Cambridge IGCSE Physical Science 0652 — 2007 Oct/Nov Paper 6 · Variant 1

This document consists of 16 printed pages. IB07 11_0652_06/4RP © UCLES 2007 [Turn over *1881843657* For Examiner's Use 1 2 3 4 5 6 Total UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICAL SCIENCE 0652/06 Paper 6 Alternative to Practical October/November 2007 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. 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. DO NOT WRITE IN ANY BARCODES. 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. www.XtremePapers.com

2 © UCLES 2007 0652/06/O/N/07 For Examiner's Use 1 Some students are making a water storage system. Their design is shown in Fig. 1.1. Energy is absorbed by the solar panels and is stored in a battery. The power of the battery turns an electric motor linked to a water pump. The water is stored in a tank for use at any time. solar panel sunlight battery V A electric motor well water pump water storage tank Fig. 1.1 (a) Light energy is absorbed by the solar panel. In what form is the energy (i) in the battery, (ii) in the shaft of the electric motor, (iii) in the water contained in the storage tank? [3] (b) (i) Fig. 1.2 shows the ammeter and voltmeter dials when the electric motor is working. Read and record the current and voltage. A 5 0 10 V 0 5 10 15 Fig. 1.2

3 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use current A voltage V [2] (ii) The electric motor works for 10 minutes. Calculate the work done by the electric motor using the equation shown below. work done in joules = time in seconds x current x voltage. work done = J [2] (iii) During this time, 100 kg of water has been lifted to a height of 20 m. Calculate the work done, using the equation shown below. work done in joules = mass of water (kg) x distance raised (m) x 10 work done = J [1] (c) (i) Suggest one thing that will happen if the electric motor does not stop working. [1] (ii) Suggest a method of controlling the electric motor to prevent this happening. [1]

4 © UCLES 2007 0652/06/O/N/07 For Examiner's Use 2 The teacher gave two students a set of three colourless solutions, labelled X, Y and Z. He also gave them solution P which is an indicator. Solution P is colourless in an acidic solution but pink in an alkaline solution. The students added solution P to samples of the solutions X, Y and Z. Fig. 2.1 shows the results. solution X solution Y solution Z colourless pink pink Fig. 2.1 (a) Decide whether solutions X, Y and Z are acidic or alkaline. solution X solution Y solution Z [2] (b) The students wanted to deduce the name of the acid. They carried out a test that showed that the acid contained sulphate ions. (i) Name the reagent that they added to the acid. [1] (ii) Describe what they observed when this reagent was added to the acid. [1] (iii) Name the acid. [1] (c) The students placed about 1 cm3 of solution Y in a test-tube and added one drop of solution P. Then they added solution X, a few drops at a time. After a few drops had been added there was no change in colour, but when more drops of solution X had been added, the colour changed. (i) There was no change in colour when the first few drops of solution X had been added. Why was this? [1]

5 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use (ii) Suggest how the colour changed when more drops of solution X were added. The colour changed from to [1] (iii) What kind of reaction took place between solution X and solution Y? [1] (d) Fig. 2.2 shows the result of two more experiments that the students carried out. Study their observations and then suggest the names of solutions Y and Z. test result 1 1 cm3 of zinc sulphate solution was placed in a test-tube, then solution Y was added a little at a time. At first there was a white precipitate that dissolved when more solution Y was added. 2 1 cm3 of solution Z was placed in a test-tube. Then solution X was added. The mixture bubbled. A gas was given off that turned limewater milky Fig. 2.2 name of solution Y name of solution Z [2]

6 © UCLES 2007 0652/06/O/N/07 For Examiner's Use 3 A student investigated the way in which the current through a resistance wire varied with the length of the wire. He used the circuit shown in Fig. 3.1. A fixed resistance A B 0 100 1 metre wire crocodile clip y Fig. 3.1 The resistance wire, 100 cm long, was fixed on to a metre ruler. One metre of the resistance wire had a resistance of 4.5 ohms. • The student touched the wire with the contact and noted length y, and I, the reading of the ammeter. • He noted these readings in the first and third columns of Fig.3.2. • He repeated this procedure, choosing different lengths of wire each time. • He calculated the resistance R of the length of wire, y, used for each reading. • He found V, the potential drop for each length of wire by multiplying the resistance R by the current I. length of wire y / cm resistance of wire R / ohms ammeter reading I / amps potential drop V / volts 10 0.45 0.81 0.36 25 40 1.80 60 70 3.15 0.39 1.2 Fig. 3.2

7 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use (a) (i) Fig. 3.3 shows the ammeter dials for the three missing readings. Read the ammeters and record the readings in the third column of Fig. 3.2. [3] A 0.5 0 1.0 y = 25 cm A 0.5 0 1.0 y = 40 cm A 0.5 0 1.0 y = 60 cm Fig. 3.3 (ii) Calculate R, the resistance of the 25 cm and 60 cm lengths of wire by using the formula. R = 100 4.5 y × ohms Record the values in the second column of Fig. 3.2. [1] (iii) Complete the last column of Fig. 3.2 by calculating the missing values for V, the potential drop. Use the following formula; V = R x I volts [1]

8 © UCLES 2007 0652/06/O/N/07 For Examiner's Use (b) Plot a graph of V, the potential drop against y, the length of the wire. Plot y on the horizontal axis. Join the points by a smooth curve that passes through the point (0,0). [3] (c) The experiment is repeated using a cell with a larger voltage but the same wire. Draw a second curve on your graph to show the result you would expect. Explain how you decided this. Label this curve “expected result”. [2]

9 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use 4 The teacher shows the class an experiment to find the mass of one mole of a hydrocarbon. The hydrocarbon is a liquid at room temperature. It boils at about 80 oC. The apparatus is shown in Fig. 4.1. The teacher does the experiment twice. steam out steam in large syringe hypodermic syringe jacket rubber cap Fig. 4.1 • A large syringe is surrounded by a transparent plastic jacket. • At first, the syringe contains about 10 cm3 of air. The nozzle of the syringe has a rubber cap over it. • Steam is passed through the jacket for a few minutes to raise the temperature of the syringe to that of steam. • The volume of air in the syringe is read and recorded. • A hypodermic syringe fitted with a needle is filled with the hydrocarbon liquid, then it is weighed. The mass of the hypodermic syringe is recorded. • The needle of the hypodermic syringe is pushed through the rubber cap of the large syringe and some of the hydrocarbon liquid is injected. • The hypodermic syringe is weighed again and its mass recorded • The volume contained in the large syringe is read and the volume is recorded. • The experiment is repeated using the same hydrocarbon liquid.

10 © UCLES 2007 0652/06/O/N/07 For Examiner's Use (a) (i) Fig. 4.2 shows the scale of the large syringe before and after the hydrocarbon liquid was injected. Read the volumes contained in the syringe and record them in Fig. 4.3 in the spaces marked experiment 2. [2] 10 20 30 40 70 80 90 100 cm3 before after Fig. 4.2 experiment 1 volume contained in the large syringe /cm3 mass of hypodermic syringe /g before after before after 13 94 15.90 16.10 change in volume/cm3 change in mass/g 81 0.20 experiment 2 volume contained in the large syringe /cm3 mass of hypodermic syringe /g before after before after change in volume /cm3 change in mass/g Fig. 4.3 (ii) Fig. 4.4 shows the balance windows for the masses of the hypodermic syringe before and after injecting the hydrocarbon liquid into the large syringe. Read these masses and record them in Fig. 4.3 in the spaces marked experiment 2. [2] before g 13.9 13.8 13.7 after g 13.7 13.6 13.5 Fig. 4.4 (iii) Complete Fig. 4.3 by finding the change in volume / cm3 and the change in mass / g. [2]

11 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use (b) What was the temperature of the syringe after steam had been passed in for a few minutes? [1] (c) The volume of one mole of gas at this higher temperature is 30 dm3. (i) Use the data from experiment 1 to calculate the mass of 30 dm3 (30 000 cm3) of the hydrocarbon vapour. mass of 30 dm3 of hydrocarbon vapour = [2] (ii) Use the data in Fig. 4.5 and your result from (c)(i) to suggest the identity of the hydrocarbon used in the experiments. You must show your working.[Ar: H, 1; C, 12] name of hydrocarbon methane ethane propane butane pentane hexane formula CH4 C2H6 C3H8 C4H10 C5H12 C6H14 Fig. 4.5 name of the hydrocarbon: [1]

12 © UCLES 2007 0652/06/O/N/07 For Examiner's Use 5 A series of experiments was done to find out how temperature change affects the speed of reaction. Marble (calcium carbonate) was reacted with dilute hydrochloric acid at different temperatures. M S TIMER pieces of marble ACID Fig. 5.1 • A test-tube was half-filled with dilute hydrochloric acid. • The acid was gently warmed and its temperature was recorded in Fig. 5.2. • A small piece of marble was placed in the tube and the cork was quickly replaced. • A digital clock was started. • When the gas collection tube was full, the clock was stopped. experiment number 1 2 3 4 temperature / oC 24 37 49 62 time taken / s 148 22 Fig. 5.2 (a) (i) Name two more pieces of apparatus, not shown in Fig. 5.1, that the student will need for these experiments. 1. 2. [2] (ii) What must the gas collection tube be filled with, before each experiment begins? [1] (iii) Name the gas that was collected. [1]

13 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use M S M S experiment 2 experiment 3 Fig. 5.3 (b) Read the digital clocks shown in Fig. 5.3, for the missing times, and record them in Fig. 5.2. [2] (c) Suggest one change to the method to improve the accuracy of the experiment. [1] (d) Use the information in Fig. 5.2 to show how the speed of reaction is affected by change of temperature. [2] (e) Explain your answer in (d) in terms of the behaviour of the reacting particles. [1]

14 © UCLES 2007 0652/06/O/N/07 For Examiner's Use 6 An experiment was done to investigate the thermal conductivity of five different metals. • A student took a 20 cm long bar of metal and heated one end. Then he hammered the end until there was a dent in it. This is shown in Fig. 6.1. • He dripped wax from a lit candle into the dent and then placed a small glass bead in the wax. When the metal bar was cold the wax became solid and the glass bead was stuck to the bar. • He rested the cold bar on a tripod, shown in Fig. 6.2, so that the glass bead was underneath the bar. • He started a stop clock and heated the other end of the bar using a moderately hot flame. • When the wax melted and the glass bead dropped off, he stopped the clock. He recorded the time taken for the wax to melt in Fig. 6.3. metal bar molten wax dent glass bead candle Fig. 6.1 metal bar glass bead Fig. 6.2

15 © UCLES 2007 0652/06/O/N/07 [Turn over For Examiner's Use metal copper iron steel aluminium nickel time taken for the wax to melt / s 26 130 190 Fig. 6.3 M S M S aluminium nickel Fig. 6.4 (a) Read the digital timers in Fig. 6.4 and record the results for the metals aluminium and nickel in Fig. 6.3. [2] (b) (i) What physical property enabled the student to make a dent in the hot bar? [1] (ii) Suggest which of the metals was hardest to dent. Explain why you chose this metal. metal explanation [2] (c) What type of substance is candle wax? Name the main source of candle wax. type of substance source [2] (d) The student wanted to carry out this experiment with a bar of magnesium. Suggest why the teacher did not allow him to do this. [1]

16 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 (UCLES) 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. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. © UCLES 2007 0652/06/O/N/07 For Examiner's Use (e) Suggest one way to make this experiment a fairer test. [1] (f) The student did the experiment with a 20 cm glass bar. The wax did not melt and the glass bead did not fall off. Explain the difference in the properties of metal and glass that is shown by this experiment. [1]

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the October/November 2007 question paper 0652 PHYSICAL SCIENCE 0652/06 Paper 6 (Alternative to Practical), maximum raw mark 60 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. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination. • CIE will not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the October/November 2007 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Page 2 Mark Scheme Syllabus Paper IGCSE – October/November 2007 0652 06 © UCLES 2007 1 (a) (i) chemical energy(reject “electrical energy”) [1] (ii) motion/movement/kinetic/energy [1] (iii) (gravitational) potential energy [1] No mark for part if more than one form of energy given (b) (i) current = 6 amps (A) no tolerance voltage = 12 volts (V) no tolerance [2] (ii) 600 x 6 x 12 = 43 200 J (ecf) [2] (iii) 100 x 10 x 20 = 20 000 J (ecf) [1] (c) (i) the water tank will overflow/the battery will “be flattened” OWTTE(1) (do not accept ‘will overheat’) (ii) arrange a switch to operate when tank is full/arrange a time switch (to operate the battery for a limited period only) OWTTE (method must match the answer to (i)) (1) [2] [Total: 10] 2 (a) solution X = acid (1) Y and Z (both needed) are alkaline/alkali (1) [2] (b) (i) barium chloride (nitrate) (solution) [1] (ii) white (precipitate) (independent mark) [1] Accept milky/chalky (iii) sulphuric acid [1] Accept correct formula where given but not hydrogen sulphate (c) (i) Not enough of solution X had been added to react with all of solution Y/ the pH of the colour change had not been reached (OWTTE) (An understanding that sufficient acid must be added) [1] (ii) The colour changed from pink to colourless [1] (iii) neutralisation [1] (d) solution Y = (sodium/ammonium) hydroxide (1) solution Z = (sodium) carbonate (1) [2] (accept lithium or potassium as the metal and allow a correct formula, do not allow calcium carbonate for Z, it is not a solution) [Total: 10]

Page 3 Mark Scheme Syllabus Paper IGCSE – October/November 2007 0652 06 © UCLES 2007 3 (a) (i) 0.65, 0.53, 0.43 (+/– 0.01 A) [3] (ii) 25 x 0.045 = 1.1, 60 x 0.045 = 2.7 (ohms) (one or both correct, read first decimal place) [1] (iii) 1.1 x 0.65 = 0.72 1.8 x 0.53 = 0.95 2.7 x 0.43 = 1.05 (errors carried forward) 2 or 3 values correct (2), 1 correct (1) [2]* (b) at least one of axes labelled (including unit) and sensible choice of scale (1) points correctly plotted (ecf) (allow one error, +or– 1 small square) (1) line drawn through the origin (1) (if axes reversed, –1 mark) [3] (use of OHP overlay can assist marking) (c) curve is above the first curve, passing through origin [1]* *not as on question paper [Total: 10] 4 (a) (i) before 15 cm3, after 94 cm3. +/– 0.5 cm3, d.p. not needed [2] (ii) before 13.82 g, after 13.63 g (+/– 0.01 g) [2] (iii) 94 – 15 = 79 cm3 (1) 13.82 – 13.63 = 0.19 g (1) (ecf) [2] (b) 100°C [1] (c) (i) 0.2 x 30 000/81 (1) = 74 (1) [2] (ii) C5H12 = 60 + 12 = 72 so it is pentane [1] [Total: 10]

Page 4 Mark Scheme Syllabus Paper IGCSE – October/November 2007 0652 06 © UCLES 2007 5 (a) (i) Bunsen burner or other source of heat (1) thermometer (1) [2] (ii) fill with water [1] (iii) carbon dioxide (or formula) [1] (b) 125 s, 39 s no tolerance [2] (c) measure the volume(amount) of the gas/ measure the volume of acid used/use piece of marble of equal mass(size) other sensible suggestion [1] (d) use of data to show that at higher temperatures time to react is shorter (1)higher temperatures give faster reaction (1) [2] (e) at higher temperatures the particles move faster/collide with the marble more often [1] [Total: 10] 6 (a) aluminium = 45s, (1) nickel = 69 s (1) no tolerance [2] (b) (i) metal softens (melts) when heated/is malleable [1] (ii) steel (1) it is an alloy/has a high melting point (1) REJECT any connection with the data in the table [2] (c) hydrocarbon (1) petroleum/crude oil (1) OR fat (lipid) (1) animal fat or beeswax (1) [2] (d) magnesium melts easily OR could ignite OWTTE [1] (e) lag the metal bars to prevent heat loss/use a controlled form of heating/ other sensible suggestion [1] (f) metal will conduct heat, glass will not conduct heat (must be a reference to both materials) [1] [Total: 10]