2022 BSS Chem Prelims P1

1 6092/1/9/22 [Turn over Name Class Index Number BROADRICK SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2022 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 Sept 2022 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paperclips, highlighters, glue or correction fluid. Write your name, class and register number on top of this page and on any separate answer paper used. 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 15. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages including this cover page. Setter : MR. LIANG ZW ��

2 6092/1/9/22 1 In a titration, 25.0 cm3 of aqueous sodium hydroxide is transferred into a conical flask. A few drops of indicator are added. Dilute hydrochloric acid is then added to the flask until the end-point is reached. Which pieces of apparatus are used to measure volume in this experiment? to measure dilute hydrochloric acid to measure aqueous sodium hydroxide A burette beaker B burette pipette C pipette pipette D pipette beaker 2 Which gas is not obtained industrially by fractional distillation? A ammonia B argon C nitrogen D oxygen 3 An impure sample of compound X has a melting point of 120 oC. X is purified and its melting point is measured again. Which row is correct? method of purifying X melting point of pure X / oC A crystallisation 115 B distillation 115 C crystallisation 125 D distillation 125 4 When dilute hydrochloric acid is added to a white powder, a gas is produced. The solution remaining is tested separately with small volumes of both aqueous ammonia and aqueous sodium hydroxide. A white precipitate is produced in both tests. What is the white powder? A aluminium oxide B calcium oxide C copper(II) carbonate D zinc carbonate ��

3 6092/1/9/22 [Turn over 5 Which statement explains why isotopes of the same element have the same chemical properties? A They have the same electronic structure. B They have the same relative mass. C They have the same nucleon number. D They have the same proton number. 6 An aqueous solution of a sulfate is made from a solid hydroxide, of a metal M, by the reaction: M(OH)2(s) + H2SO4(aq) → MSO4(aq) + 2H2O(l) For which hydroxide would the method not work? A barium hydroxide B copper(II) hydroxide C iron(II) hydroxide D magnesium hydroxide 7 A covalent compound P has the empirical formula CH2O. Which structure represents P? 8 Which row explains why copper is a good conductor of electricity at room temperature? copper ions move freely electrons move freely A no no B no yes C yes no D yes yes 9 What is the structure of sand? A an ionic lattice B a macromolecule C a polymer D a simple molecule A B C D ��

4 6092/1/9/22 10 Pentane, C5H12, has a higher boiling point than propane, C3H8. Which statement explains the difference in boiling point? A Carbon-carbon single bonds are stronger than carbon-hydrogen bonds. B Pentane has more covalent bonds to break. C Pentane does not burn as easily as propane. D The forces of attraction between pentane molecules are stronger than those between propane molecules. 11 Sodium nitride contains the nitride ion, N3-. Sodium nitride is unstable and decomposes into its elements. What is the equation for the decomposition of sodium nitride? A 2NaN3 → 2Na + 3N B 2Na3N → 6Na + N2 C 2NaN3 → Na2 + 3N2 D 2Na3N → 6Na + 2N 12 What is the mass of one mole of carbon-13? A 0.013 g B 0.026 g C 1 g D 13 g 13 The Haber process is a reversible reaction. N2(g) + 3H2(g) ⇌ 2NH3(g) The reaction has a 30% yield of ammonia. Which volume of ammonia gas, NH3, measured at room temperature and pressure, is obtained by reacting 0.75 moles of hydrogen with excess nitrogen? A 3600 cm3 B 5400 cm3 C 12000 cm3 D 18000 cm3 ��

5 6092/1/9/22 [Turn over 14 Which diagram shows the direction of movement of ions and electrons during the electrolysis of molten sodium chloride? 15 The apparatus shown is set up to plate a steel key with copper. The key does not get coated with copper. Which change needs to be made to plate the key? A increase the concentration of the aqueous copper(II) sulfate B increase the voltage C replace the solution with dilute sulfuric acid D reverse the electrical connections A B C D power supply power supply power supply power supply cathode anode cathode anode anode cathode anode cathode copper aqueous copper(II) sulfate steel key ��

6 6092/1/9/22 16 Which pair of metals X and Y will produce the highest voltage when used as electrodes in a simple cell? metal X metal Y A copper silver B magnesium silver C magnesium zinc D zinc copper 17 Which row describes the changes that occur in an endothermic reaction? energy change temperature A energy given out to the surroundings decreases B energy given out to the surroundings increases C energy taken in from the surroundings decreases D energy taken in from the surroundings increases 18 Which statement about fuels is correct? A Heat energy is only produced by burning fuels. B Hydrogen is used as a fuel although it is difficult to store. C Methane is a good fuel because it produces only water when burned. D Uranium is burned in air to produce energy. metal X in a solution of a salt of X metal Y in a solution of a salt of Y porous wall ��

7 6092/1/9/22 [Turn over 19 Which statement about endothermic and exothermic reactions is correct? A In an endothermic reaction, less energy is absorbed in bond breaking than is released in bond forming. B In an endothermic reaction, the activation energy is always higher than in an exothermic reaction. C In an exothermic reaction, more energy is absorbed in bond breaking than is released in bond forming. D In an exothermic reaction, the reactants are higher energy level than the products on an energy level diagram. 20 The apparatus shows a method of following the rate of the reaction between magnesium carbonate, MgCO3, and dilute nitric acid, HNO3. MgCO3(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2O(l) + CO2(g) The graph shows the volume of gas collected against time. Three statements are made about the experiment. 1 The mass of the flask and its contents decreases as time increases. 2 The rate of the reaction decreases as time increases. 3 The reaction has finished after four minutes. Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only flask magnesium carbonate and dilute nitric acid volume of gas collected / cm3 time / minutes ��

8 6092/1/9/22 21 How does increasing the concentration affect the reacting particles in a chemical reaction? increases the collision rate increases the proportion of particles with the activation energy A ü û B ü ü C û û D û ü 22 Zinc oxide is an amphoteric oxide. Which of the following substances will react with zinc oxide? A acids and bases B acids only C bases only D neither acids nor bases 23 When aqueous iron(I