Embed Size (px)
This document consists of 9 printed pages and 3 blank pages.
[Turn overIB18 11_0620_61/3RP© UCLES 2018
*5730558021*
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 an HB pencil for any diagrams or graphs.Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.
Answer all questions.Electronic calculators may be used.You may lose marks if you do not show your working or if you do not use appropriate units.
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.
CHEMISTRY 0620/61
Paper 6 Alternative to Practical October/November 2018
1 hour
Candidates answer on the Question Paper.
No Additional Materials are required.
Cambridge International ExaminationsCambridge International General Certificate of Secondary Education
The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
2
0620/61/O/N/18© UCLES 2018
1 A student obtains pure, dry samples of sand and sodium chloride from a mixture of sand and sodium chloride.
The student uses the apparatus shown. The method consists of six steps, A, B, C, D, E and F, which are shown in the wrong order.
mixture ofsand and
sodium chloride
rinse the sandwith water
A B
add waterand stir
C
heat toevaporate
leave the sand todry on filter paper
D E F
heat
.........................................
(a) Order the steps in the method.
A ......... ......... ......... ......... ......... [2]
(b) Complete the box to name the apparatus in D. [1]
(c) Why is the sand rinsed with water in B?
....................................................................................................................................................
.............................................................................................................................................. [1]
(d) Name the process in F.
.............................................................................................................................................. [1]
(e) How could the purity of the sodium chloride obtained be checked?
.............................................................................................................................................. [1]
[Total: 6]
3
0620/61/O/N/18© UCLES 2018 [Turn over
2 A student investigated the rate of reaction between dilute nitric acid and lumps of magnesium carbonate. The apparatus shown was used.
balance
cotton wool
dilute nitric acid lumps of magnesium carbonate
Lumpsofmagnesiumcarbonatewereadded toaconical flask.40cm3 of dilute nitric acid was thenpouredintotheconicalflaskusingameasuringcylinder.Themagnesiumcarbonatewasinexcess.
Theconicalflaskwasplacedonabalance.Cottonwoolwasplacedinthetopoftheconicalflask.
Themassoftheconicalflaskanditscontentswasmeasuredandatimerwasstarted.Themassoftheconicalflaskanditscontentswasmeasuredeveryminutefor7minutes.
4
0620/61/O/N/18© UCLES 2018
(a) Usethebalancediagramstorecordthemassoftheconicalflaskanditscontentsinthetable. Completethetabletoworkoutthetotallossofmassoftheconicalflaskanditscontentssince
the start of the experiment.
86
85
86
87
g
time / minutes
0
balance diagram mass of conical flaskand its contents / g
total lossof mass / g
84
85
86
83
84
85
g
1
83
84
85
g
2
83
84
85
g
3
g
4
83
84
85
g
83
84
85
g
83
84
85
g
5
6
7
[3]
5
0620/61/O/N/18© UCLES 2018 [Turn over
(b) Plot the results on the grid. Draw a smooth line graph.
2.5
2.0
1.5
1.0
0.5
00 1 2 3
time / minutes
total lossof mass / g
4 5 6 7
[3]
(c) The average rate of reaction can be calculated using the equation shown.
average rate of reaction =total loss of mass / g
time taken / s
Calculatetheaveragerateofreactionforthefirst30seconds of the reaction. Deduce the unit.
rate = ..............................
unit = .............................. [3]
(d) The experiment is repeated using an excess of powdered magnesium carbonate. All other conditions are kept the same.
Sketch on the grid the graph you would expect. [2]
6
0620/61/O/N/18© UCLES 2018
(e) (i) Whydoesthemassoftheconicalflaskanditscontentsdecrease?
.............................................................................................................................................
....................................................................................................................................... [1]
(ii) Suggest the purpose of the cotton wool.
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [2]
(iii) Why does the graph level off? Explain your answer.
.............................................................................................................................................
....................................................................................................................................... [2]
(f) Give one advantage and one disadvantage of using a burette instead of a measuring cylinder toaddthedilutenitricacidtotheconicalflask.
advantage ..................................................................................................................................
disadvantage ............................................................................................................................. [2]
[Total: 18]
7
0620/61/O/N/18© UCLES 2018 [Turn over
3 Two solid salts, solid G and solid H, were analysed. Tests were done on each solid.
tests on solid G
Some of the tests and observations are shown.
tests on solid G observations
test 1
AflametestwasdoneonsolidG. lilac colour
Solid G was dissolved in distilled water.
test 2
Dilute hydrochloric acid was added to the solution. The solution was warmed gently. The gas producedwas testedwith filter paperwhich had been dipped in acidified aqueouspotassium manganate(VII).
filterpaperturnedfrompurpletocolourless
(a) Name the gas produced in test 2.
.............................................................................................................................................. [1]
(b) Identify solid G.
....................................................................................................................................................
.............................................................................................................................................. [2]
8
0620/61/O/N/18© UCLES 2018
tests on solid H
Solid H was calcium nitrate.
Complete the expected observations.
Solid H was added to distilled water in a test-tube. The test-tube was shaken to dissolve solid H. The solution was divided into four portions in four test-tubes.
(c) (i) Dropsofaqueoussodiumhydroxidewereaddedtothefirstportionofthesolution.
observations ................................................................................................................. [2]
(ii) An excess of aqueous sodium hydroxide was then added to the mixture from (c)(i).
observations .................................................................................................................. [1]
(d) An excess of aqueous ammonia was added to the second portion of the solution.
observations ......................................................................................................................... [1]
(e) Dilute nitric acid and aqueous silver nitrate were added to the third portion of the solution.
observations ......................................................................................................................... [1]
(f) Aluminium foil and aqueous sodium hydroxide were added to the fourth portion of the solution. The mixture was warmed and the gas produced was tested.
observations ...............................................................................................................................
.............................................................................................................................................. [2]
[Total:10]
9
0620/61/O/N/18© UCLES 2018 [Turn over
4 Propanone and ethyl ethanoate are both solvents which can be used to remove paint.
Plan an investigation to determine which of these two solvents is better to use to remove paint.
You are provided with glass slides, paint, the two solvents and common laboratory apparatus.
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
...........................................................................................................................................................
..................................................................................................................................................... [6]
[Total: 6]
10
0620/61/O/N/18© UCLES 2018
BLANK PAGE
11
0620/61/O/N/18© UCLES 2018
BLANK PAGE
12
0620/61/O/N/18© UCLES 2018
BLANK PAGE
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.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after the live examination series.
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.
![(GXFDWLRQ CHEMISTRY 0620/62[2] 0620/62/O/N/17 4 0620621 US 217 Experiment 2 Experiment 1 was repeated using 2.0 g, 3.0 g, 4.0 g and 6.0 g of solid T. The minimum temperature of the](https://img.pdfslide.net/doc/110x75/60a653dc991b451fed4aac2a/gxfdwlrq-chemistry-062062-2-062062on17-4-0620621-us-217-experiment-2-experiment.jpg?t=1701263131)
![(GXFDWLRQ CHEMISTRY 0620/62 - cienotes.com · (k) Suggest how the reliability of the results could be checked..... [2] [Total: 16] 7 CL 2018 062062M18 [Turn over 3 Two substances,](https://img.pdfslide.net/doc/110x75/5d0ac1cf88c993e8538b7156/gxfdwlrq-chemistry-062062-k-suggest-how-the-reliability-of-the-results.jpg?t=1701263131)
![(GXFDWLRQ CHEMISTRY 0620/41...3 2019 06204119 [Turn over 2 (a)Sulfur exists as a number of different isotopes. What is meant by the term isotopes? [2] (b) A sulfide ion has the symbol](https://img.pdfslide.net/doc/110x75/606b61c18552256685210d1b/gxfdwlrq-chemistry-062041-3-2019-06204119-turn-over-2-asulfur-exists-as.jpg?t=1701263131)
![Brochure Biotechnology CCE - nitw.ac.in€¦ · v &hqwuh iru &rqwlqxlqj (gxfdwlrq ri 1,7 :dudqjdo 7kh &hqwuh iru &rqwlqxlqj (gxfdwlrq ri 1,7 :dudqjdo rujdql]hv &rqwlqxlqj (gxfdwlrq](https://img.pdfslide.net/doc/110x75/601d989752e83a0fbd4ca2c7/brochure-biotechnology-cce-nitwacin-v-hqwuh-iru-rqwlqxlqj-gxfdwlrq.jpg?t=1701263131)
![(GXFDWLRQ CHEMISTRY 0620/43 - … (0620)/0620_w17_qp_43.pdfWrite a chemical equation for the reaction..... [1] (ii) When iron(III) oxide is added to dilute sulfuric acid, an aqueous](https://img.pdfslide.net/doc/110x75/5a9f0b037f8b9a67178c4470/pdfgxfdwlrq-chemistry-062043-06200620w17qp43pdfwrite-a-chemical.jpg?t=1701263131)
