2024 Zhenghua Prelim MS

Paper 1 Multiple Choice 27 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Centre number and index number on the Answer Sheet in the spaces provided. There are forty questions on this paper. Answer all questions. For each question, there are four possible answers, A, B, C or 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 Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. Name of Setter: Ms Tan Li Er Natalie This document consists of 18 printed pages including this cover page. [Turn over ZHENGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CHEMISTRY 6092/01 Candidate Name: _____________________________ Index No: _____ Class: _________

2 1 Aqueous sodium hydroxide is neutralised by dilute hydrochloric acid in a titration. 25.0 cm 3 of aqueous sodium hydroxide is measured into a conical flask using a ...1... and a few drops of methyl orange indicator is added to the solution. The dilute hydrochloric acid is added to the conical flask using a ...2... . The end-point is reached when the methyl orange indicator turns ...3... . Which words correctly complete blanks 1, 2 and 3? 1 2 3 A burette pipette red B burette pipette orange C pipette burette orange D pipette burette red 25.0 cm3 of sodium hydroxide is measured using a pipette. Note the precision of the value. Value would have been recorded to 2dp if the instrument was a burette. Sodium hydroxide was present in the conical flask originally. The addition of methyl orange indicator would have turned the solution yellow in colour due to the high pH. Upon the addition hydrochloric acid, sodium hydroxide is neutralized and the end point is reached when the last drop of hydrochloric acid causes the solution to change colour from yellow to orange permanently.

3 2 Chromatogra