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 comp