JPJC 2022 JC1 promos P2_Suggested Answer

 Jurong Pioneer Junior College [Turn Over JURONG PIONEER JUNIOR COLLEGE 2022 JC1 YEAR END EXAMINATION Higher 2 CANDIDATE NAME CLASS 2 2 S EXAM INDEX CHEMISTRY 9729/02 Paper 2 Structured and Free Response Questions 28 September 2022 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, class and exam index number on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a HB pencil for any diagrams, graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in Section A (55 marks) and in Section B (20 marks) in the spaces provided on the Question paper. For Section B, if additional space is required, you should use the pages at the end of this booklet. The question number must be clearly shown. 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. For Examiner’s Use Section A 1 7 2 13 3 8 4 14 5 13 Section B 6 20 Penalty (delete accordingly) Lack 3sf in final answer –1 / NA Missing/wrong units in final answer –1 / NA Total 75 This document consists of 19 printed pages and 3 blank pages.

2  Jurong Pioneer Junior College 9729/02/J1 YEAR END EXAM/2022 Section A (55 marks) Answer ALL the questions in the spaces provided. 1 Atoms contain the subatomic particles – electrons, protons and neutrons. Protons and electrons were discovered by observations of their behaviours in electric field. For Examiner’s Use (a) Fig. 1.1 Fig. 1.1 shows the behaviour of separate beams of protons and neutrons in an electric field. (i) Complete the diagram in Fig. 1.1 with the relative charge of each of the electrically charged plates. [1] (ii) In Fig. 1.1, show how a separate beam of electrons from the same source behaves in the same electric field. [1] (iii) If the particles are all travelling at the same speed, through an electric field of constant strength, the angle of deflection is proportional to their charge/mass ratio. In this particular experimental set-up, protons are deflected through an angle of +15. Assuming an identical set of experimental conditions, calculate the angle of deflection for 4He2+. charge mass angle of deflection proton 1+ 1 +15 4He2+ 2+ 1+ 4 2 ½  (+15) = +7.50 (sign + 3sf + units) [1] charge on plate …………………… negative electrons protons charge on plate …………………… source neutrons positive  deflects more in the opposite direction relative to proton  parabolic only within electric field (width of plate)

3  Jurong Pioneer Junior College 9729/02/J1 YEAR END EXAM/2022 [Turn Over Under identical conditions, a beam of p