2024 H1 Prelim Paper 2_HCI

This document consists of 20 printed pages and 0 blank page. © Hwa Chong Institution 8873/02/Prelim 2024 [Turn over HWA CHONG INSTITUTION C2 Preliminary Examination Higher 1 CANDIDATE NAME CT GROUP 23S CENTRE NUMBER INDEX NUMBER CHEMISTRY Paper 2 Structured Questions Candidates answer on the Question Paper Additional Materials: Data Booklet 8873/02 11 September 2024 2 hours READ THESE INSTRUCTIONS FIRST Write in dark blue or black pen. You may use a 2B pencil for any diagrams or graphs. Do not use staples, paper clips, glue, correction fluid or tapes. Section A Answer all the questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. FOR EXAMINERS’ USE ONLY Number of additional writing paper(s) submitted Paper 2 Section A 1 / 14 2 / 17 3 / 10 4 / 19 Paper 2 Section B 5 or 6 / 20 Paper 2 / 80 Paper 1 / 30 Total / 100

2 © Hwa Chong Institution 8873/02/Prelim 2024 [Turn over Section A Answer all the questions in this section in the spaces provided. 1 Use of Data Booklet is relevant to this question. Tellurium is an element with an electronic configuration of [Kr] 4d10 5s2 5p4. The most common isotope of tellurium is 130Te. (a) Complete Table 1.1. Table 1.1 number of neutrons number of electrons 130Te [1] (b) Describe how the behaviour of beams of 130Te+ ion, 130Te atom and the electron, e−, differ in an electric field. ………………………………………………………………………………………………..…..... ………………………………………………………………………………………………..…..... ………………………………………………………………………………………………..…..... ………………………………………………………………………………………………..…..... ………………………………………………………………………………………………..…..... ……………………………………………………………………….………………............… [2] (c) (i) Write an equation to represent the first ionisation energy of Te. ……………………………………………………………………….………………...… [1] (ii) State and explain the general trend in first ionisation energy across period 3. …………………………………………………………………………..…………………... ………………………………………………………………………..……………………... ………………………………………………………………………..……………………... ……………………………………………………………………….………………...… [2] (iii) Suggest why tellurium may not follow the general trend in (c)(ii). ………………………………………………………………………..……………………... ……………………………………………………………………….………………...… [1]

3 © Hwa Chong Institution 8873/02/Prelim 2024 [Turn over (d) (i) Sketch a graph in Fig. 1.1 to show the trend in the first seven ionisation energies of Te. Fig. 1.1 [2] (ii) Explain why the radius of Te ions decreases after each successive ionisation. ………………………………………………………………………..……………………... ……………………………………………………………………….………………...… [1] (e) Te reacts with F2 at 150 °C to form TeF6. Molecules of TeF6 are octahedral. Using the Valence Shell Electron Pair Repulsi