2024 RI H1Chem Prelims P2 Questions

RAFFLES INSTITUTION 2024 YEAR 6 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 8873/02 Paper 2 Structured Questions 10 September 2024 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write your name, class and index number in the spaces provided at the top of this page. Write in dark blue or black pen. You may use a n HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all the questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. Do not write anything in it. You are reminded of the need for good English and clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 23 printed pages and 1 blank page. For Examiner’s Use Section A 1 / 11 2 / 8 3 / 11 4 / 10 5 / 11 6 / 9 Section B (Please circle the question you have attempted) 7 / 20 8 / 20 Total / 80

2 © Raffles Institution 2024 8873/02/S/24 [Turn Over Section A Answer all the questions in this section in the spaces provided. 1 (a) Complete Table 1.1 for each species. Table 1.1 species number of protons number of neutrons number of electrons electronic configuration K19 40 1s2…………………………………... 24 28 21 1s2…………………………………... [3] (b) The strength of interaction between particles determines whether the substance is a solid, liquid or gas at room temperature. Magnesium oxide, MgO, is a solid while sulfur trioxide, SO 3, is a liquid at room temperature. (i) Explain in terms of structure and bonding, why MgO is a solid while SO3 is a liquid at room temperature. ……………………………………………………………………………………..………. ……………………………………………………………………………………..………. ……………………………………………………………………………………..…….… ……………………………………………………………………………………...……… ……………………………………………………………………………………..……[2] (ii) Suggest one other difference in the physical properties of MgO and SO3. ……………………………………………………………………………………..………. …………………………………………………………………………………..………[1]

3 © Raffles Institution 2024 8873/02/S/24 [Turn Over (iii) Draw a ‘dot -and-cross’ diagram to show the arrangement of outer electrons in MgO.