TJC_H1_CHEM_P2_(A)_QN

2015 TJC H1 Chemistry Preliminary Exam s CANDIDATE NAME CIVICS GROUP / CENTER NUMBER S INDEX NUMBER CHEMISTRY 8872/02 Paper 2 1 September 2015 2 hours Candidates answer section A on the Question Paper. Additional Materials: Answer Paper, Graph Paper Data Booklet READ THESE INSTRUCTIONS FIRST Write your Civics Group, centre number, index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Section B Answer two questions on separate answer paper. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 16 printed pages. For Examiner’s Use A1 / 10 A2 / 10 A3 / 10 A4 / 10 Section B / 40 Paper 1 / 30 Total PRELIMINARY EXAMINATIONS HIGHER 1

2 2015 TJC H1 Chemistry Preliminary Exam [Turn over For examiner’s use 1 (a) An acidified solution of KC lO2 oxidises Fe2+(aq) to Fe 3+(aq). When 0.150 g of KC lO2 reacted with 0.500 mol dm -3 Fe2+(aq) in the presence of H +(aq), 11.30 cm 3 of Fe 2+(aq) was needed for complete reaction. (i) Suggest the final oxidation state of chlorine after complete reaction. Show your workings clearly. (ii) State the full electronic configuration of Fe3+. [4]

3 2015 TJC H1 Chemistry Preliminary Exam [Turn over For examiner’s use (b) The research student was given the second ionisation energies of seven consecutive elements in the Periodic Table as shown below: (i) Define, with the aid of an equation, what is meant by second ionisation energy of element B. (ii) With reference to the graph above, deduce the Group of the Periodic Table to which B is likely to belong. Explain your answer. [4] Second ionisation energy /kJ mol-1 B C D E F G H       

4 2015 TJC H1 Chemistry Preliminary Exam [Turn over For examiner’s use (c) When the student passed a beam of protons through an electric field, it deflected 12° towards the negative plate. Under identical conditions, the student passed a beam of doubly charged particles J through the electric field. The angle of deflection was found to be 1.5° towards the positive plate. Identify the ion J.