2023 FHSS Chem Prelims P1

Candidate Name: Class Index No. FUHUA SECONDARY SCHOOL 4E Secondary Four Express Preliminary Examination 2023 Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Seconda ry Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Seconda ry Fuhua Secondary CHEMISTRY 6092/01 Paper 1 Multiple Choice 30 August 2023 0800 – 0900 1 hour Additional Material: Optical Mark Recognition (OMR) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, index number on the OMR and this question booklet. 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 OMR. 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 Periodic Table is printed on page 14. The use of an approved scientific calculator is expected, where appropriate. Setter: Mr Elton Tan Vetter: Miss Nur Hanis This question paper consists of 14 printed pages including this page. PARENT'S SIGNATURE FOR EXAMINER'S USE 40

2 1 A student put exactly 25.0 cm3 of dilute hydrochloric acid into a conical flask. He added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need? A balance, measuring cylinder, thermometer B balance, pipette, stopwatch C balance, pipette, thermometer D burette, pipette, thermometer 2 Paper chromatography is carried out on three different mixtures of dyes, using the same solvent. Each mixture contains at least one of the dyes W, X, Y and Z. The Rf values of the dyes in the three mixtures are shown. dye Rf values from mixture 1 Rf values from mixture 2 Rf values from mixture 3 W 0.14 0.14 0.14 X 0.00 0.00 0.00 Y 0.50 0.50 0.50 Z 0.82 0.82 0.00 Which conclusion is correct? A Dye X is the most soluble dye. B Dye Y is the only dye present in all three mixtures. C Dye W is nearest to the solvent front and present in all three mixtures. D Dye Z is nearest to the solvent front and is found in only two of the mixtures. 3 The diagram below shows a set-up to prepare a dry sample of ammonia gas. The experiment failed. What modifications should be done to correct the set-up? 1 An alkali should be placed in the test-tube instead of an acid. 2