Greendale 6092/01 Chem Paper 1 QNs Prelim 2024

1 GREENDALE SECONDARY SCHOOL Preliminary Examination 2024 STUDENT NAME CLASS 4 TEACHING GROUP REG. NO CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, teaching group and register number in the spaces provided above and on the Multiple Choice Answer Sheet provided. 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 20. The use of an approved scientific calculator is expected, where appropriate This document consists of 20 printed pages. [Turn over

2 1 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 ammonia? [Mr: NH3, 17] 2 Which ion contains the same number of electrons as Fe26563+? A Co27593+ B Cr24522+ C Mn25562+ D Mn25553+ dry ammonia dry ammonia dry ammonia dry ammonia moist ammonia moist ammonia moist ammonia moist ammonia calcium oxide calcium oxide concentrated sulfuric acid concentrated sulfuric acid A B C D

3 3 The chromatogram of substance S is shown. Some distances, W, X, Y and Z, are labelled on the diagram. How is the Rf value of substance S calculated? A XY B WZ C YX D YW 4 Small crystals of purple KMnO4 (Mr = 158) and orange K2Cr2O7 (Mr = 294) were placed at the centres of separate petri dishes filled with agar jelly. They were left to stand under the same physical conditions. After some time, the colour of each substance had spread out as shown. The lengths of the arrows indicate the relative distances travelled by particles of each substance. Which statement is correct? A Diffusion is faster in dish 1 because the mass of the particles is greater. B Diffusion is faster in dish 2 because the mass of the particles is greater. C Diffusion is slower in dish 1 because the mass of the particles is smaller. D Diffusion is slower in dish 2 because the mass of the particles is greater. solvent front substance S baseline solvent level W X Z Y dish 1 dish 2 KMnO4 K2Cr2O7

4 5 A compound, XY4, is shown below. Both atoms of elements X and Y combine to obtain the electronic configuration of neon. Which row shows the correct group of elements X and Y and the number of non-bonding electrons in one molecule of XY4? group of X group of Y number of non-bonding electrons A 14 17 24 B 14 17 34 C 17 14 24 D 17 14 34 6 How many sodium ions are there in 30 g of sodium sulfate, Na2SO4? A 1.52 × 1023 B 2.54 × 1023 C 1.20 × 1024 D 6.02 × 1024 7 20 cm3 of propene was reacted with 150 cm3 of oxygen. The equation for the reaction is shown. 2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(l) What is the total volume of gas, measured at room temperature and pressure, that remained at the end of the reaction? A 60 cm3 B 90 cm3 C 120 cm3 D 180 cm3 Y Y Y Y X

5 8 Bromobutane, C4H9Br, can be made from butanol, C4H9OH, using the reaction shown. C4H9OH + HBr → C4H9Br + H2O In an experiment, 10 g of C4H9OH produced 12 g of C4H9Br. What is the percentage yield of C4H9Br? [Mr: C4H9OH, 74; C4H9Br, 137] A 45% B 54% C 65% D 83% 9 Calcium carbonate reacts with dilute hydrochloric acid according to the equation shown. CaCO3 + 2HCl ® CaCl2 + CO2 + H2O 10 g of calcium carbonate is reacted with 100 cm3 of 1.0 mol / dm3 hydrochloric acid. The following statements are made. 1 1.20 dm3 of carbon dioxide is formed. 2 5.55 g of calcium chloride is formed. 3 4.80 g of carbon dioxide is formed. 4 No calcium carbonate is left when the reaction is completed. Which statements about the reaction are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 10 The following statements describe acids, alkalis and water. 1 Hydrochloric acid is acidic because it contains H+ ions and no OH- ions. 2 Nitric acid is acidic because it contains more H+ ions than OH- ions. 3 Sodium hydroxide is alkaline because it contains OH- ions and no H+ ions. 4 Water is neutral because the concentration of H+ ions is equal to the concentration of OH- ions. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4

6 11 Beryllium hydroxide is an amphoteric white solid. Which reagent can be used to distinguish beryllium hydroxide from solid calcium hydroxide? 1 HCl(aq) 2 HNO3(aq) 3 KOH(aq) 4 NaOH(aq) A 1 or 2 B 1 or 3 C 2 or 4 D 3 or 4 12 Which method should be used to make a pure sample of potassium chloride? A adding AgCl(s) to KNO3(aq) B adding excess K2CO3(s) to HCl(aq) C mixing KNO3(aq) with NaCl(aq) D titrating KOH(aq) with HCl(aq) 13 50.0 cm3 of hydrochloric acid has a pH of 1.0. This acid requires 25.0 cm3 of aqueous sodium hydroxide to be neutralised. A second 50.0 cm3 solution contains the weak acid, ethanoic acid. The hydrochloric acid and ethanoic acid have the same concentration. How will the pH of ethanoic acid and the volume of NaOH needed for neutralisation differ, if at all, from the hydrochloric acid? pH volume of NaOH needed for neutralisation A higher than HCl lower than for HCl B higher than HCl equal to HCl C lower than HCl lower than for HCl D lower than HCl equal to HCl

7 14 Ammonia is produced by the reaction of the elements hydrogen and nitrogen in the Haber process. One of these elements is obtained from crude oil. The ammonia formed can be reacted with substance Q to form a salt. Ammonia can be displaced from this salt by reacting with substance R. Which row correctly shows the element obtained from crude oil and the types of substances corresponding to Q and R? element obtained from crude oil substance Q substance R A hydrogen acid base B hydrogen base acid C nitrogen acid base D nitrogen base acid 15 A mixture W, containing two compounds, is tested with different reagents. The results are shown. reagent observation excess aqueous ammonia followed by filtration green precipitate and colourless solution dilute nitric acid and aqueous silver nitrate no visible reaction dilute nitric acid and aqueous barium nitrate white precipitate warm with aqueous sodium hydroxide and aluminium foil moist red litmus paper remains red What are the two salts in solution W? A ammonium chloride and calcium sulfate B calcium nitrate and iron(II) chloride C iron(II) sulfate and zinc nitrate D iron(II) sulfate and zinc sulfate nitrogen hydrogen ammonia salt substance Q substance R ammonia

8 16 The following substances are used in the laboratory to test for various gases. acidified potassium manganate(VII) aqueous sodium hydroxide blue litmus paper limewater red litmus paper wooden splint When testing for ammonia, chlorine, hydrogen and oxygen, what is the minimum number of items from the table above needed to identify these four gases? A 2 B 3 C 4 D 5 17 Which pairs of statements correctly describe the differences between the conduction of electricity during electrolysis and the conduction of electricity by metals? conduction during electrolysis conduction by metals 1 The current is due to the movement of both positive and negative ions. The current is due to the movement of electrons. 2 Charged particles move towards both electrodes. Charged particles move in one direction only. 3 It results in a chemical change. It does not result in a