Compassvale Sec 4 Exp Prelim Chem P1 2025 QP

COMPASSVALE SECONDARY SCHOOL Secondary Four Express Preliminary Examination 2025 NAME CENTRE NUMBER S CLASS INDEX NUMBER ___________________________________________________________________________ CHEMISTRY 6092/01 Paper 1 Multiple Choice 25 August 2025 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your Centre number, class, index number and name on all the work you hand in. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are forty 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. A copy of the Periodic Table is printed on page 17. The use of an approved scientific calculator is expected, where appropriate. ___________________________________________________________________________ This document consists of 17 printed pages and 1 blank page. Set by: Mdm C Lim [Turn over

2 1 The table gives the density and solubility of four gases in water. gas density solubility in water 1 denser than air soluble 2 less dense than air soluble 3 denser than air insoluble 4 less dense than air insoluble Two methods of gas collection are upward delivery and displacement of water. Which row correctly shows whether each of these methods could be used to collect the gas? gas method of collection upward delivery displacement of water A 1 yes yes B 2 yes no C 3 yes no D 4 no yes 2 A student carried out an experiment to prepare a sample of aqueous potassium chloride. The equation for the reaction is shown. KOH(aq) + HCl(aq) → KCl(aq) + H2O(l) What pieces of apparatus are required for this experiment? A beaker, electronic balance, evaporating dish B burette, conical flask, pipette C conical flask, gas syringe, stopwatch D filter funnel, filter paper, measuring cylinder gas upward delivery displacement of water gas water

3 3 Substance X can be separated from its mixture using the apparatus as shown in the diagram. Which row gives the correct melting and boiling point of substance X? melting point / °C boiling point / °C A −218 −183 B −56 10 C −7 59 D 45 179 4 An inflated balloon deflates because gas molecules can diffuse through the rubber. Four balloons are filled with different gases at the same temperature and pressure. Which balloon would deflate most quickly? A B C D [Turn over substance X mixture water in water out carbon dioxide, CO2 methane, CH4 nitrogen, N2 oxygen, O2

4 5 Which row correctly describes changes in the particles when a substance freezes? arrangement of the particles energy change in the particles A less orderly gain energy B less orderly lose energy C more orderly gain energy D more orderly lose energy 6 The diagrams show the spacing of particles in a substance at two different temperatures. at −135 °C at −115 °C Which graph shows how the temperature of the substance changes with time when it is heated? A B C D temperature/°C time/min −140 −110 temperature/°C time/min −140 −120 temperature/°C time/min −130 −110 temperature/°C time/min −130 −120

5 7 A beam of particles contains neutrons, n, protons, p and electrons, e. The beam is passed between charged plates. Which diagram shows how the particles are affected by the plates? A B C D 8 Iridium has two isotopes. One of the isotope is iridium –191 which has a percentage abundance of 37.3%. The relative atomic mass of iridium is 192.2. What is the other isotope of iridium? A iridium–190 B iridium–192 C iridium–193 D iridium–194 9 Element Z which is in Group 16 of the Periodic Table has x neutrons and y protons. Which symbol represents the ion of Z? A Zyx 2+ B Zy x+y 2+ C Zyx 2− D Zy x+y 2− [Turn over beam of particles +ve -ve e n p beam of particles +ve -ve e n p beam of particles +ve -ve e n p beam of particles +ve -ve e n p

6 10 The ion QH4+ can be represented by the ‘dot–and–cross’ diagram shown. To which group in the Periodic Table does Q belong to? A Group 1 B Group 13 C Group 14 D Group 15 11 Which row shows the correct number of electrons used in covalent bonding in each molecule? ammonia carbon dioxide fluorine nitrogen A 6 4 2 4 B 6 8 2 6 C 6 4 2 6 D 6 8 2 4 12 Which statement best explains why potassium chloride has a lower melting point than calcium oxide? A Potassium chloride is a covalent compound but calcium oxide is an ionic compound. B Potassium is more reactive than calcium. C The forces of attraction between K+ and Cl– is weaker than that between Ca2+ and O2–. D The melting point of potassium is lower than that of calcium. 13 When green solid P is heated, black solid Q and colourless gas R is formed. When gas R is bubbled into limewater, white precipitate is formed. Which correctly describes P, Q and R? P Q R A compound mixture element B compound compound compound C element element compound D element compound element H H H H Q +

7 14 Potash alum is a salt that is made up of three different ions. The formula of the salt is KX(SO4)2, where X is an unknown ion. What is the formula for the nitrate of X? A XNO3 B X(NO3)2 C X(NO3)3 D X2NO3 15 The relative formula masses of four compounds are given. A student has 1.0 g samples of each compound. Which sample contains the highest number of oxygen atoms? compound relative formula mass A Al2O3 102 B CuO 80 C HNO3 63 D H2SO4 98 16 Oxides of nitrogen are pollutant gases which are emitted from car exhausts. 0.46 g of an oxide of nitrogen, NxOy, occupies 120 cm3 at room temperature and pressure. What are the values of x and y? x y A 1 1 B 1 2 C 2 1 D 2 4 17 Ammonia is manufactured from nitrogen and hydrogen by the Haber process. N2(g) + 3H2(g) ⇌ 2NH3(g) What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen? A 17.6% B 30.0% C 35.3% D 50.0% [Turn over

8 18 On heating, ammonium nitrate, NH4NO3, decomposes to form dinitrogen oxide and water. NH4NO3 → N2O + 2H2O When 85 g of an impure sample of ammonium nitrate is heated, 27 g of water is formed. What is the mass of ammonium nitrate in the impure sample? A 66 x 27 36 B 80 x 27 18 C 80 x 27 36 D 85 x 9 36 19 In an experiment, 4.0 cm3 of 1.0 mol/dm3 copper(II) sulfate solution is mixed with 8.0 cm3 of 1.0 mol/dm3 sodium carbonate solution. What does the reaction vessel now contain? A a colourless solution only B