ACSBR 4NA 5105 2024 prelim Paper 3_EDITED

Anglo-Chinese School (Barker Road) PRELIMINARY EXAMINATION 2024 SECONDARY FOUR NORMAL (ACADEMIC) SCIENCE (CHEMISTRY) PAPER 3 5105/3 1 HOUR 15 MINUTES (FOR BOTH PAPERS) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on the Answer sheet in the spaces provided. There are twenty 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. Answers to Paper 3 and Paper 4 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on the last page. The use of an approved scientific calculator is expected, where appropriate. This document consists of 8 printed pages.

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary Four Normal (Academic) Science (Chemistry) 5105 Paper 3 Page 2 1 Which substance is a liquid at 50 oC? melting point/ oC boiling point/ oC A –117 43 B –93 69 C 36 49 D 55 103 2 A salt is made by adding an excess of an insoluble metal oxide to an acid. Which method is used to remove excess metal oxide from the mixture? A chromatography C distillation B crystallisation D filtration 3 Dye X is compared with four other dyes, P, Q, R and S using chromatography. The chromatogram is shown below. What can be deduced from the results of chromatography? A Dyes P and S are insoluble in the solvent. B Dyes P and S are pure. C X consists of dyes Q, R and S. D X contains two different components. solvent front start line X P Q R S

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary Four Normal (Academic) Science (Chemistry) 5105 Paper 3 Page 3 4 Which diagram shows a representation of a mixture of compounds? 5 The number of atoms can be derived from the chemical formula of the compound. Which row is not correct? formula number of atoms A CaCO3 1 calcium, 1 carbon, 3 oxygen B C2H5OH 1 carbon, 5 hydrogen, 1 oxygen C KOH 1 hydrogen, 1 oxygen, 1 potassium D H2SO4 2 hydrogen, 4 oxygen, 1 sulfur 6 In the Periodic Table, how does the metallic character of the elements vary from left