2024 RI H1Chem Prelims P1 Questions

RAFFLES INSTITUTION 2024 YEAR 6 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873 / 01 Paper 1 Multiple Choice 19 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty questions in this section. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in the question booklet. The use of an approved scientific calculator is expected where appropriate. This document consists of 12 printed pages.

2 © Raffles Institution 2024 8873/01/S/24 [Turn Over For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Which statement about one mole of ethanal, CH3CHO, is correct? A It contains 6.02 x 1023 atoms. B It contains 6.02 x 1023 carbon atoms. C It contains 1.81 x 1024 hydrogen atoms. D It contains 6.02 x 1023 molecules. 2 The charge on an electron is −1.60 x 10–19 coulombs. Aluminium reacts with fluorine to form aluminium fluoride, AlF3. Calculate the charge removed from one mole of aluminium atoms as they form one mole of aluminium fluoride, AlF3. A −2.89 x 105 C C −4.80 x 10−19 C B −9.63 x 104 C D −1.81 x 1024 C 3 The manganate(VII) ion, MnO 4−, is a strong oxidi sing agent in acidic solution. It oxidises iodide ions, copper(I) ions and sulfite ions, SO32−. The relevant half-equations are given. MnO4− + 8H+ + 5e− ⇌ Mn2+ + 4H2O I2 + 2e– ⇌ 2I− Cu2+ + e– ⇌ Cu+ SO42− + 2H+ + 2e− ⇌ SO32− + H2O Which statements about the reactions of 1 mole of MnO4−(aq) are correct? 1 It reacts with 5 moles of copper(I) ions, producing 5 moles of copper(II) ions. 2 It reacts with an excess of iodide ions, producing 5 moles of iodine molecules. 3 It reacts with 2.5 moles of sulfate ions, producing 2.5 moles of sulfite ions. A 1 only C 1 and 3 only B 1 and 2 only D 1, 2 and 3

3 © Raffles Institution 2024 8873/01/S/24 [Turn Over 4 Use of the Data Booklet is relevant to this quest