0620 s08 qp_6

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Published on March 9, 2014

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w w ap eP m e tr .X w om .c s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *1427920488* 0620/06 CHEMISTRY May/June 2008 Paper 6 Alternative to Practical 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 pencil for any diagrams, graphs 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. For Examiner's Use 1 2 3 4 5 6 7 Total This document consists of 12 printed pages. IB08 06_0620_06/5RP © UCLES 2008 [Turn over

2 1 A solution of copper sulphate was made by reacting excess copper oxide with dilute sulphuric acid. The diagram shows the method used. 50 cm3 of dilute sulphuric acid was measured into a beaker DILUTE SULPHURIC ACID copper oxide was added until all the sulphuric acid had reacted the mixture was filtered warm (a) Complete the empty boxes to name the pieces of apparatus. [3] (b) What does the term excess mean? [1] (c) Draw a labelled diagram to show how the mixture was filtered. [2] [Total: 6] © UCLES 2008 0620/06/M/J/08 For Examiner's Use

3 2 The diagram shows an experiment to pass electricity through lead bromide. Electricity has no effect on solid lead bromide. For Examiner's Use d.c. power supply bulb LEAD BROMIDE TOXIC heat (a) (i) Clearly label the electrodes on the diagram. [1] (ii) Suggest a suitable material to make the electrodes. [1] (b) Give two observations expected when the lead bromide is heated to melting point. 1. 2. [2] (c) State two different safety precautions when carrying out this experiment. 1. 2. [2] [Total: 6] © UCLES 2008 0620/06/M/J/08 [Turn over

4 3 Sulphur dioxide gas is denser than air and soluble in water. A sample of sulphur dioxide can be prepared by adding dilute hydrochloric acid to sodium sulphite and warming the mixture. Study the diagram of the apparatus used. water (a) Fill in the boxes to show the chemicals used. [2] (b) Show by using an arrow, on the diagram, where heat is applied. [1] (c) Identify and explain two mistakes in the diagram. Mistake 1 Mistake 2 [2] [Total: 5] © UCLES 2008 0620/06/M/J/08 For Examiner's Use

5 4 A student investigated the reaction between potassium manganate(VII) and a metallic salt solution. For Examiner's Use Two experiments were carried out. Experiment 1 (a) About 1 cm3 of aqueous sodium hydroxide was added to a little of the salt solution A and the observation noted. green precipitate formed observation (b) A burette was filled with potassium manganate(VII) solution up to the 0.0 cm3 mark. By using a measuring cylinder, 25 cm3 of solution A of the salt was placed into a conical flask. The flask was shaken to mix the contents. The potassium manganate(VII) solution was added to the flask, and shaken to mix thoroughly. Addition of potassium manganate(VII) solution was continued until there was a pale pink colour in the contents of the flask. Use the burette diagram to record the volume in the table and complete the column. 25 26 27 final reading Experiment 2 (c) Experiment 1(b) was repeated using a different solution B of the salt, instead of solution A. Use the burette diagrams to record the volumes in the table and complete the table. 15 16 29 17 30 initial reading © UCLES 2008 28 final reading 0620/06/M/J/08 [Turn over

6 (d) About 1 cm3 of aqueous sodium hydroxide was added to a little of the solution in the flask and the observation noted. observation red-brown precipitate Table of results Burette readings / cm3 Experiment 1 Experiment 2 final reading initial reading difference [4] (e) (i) In which Experiment was the greatest volume of potassium manganate(VII) solution used? [1] (ii) Compare the volumes of potassium manganate(VII) solution used in Experiments 1 and 2. [2] (iii) Suggest an explanation for the difference in the volumes. [2] (f) Predict the volume of potassium manganate(VII) solution which would be needed to react completely with 50 cm3 of solution B. [2] © UCLES 2008 0620/06/M/J/08 For Examiner's Use

7 (g) Explain one change that could be made to the experimental method to obtain more accurate results. For Examiner's Use change explanation [2] (h) What conclusion can you draw about the salt solution from (i) experiment 1(a), [1] (ii) experiment 2(d)? [1] [Total: 15] © UCLES 2008 0620/06/M/J/08 [Turn over

8 5 Two different solids, T and V, were analysed. T was a calcium salt. The tests on the solids and some of the observations are in the following table. Complete the observations in the table. tests For Examiner's Use observations tests on solid T white solid (a) Appearance of solid T. (b) A little of solid T was dissolved in distilled water. The solution was divided into three testtubes. colour (i) The pH of the first portion of the solution was tested. orange pH 5 (ii) To the second portion of solution was added excess aqueous sodium hydroxide. [2] (iii) To the third portion of solution was added excess ammonia solution. [2] © UCLES 2008 0620/06/M/J/08

9 tests For Examiner's Use observations tests on solid V (c) Appearance of solid V. green crystals (d) A little of solid V was dissolved in distilled water. The solution was divided into three testtubes. The smell of the solution was noted. (i) Test (b)(i) was repeated using the first portion of solution. smells of vinegar (iii) Test (b)(iii) was repeated using the third portion of solution. orange pH (ii) Test (b)(ii) was repeated using the second portion of the solution. colour 6 pale blue precipitate pale blue precipitate soluble in excess to form a dark blue solution. (e) What do tests (b)(i) and (d)(i) tell you about solutions T and V? [2] (f) What additional conclusions can you draw about solid V? [2] [Total: 8] © UCLES 2008 0620/06/M/J/08 [Turn over

10 6 The speed of reaction between excess magnesium and dilute hydrochloric acid was investigated using the apparatus below. 0 10 20 30 40 50 60 gas syringe dilute hydrochloric acid excess magnesium The volume of hydrogen produced was measured every minute for six minutes. (a) Use the gas syringe diagrams to complete the table. Table of results time / minutes volume of hydrogen / cm3 gas syringe diagram 0 10 20 30 40 50 60 0 10 20 30 40 50 60 0 10 20 30 40 50 60 0 10 20 30 40 50 60 4 0 10 20 30 40 50 60 5 0 10 20 30 40 50 60 6 0 10 20 30 40 50 60 0 1 2 3 [4] © UCLES 2008 0620/06/M/J/08 For Examiner's Use

11 (b) Plot the results on the grid below. Draw a smooth line graph. For Examiner's Use 70 60 50 40 volume of hydrogen / cm3 30 20 10 0 0 1 2 3 4 5 6 time / minutes [4] (c) Why is the volume of gas given off the same at 5 minutes and 6 minutes? [1] (d) Which point appears to be inaccurate? Explain why. [2] (e) Sketch on the grid the graph you would expect if the experiment were repeated using the same volume of acid which was half as concentrated. [2] [Total: 13] © UCLES 2008 0620/06/M/J/08 [Turn over

12 7 This label is from a container of ‘Bite Relief’ solution. For Examiner's Use BITE RELIEF FOR FAST RELIEF FROM INSECT BITES AND STINGS Active ingredient: Ammonia Also contains water and alcohol DIRECTIONS FOR USE: Use cotton wool to dab the solution on the affected area of the skin (a) Give a chemical test to show the presence of ammonia in Bite Relief solution. test result [2] (b) What practical method could be used to separate the mixture of alcohol (bp 78°C) and water (bp 100°C)? [2] (c) Give a chemical test to show the presence of water. test result [2] (d) What would be the effect of touching the alcohol with a lighted splint? [1] [Total: 7] 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 2008 0620/06/M/J/08

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