AS Chemistry - Edexcel

1 AS ChemistrySample Assessment MaterialsPearson Edexcel Level 3 Advanced Subsidiary GCE in Chemistry (8CH0)First teaching from September 2015 First certifi cation from 2016 Issue 1 PearsonEdexcel Level 3 Advanced Subsidiary GCE in Chemistry (8CH0) Sample Assessment Materials First certification 2016 Edexcel , BTEC and LCCI qualifications Edexcel , BTEC and LCCI qualifications are awarded by Pearson, the UK s largest awarding body offering academic and vocational qualifications that are globally recognised and benchmarked. For further information, please visit our qualification websites at , or Alternatively, you can get in touch with us using the details on our contact us page at About Pearson Pearson is the world's leading learning company, with 40,000 employees in more than 70 countries working to help people of all ages to make measurable progress in their lives through learning. We put the learner at the centre of everything we do, because wherever learning flourishes, so do people.

2 Find out more about how we can help you and your learners at References to third party material made in these sample assessment materials are made in good faith. Pearson does not endorse, approve or accept responsibility for the content of materials, which may be subject to change, or any opinions expressed therein. (Material may include textbooks, journals, magazines and other publications and websites.) All information in this document is correct at the time of publication. Original origami artwork: Mark Bolitho Origami photography: Pearson Education Ltd/Naki Kouyioumtzis ISBN 978 1 446 91449 6 All the material in this publication is copyright Pearson Education Limited 2015 Contents1 Introduction 12 General marking guidance 33 Paper 1 Core Inorganic and Physical Chemistry 54 Paper 1 Mark Scheme 335 Paper 2 Core Organic and Physical Chemistry 536 Paper 2 Mark Scheme 77 Introduction The Pearson Edexcel Level 3 Advanced Subsidiary GCE in Chemistry is designed for use in schools and colleges.

3 It is part of a suite of GCE qualifications offered by Pearson. These sample assessment materials have been developed to support this qualification and 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 Introduction The Pearson Edexcel Level 3 Advanced Subsidiary GCE in Chemistry is designed for use in schools and colleges. It is part of a suite of GCE qualifications offered by Pearson. These sample assessment materials have been developed to support this qualification and 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 20152 General marking guidance All candidates must receive the same treatment.

4 Examiners must mark the last candidate in exactly the same way as they mark the first. Mark schemes should be applied positively. Candidates must be rewarded for what they have shown they can do rather than be penalised for omissions. Examiners should mark according to the mark scheme not according to their perception of where the grade boundaries may lie. All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate s response is not worthy of credit according to the mark scheme. Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification/indicative content will not be exhaustive. When examiners are in doubt regarding the application of the mark scheme to a candidate s response, a senior examiner must be consulted before a mark is given.

5 Crossed-out work should be marked unless the candidate has replaced it with an alternative response. Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 20153 General marking guidance All candidates must receive the same treatment. Examiners must mark the last candidate in exactly the same way as they mark the first. Mark schemes should be applied positively. Candidates must be rewarded for what they have shown they can do rather than be penalised for omissions. Examiners should mark according to the mark scheme not according to their perception of where the grade boundaries may lie. All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate s response is not worthy of credit according to the mark scheme.

6 Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification/indicative content will not be exhaustive. When examiners are in doubt regarding the application of the mark scheme to a candidate 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 an alternative response. Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 20154 Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 20155 Centre NumberCandidate NumberWrite your name hereSurnameOther namesTotal MarksPaper ReferenceTurn over S47551A 2015 Pearson Education *s47551A0128*ChemistryAdvanced SubsidiaryPaper 1: Core Inorganic and Physical ChemistrySample Assessment Materials for first teaching September 2015 Time: 1 hour 30 minutes8CH0/01 You must have: Data BookletScientific calculator, rulerInstructions Use black ink or ball-point pen.

7 Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions. Answer the questions in the spaces provided there may be more space than you The total mark for this paper is 80. The marks for each question are shown in brackets use this as a guide as to how much time to spend on each question. You may use a scientific calculator. For questions marked with an *, marks will be awarded for your ability to structure your 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 Read each question carefully before you start to answer it. Try to answer every question. Check your answers if you have time at the end. Show all your working in calculations and include units where Edexcel Level 3 GCEP earson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 201562*s47551A0228*Answer ALL questions.

8 Write your answers in the spaces questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and 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 the treatment of skin cancer. What is the electronic configuration of the phosphide ion, 32P3 ?(1) A 1s22s22p63s2 B 1s22s22p63s23p3 C 1s22s22p63s23p6 D 1s22s22p63s23p33d3 (c) A sample of silicon contains 28Si and 29Si, the remainder being 30Si. Calculate the relative atomic mass of silicon in this sample, giving your answer to an appropriate number of significant figures.(2)Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 201573*s47551A0328*Turn over (d) Silicon tetrachloride, SiCl4, is a covalent substance which is a liquid at room temperature.

9 Calculate the number of molecules in g of SiCl4.(2)(Total for Question 1 = 7 marks)Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 201584*s47551A0428*2 The molecules carbon dioxide, water and chloric(I) acid can be represented by these All the bonds in these molecules are polar because the elements have different electronegativities. (a) In terms of atomic structure, give two reasons why oxygen is more electronegative than carbon.(2).. (b) Explain why carbon dioxide is the only non-polar molecule of the three.(2)..Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 201595*s47551A0528*Turn over (c) The diagram shows the structure of a water molecule and of a chloric(I) acid Draw a diagram to show how a hydrogen bond can form between the two molecules.

10 (2)(Total for Question 2 = 6 marks)Pearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 2015106*s47551A0628*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 calcium chloride tubephosphorus(V) chloridephosphorus(III) chloridedry chlorine (a) Which statement gives a reason why phosphorus(V) chloride has a higher melting temperature than phosphorus(III) chloride?(1) A PCI5 contains phosphorus with a higher oxidation number B PCI5 has stronger intermolecular forces C PCI5 molecules have more covalent bonds D PCI5 molecules have stronger covalent bondsPearson Edexcel Level 3 Advanced Subsidiary GCE in ChemistrySample Assessment Materials Issue 1 February 2015 Pearson Education Limited 2015117*s47551A0728*Turn over (b) (i) Explain an essential safety precaution for this preparation.