XMS G3 Sec 3 Pure Chemistry WA1 2026

This document consists of 11 printed pages. Weighted Assessment 1 2026 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Secondary 3 G3 Setter: Mrs Estella Yeo Vetter: Ms Una Hsu K324 Term 1 Week 8 40 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A: Multiple Choice Questions (5 marks) 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 the boxes at the end of the Section. 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. Section B: Structured Questions (10 marks) Section C: Free Response Questions (15 marks) Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A 5 Section B 10 Section C 15 Total 30 Parent’s Signature

2 XMSS/Chemistry/K324/WA1 2026 The Periodic Table of Elements Group 1 2 13 14 15 16 17 18 Key 1 H hydrogen 1 2 He helium 4 3 Li lithium 7 4 Be beryllium 9 proton (atomic) number atomic symbol name relative atomic mass 5 B boron 11 6 C carbon 12 7 N nitrogen 14 8 O oxygen 16 9 F fluorine 19 10 Ne neon 20 11 Na sodium 23 12 Mg magnesium 24 3 4 5 6 7 8 9 10 11 12 13 Al aluminium 27 14 Si silicon 28 15 P phosphorus 31 16 S sulfur 32 17 Cl chlorine 35.5 18 Ar argon 40 19 K potassium 39 20 Ca calcium 40 21 Sc scandium 45 22 Ti titanium 48 23 V vanadium 51 24 Cr chromium 52 25 Mn manganese 55 26 Fe iron 56 27 Co cobalt 59 28 Ni nickel 59 29 Cu copper 64 30 Zn zinc 65 31 Ga gallium 70 32 Ge germanium 73 33 As arsenic 75 34 Se selenium 79 35 Br bromine 80 36 Kr krypton 84 37 Rb rubidium 85 38 Sr strontium 88 39 Y yttrium 89 40 Zr zirconium 91 41 Nb niobium 93 42 Mo molybdenum 96 43 Tc technetium – 44 Ru ruthenium 101 45 Rh rhodium 103 46 Pd palladium 106 47 Ag silver 108 48 Cd cadmium 112 49 In indium 115 50 Sn tin 119 51 Sb antimony 122 52 Te tellurium 128 53 I iodine 127 54 Xe xenon 131 55 Cs caesium 133 56 Ba barium 137 57–71 lanthanoids 72 Hf hafnium 178 73 Ta tantalum 181 74 W tungsten 184 75 Re rhenium 186 76 Os osmium 190 77 Ir iridium 192 78 Pt platinum 195 79 Au gold 197 80 Hg mercury 201 81 Tl thallium 204 82 Pb lead 207 83 Bi bismuth 209 84 Po polonium – 85 At astatine – 86 Rn radon – 87 Fr francium – 88 Ra radium – 89–103 actinoids 104 Rf rutherfordium – 105 Db dubnium – 106 Sg seaborgium – 107 Bh bohrium – 108 Hs hassium – 109 Mt meitnerium – 110 Ds darmstadtium – 111 Rg roentgenium – 112 Cn copernicium – 113 Nh nihonium – 114 Fl flerovium – 115 Mc moscovium – 116 Lv livermorium – 117 Ts tennessine – 118 Og oganesson – lanthanoids 57 La lanthanum 139 58 Ce cerium 140 59 Pr praseodymium 141 60 Nd neodymium 144 61 Pm promethium – 62 Sm samarium 150 63 Eu europium 152 64 Gd gadolinium 157 65 Tb terbium 159 66 Dy dysprosium 163 67 Ho holmium 165 68 Er erbium 167 69 Tm thulium 169 70 Yb ytterbium 173 71 Lu lutetium 175 actinoids 89 Ac actinium – 90 Th thorium 232 91 Pa protactinium 231 92 U uranium 238 93 Np neptunium – 94 Pu plutonium – 95 Am americium – 96 Cm curium – 97 Bk berkelium – 98 Cf californium – 99 Es einsteinium – 100 Fm fermium – 101 Md mendelevium – 102 No nobelium – 103 Lr lawrencium – The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.). The Avogadro constant, L = 6.02 x 1023 mol-1

3 XMSS/Chemistry/K324/WA1 2026 Section A [5 marks] Answer all questions. Write your answers in the boxes provided at the end of the section. 1 The graph shows the temperature of a solid as it is heated. Which letter corresponds to the correct change of state? A freezing B vaporisation C condensation D melting 2 Which statement about evaporation and boiling is not true? A Both evaporation and boiling involve the gain of energy by particles. B Evaporation is a slow process while boiling is a rapid process. C Evaporation occurs at the surface of the liquid while boiling occurs throughout the liquid. D Evaporation only occurs at room temperature, while boiling only occurs at the boiling point. temperature/ oC time/ min A C B D

4 XMSS/Chemistry/K324/WA1 2026 3 A beam of particles contains neutrons(n), protons(p) and electrons(e). The beam is passed between two charged plates. Which diagram shows how the particles are affected by the plates? 4 A student compared these four particles, Mg2+, Ne, O2− and Al 3+. Which conclusion about these four particles is correct? A They are isotopes of each other. B They have different number of electron shells. C They have the same number of electrons. D They have the same number of neutrons. 5 An ion, X2+, has 10 electrons and 14 neutrons. What is the mass number of X? A 12 B 16 C 22 D 26 Question 1 2 3 4 5 Answer A C B D

5 XMSS/Chemistry/K324/WA1 2026 Section B [10 marks] Answer all questions. Write your answers in the spaces provided. 6 Fig. 6.1 shows an experimental set -up consisting of two beakers, each containing a different gas, inverted over a porous pot containing air. The main component in air is nitrogen gas (N2). Fig. 6.1 Alice carried out two experiments using different gases, as shown in Table 6.1. Table 6.1 experiment gas 1 gas 2 water level at U increases remains the same decreases 1 carbon dioxide (CO2) propane (C3H8) 2 carbon dioxide (CO2) ammonia (NH3) (a) Put a tick () in one box in each row of Table 6.1 to indicate how the water level at U will change. [2] (b) Explain your answer in (a) for experiment 2. ………………………………………………………………………………………..……... ………………………………………………………………………………………………. ………………………………………………………………………………………………. [2] [Total: 4] U

6 XMSS/Chemistry/K324/WA1 2026 7 Air can be separated into different gases using the steps listed below. Step 1 Air is passed through a membrane to remove dust. Step 2 The air is cooled in stages until it reaches –200 ºC. Step 3 The cooled air is heated up and the gases are separated using fractional distillation. The melting and boiling points of the various gases in air are shown in Table 7.1. Table 7.1 gas melting point/ ºC boiling point/ ºC nitrogen –210 –196 oxygen –219 –183 argon –189 –186 carbon dioxide sublimes at –79 (a) Using Table 7.1, name two gases that will be in the solid state in step 2. ………………………………… and ………………………………… [1] (b) In the box below, draw a particle diagram to represent nitrogen gas at –