2025 DHS H1 Chem Prelim Paper 1 QP

© DHS 2025 8873/01 [Turn over Name: Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H1 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 8873/01 25 September 2025 1 hour READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty questions on 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 this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 11 printed pages and 1 blank page.

2 © DHS 2025 8873/01 1 Use of the Data Booklet is relevant to this question A 5 g sample of a diatomic gas was found to contain 3.76  1022 atoms. What is the relative molecular mass of this gas? A 40 B 80 C 120 D 160 2 In two separate experiments, a beam of alpha particles ( 4He2+) and a beam of charged particles X were fired with equal velocities into an electric field. + _ beam of particles The angle of deflection of the charged particles, 4He2+ and X, was found to be +1  and +6 respectively. Which statement is correct? A X is negatively charged. B X travels in a straight path towards one of the charged plates. C X could be a 12C+ ion. D None of the above. 3 Use of the Data Booklet is relevant to this question. Which of the following electronic configurations represents an element that forms a simple ion with a charge of –3? A 1s22s22p63s23p1 B 1s22s22p63s23p3 C 1s22s22p63s23p63d14s2 D 1s22s22p63s23p63d74s2

3 © DHS 2025 8873/01 [Turn over 4 Use of the Data Booklet is relevant to this question. W is an isotope of an element. An isotope of strontium has a nucleon number of 84 and the same number of neutrons in the nucleus as the isotope W. The species Sr2+ and W contain the same number of electrons. What is the nucleon number of W? A 80 B 82 C 83 D 84 5 Use of the Data Booklet is relevant to this question. Which particle contains a single unpaired electron? A Cr atom B Cu+ ion C H2S molecule D NO2 molecule 6 The molecules O=C=O, S=C=S and O=C=S are all linear. Which statements are correct? 1 The molecules all contain polar covalent bonds. 2 Only O=C=S has permanent dipole–permanent dipole interactions. 3 O=C=S has stronger instantaneous dipole–induced dipole interactions than S=C=S. A 1 and 2 only B 1 and 3 only