CHIJ 2025 Sec 4E5N Prelim Sc(Chem) P1 (final)

O CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2025 CANDIDATE NAME CLASS REGISTER NUMBER SCIENCE (CHEMISTRY, BIOLOGY) Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 5088/01 3 September 2025 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, class and register number on the Answer Sheet in the spaces provided unless this has been done for you. Do not use staples, paper clips, glue, correction fluid or correction tape. 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 Data Sheet is printed on page 23. A copy of the Periodic Table is printed on page 24. The use of an approved scientific calculator is expected, where appropriate. This document consists of 21 printed pages and 3 blank pages. [Turn over

2 CHIJSec/2025/OLevelPrelim/5088/01 1 An unknown substance X and four known substances P, Q, R and S, were analy sed by chromatography using two different solvents, water and ethanol. The resulting chromatograms are shown below. Which substances are found in X? A P and R only B R and S only C P, R and S only D P, Q, R and S 2 The diagrams show the arrangement of particles in the substances, X, Y and Z. Which row correctly describes X, Y and Z? X Y Z A compound element mixture B element compound mixture C element mixture compound D mixture compound element solvent front start line solvent: water solvent: ethanol X Y Z

3 [Turn over CHIJSec/2025/OLevelPrelim/5088/01 3 Bromine is a liquid at 20 oC. What could be the melting point and boiling point for bromine? melting point / oC boiling point / oC A −22 −3 B −8 −33 C −7 59 D 25 105 4 The diagram shows some properties of particles in an atom. To which labelled part of the diagram does electron belong? 5 An atom forms an ion with a charge of 2+ and the electronic configuration of 2,8,8. What is the proton number of the atom? A 16 B 17 C 19 D 20

4 CHIJSec/2025/OLevelPrelim/5088/01 6 Element P has n protons. Element Q has ( n – 3) protons and can achieve a stable electronic configuration by either sharing or accepting two electrons. What is the compound formed when element P reacts with element Q? A a covalent compound, PQ2 B a covalent compound, P2Q C an ionic compound, PQ2 D an ionic compound, P2Q 7 How many ions are there in 13.6 g of zinc chloride? A 1.2 x 1023 B 1.8 x 1023 C 1.2 x 1024 D 1.8 x 1024 8 Hydrogen is produced in all reactions shown. Which reaction produces the greatest volume of hydrogen, measured at room temperature and pressure. A 1.4 g of carbon reacts with excess steam. C + H2O → H2 + CO B 2.4g calcium hydride reacts with excess water. CaH2 + 2H2O → Ca(OH)2 + 2H2 C 4.0 g calcium reacts with excess dilute hydrochloric acid. Ca + 2HCl → CaCl2 + H2 D 50.0 cm3 of 2.0 mol/dm3 of sulfuric acid reacts with excess zinc. Zn + H2SO4 → ZnSO4 + H2

5 [Turn over CHIJSec/2025/OLevelPrelim/5088/01 9 The table shows the observations of some reactions of an oxide, XO, where X is an unknown element. reaction of XO with sodium hydroxide reaction of XO with hydrochloric acid reaction occurred reaction occurred What is the identity of element X? A carbon B lead C magnesium D sulfur 10 The table shows information of some pH indicators. indicators pH 2 3 4 5 6 7 methyl orange red yellow methyl red red yellow bromothymol blue yellow blue An unknown solution appears yellow when all three indicators are added to this solution. What is the pH of the unknown solution? A 4 B 5 C 6 D 7 11 In which reaction does the oxidation state of iron remain unchanged? A C + FeO → CO + Fe B PbO + Fe → Pb + FeO C 2FeCl2 + Cl2 → 2FeCl3 D Fe2O3 + 6HCl → 2FeCl3 + 3H2O

6 CHIJSec/2025/OLevelPrelim/5088/01 12 A solution of fertiliser was tested as shown. What are the ions present in the fertiliser solution? A Fe3+ and SO42- B Fe2+ and NO3- C NH4+ and NO3- D NH4+ and Fe2+ 13 Period 3 of the Periodic Table contains the elements from sodium to argon. Which statement is correct for the trend from left to right across Period 3? A The elements show a decrease in electrical conductivity. B The elements have an increasing melting point. C The elements have an increasing number of electron shells. D The elements react more violently with water. 14 Which statement about the element bromine is correct? A It displaces chlorine from aqueous sodium chloride. B It has a lower melting point than fluorine. C It is a diatomic metal. D It is lighter in colour than iodine. add excess aqueous sodium hydroxide damp red litmus paper turns blue warm the mixture dirty green precipitate forms fertiliser solution

7 [Turn over CHIJSec/2025/OLevelPrelim/5088/01 15 A student added dilute sodium hydroxide to dilute nitric acid and recorded an increase in the temperature of the mixture. Which row describes the reaction? type of reaction energy change A endothermic energy given out to surroundings B endothermic energy taken in from surroundings C exothermic energy given out to surroundings D exothermic energy taken in from surroundings 16 An experiment was conducted to investigate the rate of reaction when calcium carbonate is reacted with dilute hydrochloric acid. The procedure is as shown. • Place 50.0 cm3 of dilute hydrochloric acid in a conical flask. • Add a known volume of water to the conical flask. • Heat the mixture in the conical flask to the required temperature. • Add 1.0 g of calcium carbonate to the conical flask. • Measure the time taken for the reaction to complete. What volume of water and temperature will allow the reaction to complete in the shortest time? volume of water added / cm3 temperature / C A 10 30 B 10 50 C 40 30 D 40 50 17 A sample of petroleum is separated into three fractions, X, Y, and Z, using fractional distillation. Some properties of X, Y and Z are listed. • X is more viscous than Z. • Y has a higher boiling point than X. Which row correctly identifies the fraction with the longest carbon chain and highest volatility? longest carbon chain most volatile A Y X B Y Z C Z X D Z Y

8 CHIJSec/2025/OLevelPrelim/5088/01 18 The structure of a monomer is shown. Which structure shows part of the polymer chain formed from two molecules of the monomer? A B C D 19 Which row describes the methods of recycling plastics correctly? physical method chemical method A burning plastic to generate electricity cracking plastics into fuel B burning plastic to generate electricity compressing plastics into bricks C melting plastic into pellets for reuse cracking plastics into fuel D melting plastic into pellets for reuse compressing plastics into bricks 20 Which row identifies a natural source and an adverse effect of oxides of nitrogen? source adverse effect A decay of plant and animal matters acid rain B decay of plant and animal matters global warming C lightning activ