AS Chemistry - Edexcel

ASChemistrySample Assessment MaterialsPearson Edexcel Level 3 Advanced Subsidiary GCE in Chemistry (8CH0)First teaching from September 2015First certification from 2016Issue 1

PearsonEdexcel Level 3Advanced Subsidiary GCE inChemistry (8CH0)Sample Assessment MaterialsFirst certification 2016

Edexcel, BTEC and LCCI qualificationsEdexcel, BTEC and LCCI qualifications are awarded by Pearson, the UK’s largestawarding body offering academic and vocational qualifications that are globallyrecognised and benchmarked. For further information, please visit our qualificationwebsites at www.edexcel.com, www.btec.co.uk or www.lcci.org.uk. Alternatively, youcan get in touch with us using the details on our contact us page atqualifications.pearson.com/contactusAbout PearsonPearson is the world's leading learning company, with 40,000 employees in more than70 countries working to help people of all ages to make measurable progress in theirlives through learning. We put the learner at the centre of everything we do, becausewherever learning flourishes, so do people. Find out more about how we can help youand your learners at qualifications.pearson.comReferences to third party material made in these sample assessment materials aremade in good faith. Pearson does not endorse, approve or accept responsibilityfor the content of materials, which may be subject to change, or any opinionsexpressed therein. (Material may include textbooks, journals, magazines andother publications and websites.)All information in this document is correct at the time of publication.Original origami artwork: Mark BolithoOrigami photography: Pearson Education Ltd/Naki KouyioumtzisISBN 978 1 446 91449 6All the material in this publication is copyright Pearson Education Limited 2015

Contents1Introduction12General marking guidance33Paper 1 Core Inorganic and Physical Chemistry54Paper 1 Mark Scheme335Paper 2 Core Organic and Physical Chemistry536Paper 2 Mark Scheme77

IntroductionThe Pearson Edexcel Level 3 Advanced Subsidiary GCE in Chemistry is designed for use inschools and colleges. It is part of a suite of GCE qualifications offered by Pearson.These sample assessment materials have been developed to support this qualificationand will be used as the benchmark to develop the assessment students will take.Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 20151

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General marking guidance All candidates must receive the same treatment. Examiners must mark the lastcandidate in exactly the same way as they mark the first. Mark schemes should be applied positively. Candidates must be rewarded for whatthey have shown they can do rather than be penalised for omissions. Examiners should mark according to the mark scheme – not according to theirperception of where the grade boundaries may lie. All the marks on the mark scheme are designed to be awarded. Examiners shouldalways award full marks if deserved, i.e. if the answer matches the mark scheme.Examiners should also be prepared to award zero marks if the candidate’s responseis not worthy of credit according to the mark scheme. Where some judgement is required, mark schemes will provide the principles bywhich marks will be awarded and exemplification/indicative content will not beexhaustive. When examiners are in doubt regarding the application of the mark scheme to acandidate’s response, a senior examiner must be consulted before a mark is given. Crossed-out work should be marked unless the candidate has replaced it with analternative response.Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 20153

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Write your name hereSurnameOther namesPearson EdexcelLevel 3 GCECentre NumberCandidate NumberChemistryAdvanced SubsidiaryPaper 1: Core Inorganic and Physical ChemistrySample Assessment Materials for first teaching September 2015Time: 1 hour 30 minutesYou must have:Data BookletScientific calculator, rulerPaper Reference8CH0/01Total MarksInstructionsblack ink or ball-point pen. Usein the boxes at the top of this page with your name, Fillcentre number and candidate number.Answerall questions. Answer thein the spaces provided – there may bequestionsmore space than you need.Informationtotal mark for this paper is 80. Themarks for each question are shown in brackets The– use this as a guide as to how much time to spend on each question.You may use a scientific calculator. Forquestions marked with an *, marks will be awarded for your ability to structureyour answer logically showing the points that you make are related or follow on from each other where appropriate.A Periodic Table is printed on the back cover of this paper.Adviceeach question carefully before you start to answer it. Readto answer every question. TryCheckif you have time at the end. Show allyouryouranswersworking in calculations and include units where appropriate. S47551A 2015 Pearson Education Ltd.1/1/1/1/1/1/1/*s47551A0128*Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 2015Turn over5

Answer ALL questions.Write your answers in the spaces provided.Some questions must be answered with a cross in a box .If you change your mind about an answer, put a line through the boxand then mark your new answer with a cross .1 Many elements in the Periodic Table have different isotopes.(a) What is meant by the term isotopes, with reference to sub-atomic particles?(2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(b) A radioactive compound containing the phosphide ion, 32P3–, is used in thetreatment of skin cancer.What is the electronic configuration of the phosphide ion, 32P3 ?(1)A 1s22s22p63s2B 1s22s22p63s23p3C 1s22s22p63s23p6D 1s22s22p63s23p33d3(c) A sample of silicon contains 92.2% 28Si and 4.67% 29Si, the remainder being 30Si.Calculate the relative atomic mass of silicon in this sample, giving your answer toan appropriate number of significant figures.26*s47551A0228*(2)Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 2015

(d) Silicon tetrachloride, SiCl4, is a covalent substance which is a liquid at room temperature.Calculate the number of molecules in 5.67 g of SiCl4.(2)(Total for Question 1 7 marks)*s47551A0328*Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 201537Turn over

2 The molecules carbon dioxide, water and chloric(I) acid can be represented by thesestructures.O C OClOHOHHAll the bonds in these molecules are polar because the elements have differentelectronegativities.(a) In terms of atomic structure, give two reasons why oxygen is more electronegativethan carbon.(2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(b) Explain why carbon dioxide is the only non-polar molecule of the three.(2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48*s47551A0428*Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 2015

(c) The diagram shows the structure of a water molecule and of a chloric(I) acidmolecule.ClOHHOHDraw a diagram to show how a hydrogen bond can form between thetwo molecules.(2)(Total for Question 2 6 marks)*s47551A0528*Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 201559Turn over

3 Phosphorus(V) chloride, PCl5, is a pale yellow solid which sublimes when heated.Phosphorus(V) chloride may be prepared in the laboratory from dry phosphorus(III)chloride and dry chlorine, using the apparatus shown.anhydrous calciumchloride tubephosphorus(III) chloridedry chlorinephosphorus(V) chloride(a) Which statement gives a reason why phosphorus(V) chloride has a higher meltingtemperature than phosphorus(III) chloride?(1)A PCI5 contains phosphorus with a higher oxidation numberB PCI5 has stronger intermolecular forcesC PCI5 molecules have more covalent bondsD PCI5 molecules have stronger covalent bonds610*s47551A0628*Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials – Issue 1 – February 2015 Pearson Education Limited 2015