2024 DHS Y6 H1 Prelim Paper 1_QP

© DHS 2024 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 20 September 2024 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 15 printed pages and 1 blank page.

2 © DHS 2024 8873/01 1 Which diagram shows the correct arrangement of valence electrons of a S+ ion in the ground state? A 3s 3p 3s 3p 3s 3p 3s 3p B 3s 3p 3s 3p 3s 3p 3s 3p C 3s 3p 3s 3p 3s 3p 3s 3p D 3s 3p 3s 3p 3s 3p 3s 3p 2 The mineral pyrite only contains isotopes of sulfur and iron. A sample of pyrite was analysed and four different types of atom were identified: V, W, X and Y. atom relative mass relative % abundance V 32 63.8 W 34 2.8 X 54 31.4 Y 56 2.0 Which statements are correct? 1 Y2+ is isoelectronic with X. 2 Y has 14 more neutrons than V. 3 The relative atomic mass of iron in this sample is 54.1. 4 V2+ is deflected more than W2+ in the same electric field. A 1, 2, 3 and 4 B 2, 3 and 4 only C 2 and 3 only D 1 and 4 only

3 © DHS 2024 8873/01 [Turn over 3 Which row about the similarity and difference between a 2px and a 3pz orbital is correct? similarity difference A number of lobes per orbital orientation of orbital in space B size of orbital shape of orbital C orientation of orbital in space size of orbital D shape of orbital number of lobes per orbital 4 Use of the Data Booklet is relevant to this question. What is the order of decreasing enthalpy change for the reactions shown? Si+(g) → Si2+(g) + e− H1 Al+(g) → Al2+(g) + e− H2 Si(g) → Si2+(g) + 2e− H3 A H1 > H2 > H3 B H2 > H3 > H1 C H3 > H1 > H2 D H3 > H2 > H1 5 Which statement helps to explain why iodine has a larger atomic radius than chlorine? A Iodine is less electronegative than chlorine. B Iodine has more filled electron shells than chlorine. C Iodine has a greater number of protons than chlorine. D Iodine is a solid while chlorine is a gas under room conditions.

4 © DHS 2024 8873/01 6 Use of the Data Booklet is relevant to this qu