AQA-CHEM-W-SQP-2H - Specimen Paper Centre Number For Examiners Use Candidate Number Surname Other Names Examiners Initials Candidate Signature General

AQA-CHEM-W-SQP-2H - Specimen Paper Centre Number For...

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GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Specimen Paper Centre Number Candidate Number Surname Other Names Candidate Signature General Certificate of Secondary Education Higher Tier Additional Science Chemistry 2H Unit Chemistry C2 Chemistry Unit Chemistry C2 For this paper you must have: a ruler the Data Sheet (as an insert). You may use a calculator. Time allowed ! 60 minutes Instructions ! Use black ink or black ball-point pen. ! Fill in the boxes at the top of this page. ! Answer all questions. ! You must answer the questions in the space provided. Do not write outside the box around each page or on blank pages. ! Do all rough work in this book. Cross through any work you do not want to be marked. Information ! The marks for questions are shown in brackets. ! The maximum mark for this paper is 60. ! You are expected to use a calculator where appropriate. ! Question 3(a) should be answered in continuous prose. In this question you will be marked on your ability to: – use good English – organise information clearly – use specialist vocabulary where appropriate. Advice In all calculations, show clearly how you work out your answer. For Examiner’s Use Examiner’s Initials Question Mark 1 2 3 4 5 6 7 8 9 TOTAL H
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2 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Do not write outside the box Answer all questions in the spaces provided. 1 A student investigated the rate of reaction between marble and hydrochloric acid. The student used an excess of marble. The reaction can be represented by this equation: CaCO 3 (s) + 2HCl(aq) CaCl 2 (aq) + H 2 O(l) + CO 2 (g) The student used the apparatus shown in the diagram. The student measured the mass of the flask and contents for ten minutes. The results are shown on the graph. Use the graph to answer the questions.
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3 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Turn over ! Do not write outside the box 1 (a) (i) Complete the graph by drawing a line of best fit. (1 mark) 1 (a) (ii) Use the graph to find the mass of the flask and contents after 1.8 minutes. ......................................... grams (1 mark) 1 (a) (iii) The rate of reaction can be measured by the steepness of the graph line. Describe, as fully as you can, how the rate of reaction changes with time in this experiment. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (2 marks) 1 (b) The mass of the flask and contents decreased during the experiment. Use the equation for this reaction to help you explain why. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ( 2 marks ) Question 1 continues on the next page
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4 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Do not write outside the box 1 (c) A balance is used to measure the mass of the apparatus.
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