?) speed 9° mis 20 10 ° -10 -20 -30 14 LC (1) What is the speed of the ball at the highest point? | speed t) Calculate the maximum height reached. height | i) How long does the ball take to reach the highest point? | | wnt] (lil) What is the energy transfer taking place as the ball falls from the maximum height back to the thrower? from to [1] (b) Abox is pushed by a force of 100N along a surface al a constant speed of 0.5mis in 3 | seconds. | (Whats the friction force? Calculate the work done in moving the box along the surface. work done 8 (© BEC 2004 56070310108fs 3 [Examiners 2 Fig. 2.1 shows a glass beaker containing water at 2°C. __-glass beaker | water droplets | water Fig. 2.1 iter some time droplets of water are formed on the outer wall of the glass beaker, Explain how the water droplets are formed on the outer wall. of] (© BEC 2004 oscauaonos {Turn over4 3 Fig. 3.1 shows a converging lens used as a magnifying lens. 4 image object Fig. 3.1 (2) Complete the path of the ray after passing through the lens and find the principal focus. Label it f (b) What is the focal length of the lens? (c) Fig. 3.2 shows a prism as used in a projector to make the image upright. (The diagram is not to scale). Inverted Fig. 3.2 © BEC 2004 o569100.No8 converging lens fo examiners eeon 5 |Examiners (i) Complete the path of the rays to show how the image becomes upright on the screen, (li) Name the effect that the rays undergo along the side ZY. [3] 4 Fig. 4.1 shows a practical application of echo sounding in mineral prospecting. (The average speed of sound in rocks = 4500 mis.) receiver transmitter Fig. 4.1 (a) A transmitter sends out shock waves and the receiver detects an echo from the coal deposit 2 later. How deep is the coal deposit in km? depth = (3) (b) The transmitter sends out a signal, but the receiver detects several signals in succession. ‘Suggest why the receiver picks up more than one signal. [2] © EC 2004 osea1}0.Nos [Turn over5 _ Fig. 5.1 shows two houses which have lightning conductors. In house A, the rod is attached to the roof while in house B the rod is attached to a metal plate buried underground, Fig. 5.1 (a) Name a suitable metal which could be used to make the rod. (b) Explain why house A is more likely to be damaged by lightning. elt} (c)_Ina storm, the spikes have a positive charge as shown. Indicate on the diagram the sign and location of the charge on the cloud above the spikes. i © 8EC 2004 0568103101086 Fig. 6.1 shows an electric circuit. The 3a reading of A, = 1.54, (a) State the current through Cc @ Ry. R. 12V (b) Calculate the voltage across each resistor. © BEC 2004 (i) Voltage across R, Voltage across Ri, Voltage across Rhy Rp Oo Ry Oe Fig. 6.1 Fer leamnars 2) - (2) [Turn over8 Felt 7 To improve crop yields, farmers add fertilisers like ammonium nitrate to their fields. (@) (i) Write the chemical formula of ammonium nitrate. Calculate the percentage by mass of nitrogen in ammonium nitrate. =1). (N= 14,016, (b) Lime, calcium oxide, (CaO), is sometimes added to neutralise acidic soils. (Write an equation for the reaction between lime and dilute hydrochloric acid, HCI. 2) (ii) Write the ionic equation for the reaction in (bi. j l2 (ii) Explain why ammonium nitrate is regarded as a good fertiliser for plants, while lime. is not. (c)_ Lime is obtained from the thermal decomposition of limestone, CaCO,. ‘The equation shows the decomposition of 5 g of limestone. CaCO,(s) —> CO,(g) + Ca0(s) (i) What is meant by thermal decomposition? (ii) State one use of calcium carbonate other than the production of lime. 1 | (iii) Calculate the number of motes of calcium carbonate decomposed. ‘number of moles = . vo 2) | (iv) How many moles of calcium oxide would be produced? moles = ~[t] (¥) Calculate the volume of carbon dioxide produced at room temperature and pressure. (1 mole of a gas occupies 24 dm® at room temperature and pressure). ‘volum (2) © BEC 2004 05600901N04exw 8 Study the flow chart shown. “ ‘glucose [iereraton ethanol] + gas Q } dehydration polymerisation ethene hydrogen + catalyst Y promi R bromoethane s (@) (i) What must be added to glucose to enable fermentation to take place? (ii) State two conditions necessary for fermentation to occur. (b) Write the names of substances R, S and gas @ C,H,OH + CH{COOH —> CH,COOCH,CH, +H,0 (i) Name the organic product for this reaction, 3) (C)_ The equation shows the reaction between ethanol and ethanoic acid (i) Draw the structural formula of the organic product of the reaction, | 11) (© BEC 2004 osca0210m04 [Turn over10 9 The diagram shows the position of iron, Fe, in the Periodic Table. Fe! (a) Name the group of metals to which iron belongs. (1) (b) State two properties of metals in the group named in (a) above. 1. 2 (2) (6) Iron is used in the manufacture of ammonia, NHy. (Draw a dot and cross diagram to show the bonding in a molecule of ammonia, [2] (li) What type of bonding is present in a molecule of ammonia? (a) Ammonia dissolves in water to form a weak alkali, aqueous ammonia, (i) Why is aqueous ammonia a weak alkali? © BEC 2004 569/03107N04 for examines ee" exanars (ii) Suggest the pH of aqueous ammonia. ad [1] (il) Describe how aqueous ammonia is used to test for the presence of aluminium ions ina solution. | AQ] © BEC 2004 sea1g101No8 [Turn over12 10 To demonstrate uptake of water in plants Mpho sucked water from a glass using a straw as, shown in Fig. 10.1. Fig. 10.1 (a) Explain why water moves up the straw when Mpho sucks at the end. {] (b) (i) Name the part of the vascular bundles represented by the straw. AN (i) Name the process occurring through the structure named in(b\(i) ool] © BEC 2008 s69703101N0« Fe lines teefor 8 \Examior's 41 (a) Define hormone. (b) Complete Table 11.1 to show hormones, their sources and their functions. Table 11.1 hormone source pancreas | adrenal gland | prepares body for action © BEC 2004 (0s60)0301ND« [Turn over14 42. Neo made dough using yeast. She took two equal masses of dough and placed them in two identical dishes at different temperatures as shown in Fig. 12.1A. 30°c 60°C lope! tae start of experiment Fig. 12.18 ‘After one hour the dough in the two dishes is as shown in Fig. 12.1B. = ox after one hour Fig. 12.18 (a) (i) Using the information in Fig. 12.1, describe any changes that had taken place in each batch of dough in dishes X and Y, after one hour. x. Y i) Explain the differences in the results for the two batches of dough. ola] (b) Suggest why itis convenient to use microorganisms in biotechnology. i) eC 2004 oseanaionos lamers se15 Question 13 starts on page 16 © BEC 2004 056003/01N08 [Turn over16 13. Table 13.1 shows the results of an experiment to investigate the effect of temperature on a protein digesting enzyme. Table 13.1 temperature/ | time taken for complete °C digestion/s 20 250 25 210 30 150 35 105 40 140 45, 170 (a) Plot the results on the grid provided. - OTT [3] (b) (i) State the optimum temperature for the reaction. (i) Give a reason for your answer in (i). sn2 © BEC 2004 569109001N0$ fo ezarnorsfee v eure (c) This experiment was carried out at pH 5, which is close to the optimum for this enzyme. Explain what will happen at the times taken for digestion to complete if the pH is changed to 9. ool2] ©AEC 2004 ‘ose070a101N04 [Turn overfr 8 ens 14. Fig. 14.1 shows a diagram of a kidney machine. ad _ blood flow {0 a T= dialysis fluid out pump | | bubble trap - | dialysis | tube substances diffuse out] of blood dialysis fluid in —>— Fig. 14.4 (a) (i) Name the process by which waste products move from blood into the dialysis fluid. 0 | State the property of the dialysis tube that makes it suitable for use in the kidney | machine. [1] (b) Explain how glucose is prevented from leaving the blood. | [2] ~ (6) Suggest how the efficiency of the kidney machine can be improved [2] (© BEC 2004 5691031010819 for 15 (a) State two disadvantages of asexual reproduction. [2] (b) Complete Table 15.1 by filing in two named methods of asexual reproduction and examples of plants where they can be applied. Table 15.1 example 4) ‘rest of Carpe iometona Examinations part the Unverty ol Cavege Lac ExarinatonsSypeate(UGLES) whe Waa depart ‘he Unvesey of carenage. © REC 2008 oseaiag10mos(013) einsseid pue eumesedwe: woo! 1 up yz st Se6 Aue Jo 9jou! eu0 Jo euunjon ou, se” | se” ama | amd | arnt” | smn” | mm a8 na dN ota ‘dnoip ‘squawie]a ey Jo e142 1 PoHEd OUL A3aHS viva ©BEC 2004