RVHS 2023 Chem Sec 3 Paper 2 QP

River Valley High School Pg 1 of 16 Sec 3 RVIP Chemistry End-of-Year Examination 2023 RIVER VALLEY HIGH SCHOOL SEC 3 END-OF-YEAR EXAMINATION CHEMISTRY PAPER 2 9 OCTOBER 2023 1 HOUR 15 MINUTES NAME CLASS 3 INDEX NO. READ THESE INSTRUCTIONS FIRST DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Read these notes carefully. Write your name, class and index number in the spaces at the top of this page. 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. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. *Circle the question you attempted in the table on the right. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINERS’ USE ONLY Section A A1 / 4 A2 / 7 A3 / 11 A4 / 11 A5 / 12 Section B B6 (Either / Or)* / 10 TOTAL Statements Significant Figures Units PAPER 2 (60.4%) / 55 PAPER 1 (39.6%) / 30 / 100% This document consists of 16 printed pages.

River Valley High School Pg 2 of 16 Sec 3 RVIP Chemistry End-of-Year Examination 2023 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 45. A1 Table 1.1 shows some information about particles A to F. Table 1.1 Particle Number of protons Number of neutrons Number of electrons A 13 14 13 B 17 20 18 C 19 20 18 D 29 35 27 E 30 34 30 F 47 61 46 Use the letters A, B, C, D, E and F to answer the following questions. (a) Which two particles are atoms? ………………………………………………………………………..………..……… [1] (b) Which two particles have the same mass number? ………………………………………………………………………..………..……… [1] (c) Which two particles combine to form a white precipitate? ………………………………………………………………………..………..……… [1] (d) Which particle combine with hydroxide ion, OH–, to form a blue precipitate? ………………………………………………………………………..………..……… [1] [Total: 4]

River Valley High School Pg 3 of 16 Sec 3 RVIP Chemistry End-of-Year Examination 2023 A2 Recently, it was reported in the New York Times that in the hottest days of the summer, some airplanes were forced to be grounded by extreme heat as the high temperatures reduced the performance of the airplanes’ engines. When temperature increases, air density decreases . This means that the number of particles per unit volume decreases, which then reduces lift and makes it harder for airplanes to take off. Table 2.1 Box A Box B (a) Using ‘o’ to represent air particles, draw diagrams to show the arrangement of air particles at lower temperature and higher temperature in Box A and B