0620 w04 qp_6

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Published on March 11, 2014

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Centre Number Candidate Number Name UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education CHEMISTRY Paper 6 Alternative to Practical October/November 2004 1 hour Candidates answer on the Question Paper. No additional materials required. READ THESE INSTRUCTIONS FIRST Write your name, Centre number and candidate number at the top of this page. Write in dark blue or black pen in the spaces provided on the Question Paper. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. You may use a calculator. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. FOR EXAMINER’S USE 1 2 3 4 5 6 7 TOTAL This document consists of 11 printed pages and 1 blank page. IB04 11_0620_06/3RP  UCLES 2004 [Turn over If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page. Stick your personal label here, if provided. w w w .Xtrem ePapers.com

2  UCLES 2004 0620/06/O/N/04 For Examiner’s Use 1 The apparatus below was used to make hydrogen. Dilute hydrochloric acid was added to zinc. water A B (a) Identify the pieces of apparatus labelled A, B. [2] (b) Complete the boxes [1] (c) Give a test for hydrogen. test result [2]

3  UCLES 2004 0620/06/O/N/04 [Turn over For Examiner’s Use 2 The addition of calcium carbonate to excess dilute nitric acid produces carbon dioxide. The volume of carbon dioxide given off at 20 second intervals was recorded and plotted on the grid. 0 20 40 60 80 100 120 100 140 80 60 20 40 0 time/seconds volume of carbon dioxide/cm3 120 (a) Draw a smooth line graph on the grid. [1] (b) Circle the result which appears to be incorrect? Why have you selected this result? [2] (c) Why does the reaction slow down? [1]

4  UCLES 2004 0620/06/O/N/04 For Examiner’s Use 3 A liquid alkane was passed over heated aluminium oxide to make ethene. water liquid alkane and mineral wool aluminium oxide very strong heat ethene (a) What is the purpose of the mineral wool? [1] (b) What is this type of chemical reaction called? [1] (c) Give a test for ethene. test result [2] (d) What precaution should be taken in the experiment when the heat is removed? Explain. [2]

5  UCLES 2004 0620/06/O/N/04 [Turn over For Examiner’s Use 4 A student investigated what happened when sodium thiosulphate dissolved in water. Experiment 1 By using a measuring cylinder, 20cm3 of distilled water was poured into a polystyrene cup. Use the thermometer diagram to record the temperature of the water in the table. 1g of powdered sodium thiosulphate was added to the cup and the mixture stirred with a thermometer. Use the thermometer diagram to record the temperature of the solution. Experiment 2 Experiment 1 was repeated using 2g of powdered sodium thiosulphate. Record the temperature in the table. Experiments 3, 4 and 5 Experiment 1 was repeated using 3g, 4g and 5g of powdered sodium thiosulphate respectively. Record the temperatures in the table.

6  UCLES 2004 0620/06/O/N/04 For Examiner’s Use mass of sodium thiosulphate/g temperature/o C initial final 30 25 20 30 25 20 20 15 10 20 15 10 30 25 20 25 20 15 25 20 15 25 20 15 25 20 15 15 10 5 15 10 5 0 1 2 3 4 5 [5]

7  UCLES 2004 0620/06/O/N/04 [Turn over For Examiner’s Use (a) Plot the results of the experiments on the grid below. Draw a straight line graph. Clearly label the graph. [5] mass of thiosulphate added/g final temperature/o C 0 1 2 3 4 5 6 30 25 20 15 5 10 0 (b) (i) Use your graph to estimate the temperature of the reaction mixture if 3.5 g of powdered sodium thiosulphate were added to 20cm3 of water. Indicate clearly on the graph how you obtained your answer. [2] (ii) From your graph work out the temperature of the reaction mixture if 6 g of powdered sodium thiosulphate were added to 20cm3 of water. Indicate clearly how you used your graph. [2] (c) What type of chemical reaction occurs when sodium thiosulphate dissolves in water? [1]

8  UCLES 2004 0620/06/O/N/04 For Examiner’s Use (d) Explain how the temperature changes would differ in the experiments if 40cm3 of water were used. [2] (e) Explain why the sodium thiosulphate was powdered before being used. [2] (f) Predict what the temperature of the reaction mixture in Experiment 5 would be after 1 hour. Explain your answer. [2] (g) Suggest one change you could make to the apparatus used in the experiments to obtain more accurate results. [1]

9  UCLES 2004 0620/06/O/N/04 [Turn over For Examiner’s Use 5 Salt E, which is ammonium chloride was tested. Record all observations in the table. tests observations (a) Describe the appearance of E [2] (b) Using a spatula salt E was placed in a hard glass test-tube. Inside the top of the tube was suspended a piece of damp blue litmus paper next to a piece of damp red litmus paper. E was heated gently until gas came out of the tube. red litmus went blue then blue litmus went red (c) E was dissolved in water to make an aqueous solution. The solution was divided into three test-tubes (i) To the first portion, was added a few drops of dilute nitric acid and about 1cm3 of aqueous silver nitrate. [2] (ii) To the second portion of solution E, was added about 1cm3 of lead nitrate solution. [2] (iii) To the third portion of solution E, was added about 1cm3 of aqueous sodium hydroxide. The mixture was boiled gently and the gas given off was tested with indicator paper [2] (d) Name the gas given off in test (c)(iii). [1] (e) Explain the observations in test (b). [2]

10  UCLES 2004 0620/06/O/N/04 For Examiner’s Use 6 Describe a chemical test to distinguish between each of the following pairs of substances. An example is given. oxygen and carbon dioxide test: glowing splint result: re-lights in oxygen, no effect with carbon dioxide (a) aqueous chlorine and aqueous sodium chloride test result with chlorine result with sodium chloride [2] (b) aqueous iron(II) chloride and aqueous iron(III) chloride test result with iron(II) chloride result with iron(III) chloride [2] (c) copper sulphate and copper carbonate test result with copper sulphate result with copper carbonate [2]

11  UCLES 2004 0620/06/O/N/04 For Examiner’s Use 7 Forged Banknote A fake banknote can be investigated by dissolving the ink off the paper. You are provided with four different inks from four different criminals. Describe an experiment to show which one of these inks is the same as the ink from the banknote. You can use a labelled diagram to help you answer the question. [6]

12 University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 0620/06/O/N/04 BLANK PAGE

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