CHEMISTRY
SRJC_H2_CHEM_P2.pdf

SRJC_H2_CHEM_P2.pdf - 1 SERANGOON JUNIOR COLLEGE General...

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SRJC 9729 / 02 / JC2 Prelim / 2017 SERANGOON JUNIOR COLLEGE General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CLASS CHEMISTRY 9729/02 JC2 Preliminary Examination 13 Sept 2017 Paper 2 Structured Questions 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST 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. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. At the end of the examination, fasten all your work securely together. The number of marks is given in the brackets [ ] at the end of each question or part questions. This document consists of 24 printed pages For Examiner’s Use 1 / 8 2 / 18 3 / 25 4 / 24 TOTAL / 75
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2 SRJC 9729 / 02 / JC2 Prelim / 2017 1 The size of an atom can be measured using the distance between the nuclei of two atoms. For example, the ‘metallic radius’ of the Na atom is half the distance between two Na atoms in the crystal lattice of the metal. The ‘covalent radius’ of the C l atom is taken to be half the distance between the nuclei in a C l 2 molecule. Finally, the ‘van der Waals’ radius’ of the A r atom is assumed to be half the distance between two atoms in the solid state. These three types of radius are commonly known as ‘atomic radii’ and the corresponding values for Period 3 elements can be found in the Data Booklet. (a) (i) Explain the general trend in atomic radius across Period 3. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [2] (ii) Suggest a reason for the anomaly in the measurement of atomic radius for argon. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [1] (b) (i) State the general relationship between atomic radius and first ionisation energy across Period 3. ……………………………………………………………………………………………….. ………………………………………………………………………………………………..
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  • Summer '15
  • Chemistry, Diethyl ether, Grignard reaction, Octane rating, SRJC

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