2022 DMSS Chem Prelims P1

1 [Turn over DAMAI SECONDARY SCHOOL Preliminary Examination 2022 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Secondary 4 Express Setter: Ms See Pei Zhen Additional Materials: Multiple Choice Answer Sheet 6092/01 23 August 2022 1 hour 40 marks READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, index number and class on all the work you hand in. There are forty questions in this section. 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. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 15. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages.

2 1 The graph shows the change in temperature with time when steam is cooled from 120 °C. Which of the following shows the correct change taking place between different points of the graph? points change A P to Q kinetic energy of particle remains constant B Q to R water boiling C R to S the volume of liquid is decreasing D T to U water freezing 2 A mixture is formed when two or more substances are physically combined together. Which statement about mixtures is true? A Equal masses of two substances must be used. B The mixture shows similar chemical properties to those of its constituents. C The substances must be both metals. D When the substances are combined, an ionic or a covalent compound forms. 3 What is necessary for two substances to be separated by paper chromatography? A They are both soluble in water. B They have the same solubility in the same solvent. C They have different solubilities in the same solvent. D Their solids have different densities in the same solvent. temperature/°C time/s 120 P Q R S T U

3 [Turn over 4 Whisky is a beverage composed of mainly water and ethanol. Scotch Whisky is usually made up of 60 % of ethanol by volume. A sample of Scotch Whisky is distilled using fractional distillation. Ethanol boils at 78 °C. Which graph shows the change in concentration of ethanol in the sample as the distillation proceeds? A B C D 5 Q is an element in the Periodic Table. Which of the following represents an isotope of Q3581? A Q3379 B Q3579 C Q4281 D Q4681 6 Which ion has the lowest number of electron shells containing electrons? A A