2024 Prelims RI H2 Chem P1 (QP)

© Raffles Institution 2024 9729/01/S/24 [Turn Over RAFFLES INSTITUTION 2024 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 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, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. There are thirty questions in this paper. 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 15 printed pages and 1 blank page.

© Raffles Institution 2024 9729/01/S/24 [Turn Over 2 1 Use of the Data Booklet is relevant to this question. How many molecules are present in 1 cm3 of methane gas under room temperature and pressure? A 6.02 × 1023 24000 B 6.02 × 1023 22400 C 22400 6.02 × 1023 D 24000 6.02 × 1023 2 When 20 cm3 of a gaseous hydrocarbon was completely burnt in 130 cm 3 of oxygen in an enclosed vessel, the volume of gas remaining after the reaction was 100 cm 3. This volume was decreased to 40 cm3 under the same conditions when the resulting mixture was passed through aqueous sodium hydroxide. All gas volumes are measured at room temperature and pressure. What is the formula of the hydrocarbon? A C2H2 B C3H6 C C3H8 D C4H10 3 What do the ions 18O2− and 19F− have in common? A They have more electrons than neutrons. B They have 10 neutrons in their nuclei. C They have an outer electronic configuration of 3s2 3p6. D They contain the same number of nucleons in their nuclei. 4 In beta−minus decay, a neutron in the nucleus of an atom is converted into a proton and a beta particle (electron). This increases the atomic number by 1 while the mass number remains unchanged. Thorium−234, Th90 234 , undergoes beta−minus decay. What is the resulting species after the decay process? A Ac89 234 B Pa91 233 + C Pa91 234 D Th90 235 −

© Raffles Institution 2024 9729/01/S/24 [Turn Over 3 5 Water has a higher boiling point than hydrogen fluoride. What is the major reason for this? A The O−H bond in water is stronger than the F−H bond in hydrogen fluoride. B A water molecule contains more electrons than a hydrogen fluoride molecule. C On average, there are more hydrogen bonds between water molecules than there are between hydrogen fluoride molecules.