2022 WSSS Chem Prelims P1

West Spring Secondary School Preliminary Examination 2022 CHEMISTRY Paper 1 6092/01 SECONDARY 4 EXPRESS Name ( ) Date 31 August 2022 Class Duration 1 hour Additional materials: Laminated Periodic Table, Answer Sheet READ THESE INSTRUCTIONS FIRST Write your index number, class and name on the Answer Sheet. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. 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 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 laminated Periodic Table is provided separately. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages including the cover page. Setter: Mdm Sharena [Turn over ���

2 1 A student follows the rate of the reaction when 0.19 g of calcium carbonate reacts with excess acid at room temperature and pressure. What is most suitable for measuring volume of gas produced at different times during this experiment? A a 50 cm3 gas syringe B an inverted 250 cm3 measuring cylinder filled with water C an inverted 50 cm3 burette filled with water D place the apparatus on a balance and measure the loss in mass 2 The apparatus shown in the diagram was set up. Which gas, when present inside the beaker, will cause the water level at X to fall? A ammonia, NH3 C hydrogen, H2 B carbon dioxide, CO2 D nitrogen, N2 beaker porous pot water X air ���

3 3 Some students are asked to describe the difference between the particles in gases and liquids. Three of their suggestions are: 1 Particles in gases are further apart than particles in liquids. 2 Particles in gases are bigger than particles in liquids. 3 Particles in gases are smaller than particles in liquids. Which suggestion or suggestions are correct? A 1 only B 2 only C 3 only D 1, 2 and 3 4 The graph shows a change of temperature when substance Y is heated. Which stage shows that substance Y is melting? A A to B B B to C C D to E D E to F 5 At which temperature does a concentrated aqueous solution of sodium chloride begin to boil? A 93 °C B 99 °C C 100 °C D 104 °C temperature / °C 80 15 time / min A B C D E F ���

4 6 Fractional distillation is used to distil ethanol (boili