RVHS 2023 Chem Sec 3 Paper 1 QP

River Valley High School Pg 1 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 RIVER VALLEY HIGH SCHOOL SEC 3 END-OF-YEAR EXAMINATION CHEMISTRY PAPER 1 9 OCTOBER 2023 45 MINUTES NAME CLASS 3 INDEX NO. READ THESE INSTRUCTIONS FIRST DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number in the spaces provided. There are thirty questions in 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 provided. 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 12. The use of an approved scientific calculator is expected, where appropriate. _________________________________________________________________________ This document consists of 11 printed pages and 1 blank page.

River Valley High School Pg 2 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 1 Which piece of apparatus would be most suitable for measuring 25.5 cm3 of a liquid? A conical flask B volumetric flask C measuring cylinder D pipette 2 The Health Sciences Authority (HSA) tested a weight loss product which is suspected to contain harmful ingredients. The chromatogram of the weight loss product is obtained as shown below, along with a reference table of Rf values of some harmful ingredients. What are the harmful ingredients present in the weight loss product? A dexamethasone only B chlorpheniramine and dexamethasone only C frusemide and sibutramine only D chlorpheniramine, dexamethasone and sibutramine only 3 In an experiment, the melting point of an unknown solid was found to be 60 °C, the same as cyclohexene. To check its identity, the experiment was repeated by using equal parts of the solid and pure cyclohexene. The melting point of the mixture was found to be 50 – 53 °C. What can be deduced from the experimental results? A The unknown solid is a mixture. B The unknown solid is pure cyclohexene. C The unknown solid may contain cyclohexene. D The unknown solid is not cyclohexene.

River Valley High School Pg 3 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 4 Three separations are listed. 1 obtaining water from sodium chloride solution 2 obtaining iodine from a mixture of iodine and sodium chloride 3 obtaining solid sodium chloride from aqueous sodium chloride Which techniques would be involved in these separations? 1 2 3 A distillation sublimation evaporation B distillation sublimation filtration C filtration crystallisation evaporation D sublimation crystallisation filtration 5 Two gases, H2S (