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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level
CHEMISTRY Paper 4 Alternative to Practical
Candidates answer on the Question Paper. No Additional Materials are required.
5070/41 May/June 2011
1 hour
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 or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES.
Answer all questions. Write your answers in the spaces provided in the Question Paper. 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
DC (NF/DJ) 32756/3 ? UCLES 2011
This document consists of 16 printed pages.
[Turn over
2 1
cm3 50
40
30
20
10
For Examiner's
Use
The apparatus shown above contains aqueous ethanoic acid. (a) Name the apparatus.
.........................................................
[1]
(b) What is the volume of aqueous ethanoic acid in the apparatus?
........................................... cm3 [1] (c) What is observed when
(i) a few drops of litmus solution are added to some aqueous ethanoic acid, ............................................................................................................................. [1]
(ii) aqueous ethanoic acid is added to a test-tube containing a few grams of solid calcium carbonate? ............................................................................................................................. [1]
(d) Name and give the formula of the alcohol which, on oxidation, gives ethanoic acid. name ......................................... formula ........................................................................................................................ [1] [Total: 5]
? UCLES 2011
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3
2 Calcium sulfate crystals have the formula CaSO4.xH2O where x is a whole number. (a) A student places some calcium sulfate crystals in a previously weighed crucible.
mass of crucible + crystals mass of crucible
= 11.20 g = 5.80 g
Calculate the mass of crystals used in the experiment.
For Examiner's
Use
............................................... g [1]
(b) The crucible is heated to remove all the water from the crystals. The crucible and contents are allowed to cool and are then reweighed.
mass of crucible and contents after heating = 10.07 g
(i) Calculate the mass of calcium sulfate after heating.
............................................... g [1] (ii) Calculate the mass of water removed by heating.
(c) Calculate
(i) the formula mass, Mr, of CaSO4, (ii) the formula mass, Mr, of water H2O.
[Ar: H,1; O,16; S, 32; Ca, 40]
............................................... g [1]
CaSO4 ..............................................
H2O ...................................................
[1]
? UCLES 2011
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[Turn over
4 (d) In the formula CaSO4.xH2O, x is a whole number.
Use the equation below to calculate the value of x.
x
=
answer (b)(ii) ? Mr CaSO4 answer (b)(i) ? Mr H2O
For Examiner's
Use
x = ......................................
[1]
(e) What general name is given to compounds that have lost all their water of crystallisation?
..................................................
[1]
[Total: 6]
? UCLES 2011
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5 3 The apparatus below is used to electrolyse water.
For Examiner's
Use
carbon electrodes
water containing a little sulfuric acid
anode +
? cathode
battery
(a) Why is a small volume of sulfuric acid added to the water? ..................................................................................................................................... [1]
(b) (i) Name the gas collected at the anode. gas ...................................................................................................................... [1]
(ii) Give a test for this gas. test ........................................................................................................................... observation .......................................................................................................... [1]
(iii) Write the ionic equation for the reaction taking place at the anode. ............................................................................................................................. [2]
? UCLES 2011
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[Turn over
6
(c) (i) Name the gas collected at the cathode.
For
Examiner's
gas ...................................................................................................................... [1] Use
(ii) Give a test for this gas.
test ...........................................................................................................................
observation .......................................................................................................... [1]
(iii) Write the ionic equation for the reaction taking place at the cathode.
............................................................................................................................. [1]
(d) When 20 cm3 of gas has been collected at the anode, what volume of gas will have been collected at the cathode?
........................................... cm3 [1] [Total: 9]
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7 In questions 4 to 8 inclusive, place a tick () in the box against the correct answer.
4 Which of the following is a property of hydrochloric acid? (a) It turns litmus paper blue. (b) It reacts with any metal to give hydrogen. (c) It liberates ammonia from ammonium salts. (d) It reacts with any base to give a salt.
For Examiner's
Use
[1] [Total: 1]
5 A student adds a small piece of sodium to a beaker half-filled with water. Which of the following is not correct? (a) Sodium reacts vigorously on the surface of the water. (b) The temperature of the water increases during the reaction. (c) Oxygen is produced during the reaction. (d) The resulting solution is aqueous sodium hydroxide.
[1] [Total: 1]
6 Metal R displaces metal S from a solution of its ions. Metal S displaces metal T from a solution of its ions.
What could R, S and T be?
R (a) calcium
(b) calcium
(c)
silver
(d)
zinc
S silver zinc calcium silver
T zinc silver zinc calcium
[1] [Total: 1]
? UCLES 2011
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[Turn over
8
7 A student adds an excess of zinc to 50 cm3 of 1.00 mol / dm3 hydrochloric acid at 20 ?C. For Hydrogen is produced. The experiment is repeated at 30 ?C and 40 ?C. In each case the Examiner's
volume of hydrogen collected is plotted against time.
Use
Which one of the following represents the volumes of hydrogen produced in the three experiments?
Volume of hydrogen /
cm3
40?C 30?C 20?C
Volume of hydrogen /
cm3
40?C 30?C
20?C
0
0
time / s
(a)
0
0
time / s
(b)
Volume of hydrogen /
cm3
20?C 30?C 40?C
0
0
time / s
Volume of hydrogen /
cm3
0 0
20?C 30?C 40?C
time / s
(c)
(d)
[Total: 1]
8 Which of the following is not a reaction of ethene? (a) Ethene reacts with ethanoic acid to form an ester. (b) Ethene polymerises into a material which is used to make plastic bags. (c) Ethene burns to form carbon dioxide and water. (d) Ethene decolourises aqueous bromine.
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[Total: 1]
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