Kranji Secondary School - G3 Pure Chem Paper

Candidate Name: __________________________ ( ) Class: _______ KRANJI SECONDARY SCHOOL Preliminary Examination Secondary 4 Express CHEMISTRY 6092/01 Paper 1 Multiple Choice Wednesday 28 August 2024 1 hour KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST There are forty questions in this paper. Answer all questions. For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct and record your choice in soft pencil on the separate Answer Sheet. 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 18. The use of an approved scientific calculator is expected, where appropriate. Set by: Mrs Toh-Chong Keting This Question Paper consists of 18 printed pages. [Turn over 4E Session 2 www.KiasuExamPaper.com 56

2 1 Which piece of apparatus could be used to determine the end -point of the reaction between hydrochloric acid and potassium hydroxide? A electronic balance B gas syringe C stopwatch D thermometer 2 A student is provided with two drying agents: concentrated sulfuric acid and calcium oxide. Which method should he use to collect a sample of dry carbon dioxide gas? A B C D 3 The diagram shows the chromatogram obtained by analysis of a single dye. Three measurements are shown in the diagram below. How is the Rf value of the dye calculated? A x/(x+y) B y/(y+z) C y/(x+y+z) D z/(x+y+z) solvent front solvent level start line z cm x cm y cm www.KiasuExamPaper.com 57

3 [Turn over 4 The labels fell off two bottles each containing a colourless solution, one of which was sodium carbonate solution and the other was sodium chloride solution. Which of the following tests would allow for the identification of the solutions? A addition of aqueous ammonia B addition of dilute nitric acid C addition of lead(II) nitrate solution D addition of sodium hydroxide solution 5 Two solutions, W and X, were tested as shown. W X dilute sulfuric acid no visible reaction no visible reaction dilute nitric acid added, then aqueous barium nitrate white precipitate white precipitate aqueous ammonia added no precipitate seen white precipitate, soluble in excess, forming a colourless solution aqueous sodium hydroxide and aluminium foil added, then warmed gas given off which turns red litmus paper blue no gas given off What are solutions W and X? W X A sodium carbonate zinc sulfate B lead(II) nitrate ammonium carbonate C sodium nitrate ammonium carbonate D ammonium sulfate zinc sulfate www.KiasuExamPaper.com 58

4 6 A sample of solid X is heated strongly until it has completely melted. The graph shows how its temperature varies with time as molten X is cooled. Which of the following statements are true about the particles in X? 1 The arrangement is more orderly at stage RS than at stage PQ. 2 The forces of attraction are stronger at stage P than at stage S. 3 Their total energy content at stage QR is lower than at stage RS. 4 They are closer to each other at stage RS than at stage PQ. A 1 and 3 only B 1 and 4 only C 1, 2 and 3 only D 1, 3 and 4 only 7 The table shows the boiling points of the elements found in a sample of liquid air. element argon helium neon nitrogen oxygen boiling point / oC -186 -269 -246 -196 -183 Which elements would be gaseous at -190 oC? A argon, helium and nitrogen B argon, nitrogen and oxygen C helium, neon and nitrogen D helium, neon and oxygen P Q R S www.KiasuExamPaper.com 59

5 [Turn over 8 The descriptions of three substances are given as follows: substance description P When heated, carbon dioxide and a black solid are produced. Q Grey solid that reacts with water to give bubbles of gas. R It is a white solid that melts over a range of temperature. Which row correctly classifies substances P, Q and R? P Q R A compound compound mixture B compound element mixture C element element compound D element mixture element 9 Which element has the most number of electrons in the outermost shell of its atoms? A argon B boron C chlorine D potassium 10 The diagram shows the arrangement of the particles in a compound. Which compound would likely have this arrangement? A diamond B graphite C sodium chloride D water www.KiasuExamPaper.com 60

6 11 Which of the following substances contains both ionic and covalent bonds? A aluminium carbonate B hydrogen chloride C silicon dioxide D sodium 12 The diagram shows a structure of an ion. What is the correct position in the Periodic Table of the element from which this ion was formed? period group A 2 13 B 2 18 C 3 13 D 3 18 13 A cartoon hero was famous for his shiny armour, a gold -titanium alloy, which allowed him to fly to Mars and back to Earth without melting. Which of the following best describes the chemical bonds that exist within the structure of his armour? A Ions and atoms of gold and titanium are held by strong ionic forces. B Ions and atoms of gold and titanium are held by strong electrostatic forces. C Ions and electrons of gold and titanium are held by strong ionic forces. D Ions and electrons of gold and titanium are held by strong electrostatic forces. 14 Which quantity is the same for one mole of ethanol and one mole of ethane? A mass B number of atoms C number of molecules D volume at room temperature and pressure www.KiasuExamPaper.com 61

7 [Turn over 15 Zinc oxide is produced by heating zinc carbonate. ZnCO3 → ZnO + CO2 What is the percentage yield of zinc oxide if 125 g of zinc carbonate produces 75 g of zinc oxide on heating? [Mr: ZnCO3, 125] A 125 × 81 75 × 100 B 125 × 75 81 × 100 C 1 125 × 75 81 × 100 D 75 81 × 100 16 20 cm 3 of propene C 3H6, reacts with 500 cm 3 of oxygen according to the equation shown below. 2C3H6 (g) + 9O2 (g) → 6CO2 (g) + 6H2O (l) What is the total volume of gas remaining at the end of the reaction? (all volumes are measured at room temperature and pressure) A 120 cm3 B 410 cm3 C 470 cm3 D 530 cm3 17 An organic acid, W, contains the elements carbon, hydrogen and oxygen. The composition by mass of each element is shown. element in W percentage composition by mass carbon 35.8 hydrogen 4.5 oxygen 59.7 What is the empirical formula of W? A CH2O B C2H3O3 C C4H6O5 D C8H12O10 www.KiasuExamPaper.com 62

8 18 What does the term strong acid mean in relation to hydrochloric acid, HCl? A Each molecule can produce a maximum of one hydrogen ion. B It forms an insoluble salt, silver chloride. C It is completely dissociated in aqueous solution. D Its aqueous solution has a pH above 7. 19 Elements H, J, L are in the same period in the Periodic Table. The oxide of H dissolves in water to form a solution with a pH 12.5. The oxide of J forms a solution with a pH less than 4.5. The oxide