11 0971 62 FP - Past Papers
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This document consists of 8 printed pages and 4 blank pages. [Turn over IB19 11_0971_62/FP © UCLES 2019 *4798355395* 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 0971/62 Paper 6 Alternative to Practical October/November 2019 1 hour Candidates answer on the Question Paper. No Additional Materials are required. Cambridge Assessment International Education Cambridge International General Certificate of Secondary Education (9 –1)
Transcript of 11 0971 62 FP - Past Papers
This document consists of 8 printed pages and 4 blank pages.
[Turn overIB19 11_0971_62/FP© UCLES 2019
*4798355395*
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 0971/62Paper 6 Alternative to Practical October/November 2019
1 hour
Candidates answer on the Question Paper.
No Additional Materials are required.
Cambridge Assessment International EducationCambridge International General Certificate of Secondary Education (9 –1)
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0971/62/O/N/19© UCLES 2019
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0971/62/O/N/19© UCLES 2019 [Turn over
1 Astudentdidasingletitrationtofindtheconcentrationofasolutionofdilutesulfuricacid.
Thestudentadded25.0cm3ofaqueoussodiumhydroxide toaconicalflask, followedbya fewdropsofindicator.Dilutesulfuricacidwasthenaddedtotheaqueoussodiumhydroxideuntilthesolutionwasneutral.
Theapparatususedisshowninthediagram.
aqueoussodium hydroxide
dilutesulfuric acid
(a) Completetheboxestonametheapparatus. [2]
(b) Nameasuitableindicatortouseinthetitrationandgivethecolourchange.
indicator.....................................................................................................................................
colourchangefrom........................................................to....................................................... [2]
(c) Whatreadingsshouldthestudenttakewhendoingthissingletitration?
..............................................................................................................................................[2]
(d) After the titration, the student discarded the contents of the conical flask and rinsed theconicalflaskwithdistilledwater.
Suggestandexplainwhatwouldbetheeffect,ifany,onthetitrationvaluesiftheconicalflaskwasnotdriedbeforerepeatingthetitration.
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[Total:8]
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2 Astudent investigatedthetemperaturechangeswhentwodifferentsolids,N and O,dissolveinwater.
Twoexperimentsweredone.
Experiment 1
● Usingameasuringcylinder,30cm3ofdistilledwaterwaspouredintoapolystyrenecup. ● Theinitialtemperatureofthedistilledwaterwasmeasured. ● Solid Nwasaddedto thedistilledwater,a timerstartedandthemixturewasstirredwitha
stirringthermometer. ● Thetemperatureofthemixturewasmeasuredevery30secondsforthreeminutes(180seconds).
(a) Usethethermometerdiagramstorecordthetemperaturesinthetable.
thermometerdiagram
time / s 0 30 60 90 120 150 180
temperature ofmixture / °C
25
20
15
25
20
15
25
20
15
30
25
20
30
25
20
30
25
20
30
25
20
[2]
Experiment 2
Experiment1wasrepeatedusinganewpolystyrenecupandsolidOinsteadofsolidN.
(b) Usethethermometerdiagramstorecordthetemperaturesinthetable.
thermometerdiagram
time / s 0 30 60 90 120 150 180
temperature ofmixture / °C
30
25
20
20
15
10
20
15
10
20
15
10
10
5
0
10
5
0
20
15
10
[2]
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0971/62/O/N/19© UCLES 2019 [Turn over
(c) PlottheresultsforExperiments1and2onthegrid.Drawtwosmoothlinegraphs. Clearlylabelyourgraphs.
30
20
10
00 30 60
time / s
temperatureof mixture/ °C
90 120 150 180 210 240
[3]
(d) (i) From your graph, deduce the time taken for the initial temperature of the solution inExperiment2tochangeby3°C.
Showclearlyon the gridhowyouworkedoutyouranswer.
..............................s[3]
(ii) ExtendyourgraphforExperiment1togivetheexpectedtemperatureofthemixtureafter240seconds.
..............................°C[2]
(e) IstheenergychangeinExperiment2exothermicorendothermic?Explainyouranswer.
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..............................................................................................................................................[1]
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(f) State two possible sources of error in these experiments. Suggest two improvements toreduceeachofthesesourcesoferror.
sourceoferror1........................................................................................................................
improvement1...........................................................................................................................
sourceoferror2........................................................................................................................
improvement2........................................................................................................................... [4]
[Total:17]
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3 Twosubstances,solidP and solid Q,wereanalysed.SolidPwascopper(II)nitrate. TestsweredoneonsolidP and solid Q.
tests on solid P
Completetheexpectedobservations.
(a) AflametestwasdoneonsolidP.
observations........................................................................................................................[1]
Solid PwasaddedtodistilledwaterandthemixtureshakentodissolvesolidPandformsolutionP.Solution Pwasdividedintothreeequalportionsintwotest‑tubesandoneboilingtube.
(b) An excess of aqueous sodium hydroxidewas added to the first portion of solutionP in a test‑tube.
observations........................................................................................................................[1]
(c) (i) A fewdropsofaqueousammoniawereadded to thesecondportionofsolutionP in a test‑tube.
observations.................................................................................................................[1]
(ii) Anexcessofaqueousammoniawasthenaddedtothismixture.
observations.................................................................................................................[2]
(d) AluminiumfoilandaqueoussodiumhydroxidewereaddedtothethirdportionofsolutionP in aboilingtube.Themixturewasheatedandthegasproducedtested.
observations..............................................................................................................................
..............................................................................................................................................[2]
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0971/62/O/N/19© UCLES 2019
tests on solid Q
Someofthetestsandobservationsareshown.
tests on solid Q observations
test 1
AflametestwasdoneonsolidQ. lilaccolour
test 2
Solid Qwasdissolvedinwater.
Dilutenitricacidandaqueoussilvernitratewereaddedtothesolution.
creamprecipitateformed
(e) IdentifysolidQ.
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[Total:9]
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4 Thetablegivessomeinformationaboutthepropertiesofthreesubstancesfoundinahandcream.
substance reactionwithdilutenitricacid
polystyrenebeads noreaction
calciumcarbonate reactsanddissolves
sodiumfluoride dissolves
Use the information in the table to plan an experiment to obtain a pure, dry sample of polystyrenebeadsfromthismixtureofsubstances.
Youareprovidedwithamixtureofthethreesubstancesandcommonlaboratoryapparatus.
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