2024 CCKSS 4E Prelim SciCH P1

Marks: O LEVEL PRELIMINARY EXAMINATION 2024 40 Secondary Four Express CANDIDATE NAME CLASS INDEX NUMBER SCIENCE (CHEMISTRY, BIOLOGY) 5088/01 Paper 1 Multiple Choice 30 August 2024 Additional Materials: Multiple Choice Answer Sheet (OAS) 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces 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 on this paper. A copy of the Data Sheet is printed on page 9. A copy of the Periodic Table is printed on page 10. The use of an approved scientific calculator is expected, where appropriate. This document consists of 10 printed pages. Setter: Mrs Trina Wong Vetter: Ms Ang Jia Wei [Turn over

2024 / 4E / SCI CHEM / PRELIM / P1 2 1 A titration is carried out to measure the volume of hydrochloric acid needed to neutralise aqueous sodium hydroxide. Exactly 25.0 cm3 of aqueous sodium hydroxide is measured out into a conical flask and the hydrochloric acid is added drop by drop. Which apparatus is used during this experiment? aqueous sodium hydroxide hydrochloric acid A burette pipette B measuring cylinder burette C pipette burette D pipette measuring cylinder 2 A colourless solution P is tested separately with aqueous sodium hydroxide and with aqueous silver nitrate acidified with nitric acid. The results are shown. test aqueous sodium hydroxide aqueous silver nitrate acidified with nitric acid result white precipitate insoluble in excess white precipitate What is P? A calcium chloride B calcium sulfate C zinc chloride D zinc sulfate

2024 / 4E / SCI CHEM / PRELIM / P1 [Turn over 3 3 Paper chromatography is carried out on a mixture X and four individual dyes using the same solvent. Which dyes does mixture X contain? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4 4 Which statement about isotopes of the same element is correct? A They have different numbers of electrons but the same number of protons. B They have different numbers of electron shells but the same number of neutrons. C They have different numbers of neutrons but the same number of electron shells. D They have different numbers of protons but the same number of electrons. 5 Elements X and Y react to form a compound. Element X loses two electrons and element Y gains one electron. What is the charge on the ions of elements X and Y and what is the formula of the compound? charge on ion of X charge on ion of Y formula of compound A 2+ 1− X2Y B 2+ 1− XY2 C 2− 1+ X2Y D 2− 1+ XY2 mixture X dye 1 dye 2 dye 3 dye 4

2024 / 4E / SCI CHEM / PRELIM / P1 4 6 Which diagram shows the arrangement of the atoms in stainless steel? A B C D 7 What is the relative formula mass of Mg(OH)2? A 21 B 30 C 42 D 58 8 20 cm3 of ethene are reacted with 70 cm3 of oxygen. The equation for the reaction is shown. C2H4 (g) + 3O2(g) → 2CO2 (g) + 2H2O (l) All the volumes are measured at room temperature and pressure. What is the total volume of gas remaining at the end of the reaction? A 40 cm3 B 50 cm3 C 80 cm3 D 90 cm3 key = iron atom = chromium atom = carbon atom

2024 / 4E / SCI CHEM / PRELIM / P1 [Turn over 5 9 Solutions of two chemicals are mixed in a beaker. A reaction occurred and a decrease in surrounding temperature is observed. Which statement is correct? A An endothermic reaction occurs and the reacting chemicals gain energy. B An endothermic reaction occurs and the reacting chemicals lose energy. C An exothermic reaction occurs and the reacting chemicals gain energy. D An exothermic reaction occurs and the reacting chemicals lose energy. 10 Hydrogen reacts with iodine to form hydrogen iodide. H2 (g) + I2 (g) → 2HI (g) 1 At higher pressure, the molecules gain heat energy and move faster. 2 At higher pressure, the molecules are closer together to one another. 3 At higher pressure, the molecules collide more frequently and effectively. Which statements explain why the reaction is faster when the pressure is increased, at constant temperature? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 11 Which change represents oxidation? A Cl2 à 2Cl– B CuO à Cu C Fe3+ à Fe2+ D Zn à Zn2+ 12 Zinc oxide is an amphoteric oxide. Which statement about zinc oxide is correct? A It will not react with hydrochloric acid but will react with sodium hydroxide. B It will not react with hydrochloric acid or sodium hydroxide. C It will react with hydrochloric acid and sodium hydroxide. D It will react with hydrochloric acid but not sodium hydroxide.

2024 / 4E / SCI CHEM / PRELIM / P1 6 13 Which statement about the elements in the Periodic Table is correct? A Elements are arranged in order of their nucleon number. B Elements are arranged in order of their proton number. C The period number is related to the number of electrons in the outer shell. D The reactivity of Group 1 elements decreases down the group. 14 The table shows the results of halogen displacement experiments. halogen added halide solution X– Y– Z– X2 Y2 Z2 – no reaction no reaction Y2 displaced – Y2 displaced Z2 displaced no reaction – What are halogens X, Y and Z? X Y Z A Br Cl I B Br I Cl C Cl I Br D Cl Br I 15 The diagrams show experiments to investigate rusting of iron nails. In which test-tubes do the nails rust? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 1 only 1 2 3 tap water salt water boiled water layer of oil

2024 / 4E / SCI CHEM / PRELIM / P1 [Turn over 7 16 Which substances react to form hydrogen gas? 1 copper and water 2 magnesium and steam 3 silver and dilute hydrochloric acid 4 zinc and dilute hydrochloric acid A 1, 2 and 4 B 2, 3 and 4 C 2 and 4 only D 4 only 17 Some combustion reactions produce pollutant gases. 1 2CH4 + 3O2 → 2CO + 4H2O 2 2H2 + O2 → 2H2O 3 C + O2 → CO2 4 N2 + O2 → 2NO Which reactions produce a pollutant gas that is not present in clean air? A 1 and 3 B 1 and 4 C 2 and 3 D 3 and 4 18 The fractional distillation of petroleum is shown. Which fraction contains hydrocarbons with the highest number of carbons? petroleum fuel gas bitumen A B C D

2024 / 4E / SCI CHEM / PRELIM / P1 8 19 In reaction R, 2000 molecules of CH2=CH2 react to form a single molecule X only. 2000CH2=CH2 → X Which terms describe reaction R, CH2=CH2 and X correctly? reaction R CH2=CH2 X A addition monomer polymer B addition polymer monomer C substitution monomer polymer D substitution polymer monomer 20 The results of two tests on compound Z are shown. test result add bromine water add aqueous sodium carbonate turns colourless carbon dioxide formed Which structure is Z? A B C D

2024 / 4E / SCI CHEM / PRELIM / P1 [Turn over 9 Data Sheet Colours of Some Common Metal Hydroxides aluminium hydroxide white calcium hydroxide white copper(II) hydroxide light blue iron(II) hydroxide green iron(III) hydroxide red-brown zinc hydroxide white

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