2022 YYSS Chem Prelims P1

YUYING SECONDARY SCHOOL PRELIMINARY EXAMINATION Secondary 4 Express NAME CLASS REG. NO CHEMISTRY 6092/1 Paper 1 25 August 2022 1 hour Candidates answer on the Question Paper. Setter: Mr Danny Louis Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, class and register number on this question booklet. Write in dark blue or black pen on both sides of the paper. You may use a pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The use of an approved calculator is expected, where appropriate. A copy of the Periodic Table is printed on page 17. For Examiner’s Use Total This document consists of 17 printed pages. 40 ���

2 1 A beaker of gas P is inverted over a porous pot containing gas Q as shown. Which pair of gases will result in the water level remaining unchanged? P Q A CH4 N2 B C2H4 CO C C2H6 CO2 D C3H8 O2 2 Which of the following occurs when iodine sublimes? A distance between iodine particles increases B forces of attraction between iodine particles become stronger C iodine particles become lighter D iodine particles begin to be arranged in a more orderly manner ���

3 3 The following shows the heating curve of ice. Which description in the table below best explains the respective section of the graph? section description A P to Q all ice molecules are in fixed positions B Q to R the average kinetic energy of the particles remains constant C R to S the volume of steam is increasing D T to U water is boiling 4 Propyl ethanoate and water are two liquids, which are immiscible. Which method is best to separate a mixture of propyl ethanoate and water? A filtration B fractional distillation C use a separating funnel D evaporation to dryness 5 Which piece of apparatus is not required to obtain water from a can of green tea? A white tile B condenser C distillation flask D fractionating column P Q R S T U time (minutes) temperature (°C) ���

4 6 Paper chromatography was used to separate an ink which is comprised of several dyes. In the experiment, a few drops of solvent was added to the centre of the filter paper and allowed to spread out. The diagram below shows the chromatogram obtained from the experiment. Which dye has the greatest solubility in the solvent used? 7 The diagrams below can be used to illustrate the following. I pure element II mixture of elements III pure compound IV mixture of elements and a compound W