2025 AES 5086 5088 Sc(Chem) Prelim P1 QP

Name: …………………………………………. ( ) Class: ………………….. [Turn over ASSUMPTION ENGLISH SCHOOL PRELIMINARY EXAMINATION 2025 SCIENCE (CHEMISTRY) 5086 / 01 5088 / 01 ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL LEVEL: Sec 4 Express / Sec 5 Normal (Academic) DATE : 3 September 2025 CLASS(ES): Sec 4/2, 4/3, 4/5 SBB, 5/1 DURATION : 1 hour (for both Science components) Additional Materials Provided: 1 sheet of OAS paper INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your NAME , CLASS and INDEX NUMBER at the top of this page and on the OAS paper. Shade your index number on the OAS paper. There are 20 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 OAS 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. For Examiner’s use: Paper 1 / 20 This question paper consists of 10 printed pages including this page.

2 5086/5088/01/4E/5N/PRELIM/25 SECTION A: MULTIPLE CHOICE QUESTIONS [20 MARKS] There are 20 questions in this section. Answer ALL questions. Choose the correct answer and record your choice on the OAS paper provided. 1 The diagrams show three sets of apparatus. 1 2 3 Which apparatus would be used to obtain separate dry samples of sand and salt from a mixture of sand and seawater? A 1 only B 3 only C 1 and 3 D 2 and 3 2 Gas Y is less dense than air, soluble in water and forms an alkaline solution. Which method is used to collect a sample of the gas? A B C D evaporating dish heat heat beaker filter funnel filter paper

3 5086/5088/01/4E/5N/PRELIM/25 4 W, X, Y and Z are elements in the same period of the Periodic Table. The letters are not the chemical symbols of the elements. Some information about the elements is shown below. W has an electronic configuration of 2,1. X loses 1 electron when it reacts. Y has an electron configuration of 2,6. Z gains 1 electron when it reacts. Which elements are metal? A W and X B W and Z C X and Y D Y and Z 5 What is the total number of atoms in a molecule of hydrated copper( II) sulfate, CuSO4∙5H2O? A 4 B 5 C 17 D 21 6 Which element contains the least number of atoms in 1 g? A carbon B iodine C iron D oxygen 3 Which diagram represents a monatomic gas? A B C D

4 5086/5088/01/4E/5N/PRELIM/25 7 Hydrochloric acid reacts with lithium hydroxide as shown below. HCl + LiOH → LiCl + H2O What is the volume of hydrochloric acid of concentration 2.0 mol/dm3 needed to fully react with 25.0 cm3 of lithium hydroxide of concentration 1.0 mol/dm3? A 12.5 cm3 B 25.0 cm3 C 50.0 cm3 D 100.0 cm3 8 40 cm3 of ethane burns in 210 cm3 of oxygen in the equation as shown. 2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (l) What is the volume of carbon dioxide produced at the end of the reaction, measured at room temperature and pressure? A 40 cm3 B 80 cm3 C 120 cm3 D 160 cm3 9 The graph shows how pH changes when different volumes of sodium hydroxide solution are added to 20.0 cm3 of dilute ethanoic acid. What is the vol ume of sodium hydroxide solution needed to neutralise 20.0 cm 3 of dilute ethanoic acid? A 10.0 cm3 B 20.0 cm3 C 25.0 cm3 D 30.0 cm3 pH volume of sodium hydroxide solution/ cm3

5 5086/5088/01/4E/5N/PRELIM/25 10 Which ionic equation represents the neutralisation of aqueous sodium hydroxide with dilute sulfuric acid? A H+ (aq) + OH− (aq) → H2O (l) B 2 Na+ (aq) + SO42– (aq) → Na2SO4 (aq) C NaOH (aq) + H+ (aq) → Na+ (aq) + H2O (l) D 2 Na+ (aq) + H2SO4 (aq) → Na2SO4 (aq) + 2 H+ (aq) 11 Two statements about the structure and properties of metals are given. statement 1: Metals are malleable and most have high melting points. statement 2: Metals are good conductors of electricity. Which of the following correctly describes statements 1 and 2? A Both statements are correct and statement 2 explains statement 1. B Both statements are correct but statement 2 does not explain statement 1. C Statement 1 is correct but statement 2 is incorrect. D Statement 2 is correct but statement 1 is incorrect. 12 The position of metals R and S in the reactivity series is shown. K, Na, R, Mg, Zn, Fe, S, Cu, Ag Which method is used to extract metals R and S from their ores? metal R metal S A electrolysis reduction with carbon B electrolysis electrolysis C reduction with carbon reduction with carbon D reduction with carbon electrolysis

6 5086/5088/01/4E/5N/PRELIM/25 13 Metals P, Q, R and S are placed in salt solutions as shown in the table. metal result of placing metal in solution of salt of P salt of Q salt of R salt of S P no reaction Q displaced R displaced no reaction Q no reaction no reaction no reaction no reaction R no reaction Q displaced no reaction no reaction S P displaced Q displaced R displaced no reaction What is the order of reactivity of the metals from the most reactive to least reactive? A R → Q → P → S B R → P → S → Q C S → P → R → Q D S → R → Q → P 14 Substance Y decolourises acidified potassium manganate(VII) solution, KMnO4. Which statement correctly describes the reaction above? A Substance Y is an oxidising agent and acidified KMnO4 has been oxidised. B Substance Y is an oxidising agent and acidified KMnO4 has been reduced. C Substance Y is a reducing agent and acidified KMnO4 has been oxidised. D Substance Y is a reducing agent and acidified KMnO4 has been reduced. 15 Which statement about alkanes is incorrect? A A molecule of propane contains 2 carbon atoms. B The general formula is CnH2n+2. C They react with chlorine in a substitution reaction under ultraviolet light. D The possible products of incomplete combustion are water, soot and carbon monoxide.

7 5086/5088/01/4E/5N/PRELIM/25 17 Tetracontane, C40H82, undergoes cracking as shown in the equation below. C40H82 → 12 C3H6 + V What is the molecular formula of product V and its physical state at room temperature and pressure? molecular formula of V physical state of V at r.t.p. A C6H12 solid B C6H12 gas C C4H10 solid D C4H10 gas 16 The diagram shows a fractionating column in the fractional distillation of petroleum. Which row about S and T are correct? S has a greater molecular size than T S has a higher boiling point than T A yes yes B yes no C no yes D no no fraction S fraction T heated petroleum

8 5086/5088/01/4E/5N/PRELIM/25 18 Which statement about vegetable oil and margarine is correct? A Both vegetable oil and margarine are liquids at room temperature. B Margarine has a lower melting point than vegetable oil. C Vegetable oil has more carbon-carbon double bonds than margarine. D Vegetable oil is made from margarine by hydrogenation. 19 80.0 cm3 of a sample of air is trapped in a syringe. The air is slowly passed over heated ir