OCR A Jun 2009 Paper 1 Q5

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The Periodic Table is a table of elements arranged in order of atomic number. The elements are classified into blocks. 10 (a) (i) State what is meant by the term atomic number.[1] (ii) Complete the full electron configuration for a titanium atom. 1s2[1] (iii) Identify the seventh element in the fourth period. State which block this element is in. elementblock[1] (b) The figure below shows the boiling points of four hydrides of Group 6 elements. 100 H2O boiling point / C H2Te H2Se H2S 100 (i) Explain, with the aid of a diagram, the intermolecular forces in H2O that lead to the relatively high boiling point of H2O.[3]OCR 2009<br /> (ii) Suggest why H2S has a much lower boiling point than H2O. 11[1] (c) The boiling points of some Group 7 elements are shown below. Group 7 element boiling point / C chlorine bromine iodine 35 59 184 Explain why the halogens show this trend in boiling points. In your answer, you should use appropriate technical terms, spelt correctly.[3] TURN OVER FOR QUESTION 5(d)OCR 2009 Turn over<br /> (d) During the extraction of bromine industrially, chlorine is bubbled through a solution of bromide ions. A student thought this principle would also work for extracting iodine and carried out the experiment below. 12 Stage 1 The student bubbled some chlorine through an aqueous solution of potassium iodide. Stage 2 The student added an organic solvent and shook the mixture. (i) What would the student see at stage 1?[1] (ii) Name the products and write an ionic equation for the reaction in stage 1. names of products:ionic equation:[2] (iii) Why does the reaction in stage 1 occur?[1] (iv) What would the student see at stage 2?[1] [Total: 15] END OF QUESTION PAPER Copyright Information OCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations, is given to all schools that receive assessment material and is freely available to download from our public website (www.ocr.org.uk) after the live examination series. If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity. For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1PB. OCR 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.OCR 2009<br />

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