OCR A Jun 2014 Paper 1 Q5

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PMT The Periodic Table is arranged in periods and groups. (a) Elements in the Periodic Table show a periodic trend in atomic radius. State and explain the trend in atomic radius from Li to F. In your answer you should use appropriate technical terms, spelled correctly. trendexplanation[3] (b) (i) Complete the electron configuration of a bromide ion. 1s2[1] (ii) A student adds a small volume of aqueous silver nitrate to an aqueous solution of bromide ions in a test-tube. The student then adds a similar volume of dilute aqueous ammonia to the same test-tube. Describe what the student would see in the test-tube after the addition of aqueous ammonia.[1] (iii) Write an ionic equation for any precipitation reaction which occurs in the students tests. Include state symbols.[1]OCR 2014<br />
 PMT (c) The Group 7 element chlorine reacts with sodium hydroxide, NaOH, under different conditions to give different products. (i) Chlorine reacts with aqueous sodium hydroxide to form bleach. Write the equation and state the conditions for this reaction. equationconditions[2] (ii) Under different conditions, chlorine reacts differently with aqueous sodium hydroxide. A disproportionation reaction takes place as shown below. 3Cl2(g) + 6NaOH(aq) 5NaCl (aq) + NaCl O3(aq) + 3H2O(l) State what is meant by disproportionation and show that disproportionation has taken place in this reaction. Use oxidation numbers in your answer.[3] [Total: 11]OCR 2014 Turn over<br />

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