Copy of 2024 SCGS Chemistry Prelim P1

CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER CHEMISTRY 6092/01 PAPER 1 Multiple Choice 28 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the Answer Sheet in the spaces provided. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C, 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 17. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 17 printed pages and 1 blank page SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR

2 1 Substance X can occur in three different physical states as shown in the diagram. Which statement is correct? A In state 1, the particles vibrate in fixed positions. B Diffusion occurs in the phase change from state 3 to state 2. C The volume of the substance in state 1 is fixed. D Condensation occurs in the phase change from state 1 to state 2. 2 The rate of diffusion of two gases, methane and propene, is investigated. Which gas diffuses at a faster rate and why? Faster gas Reason A propene It is unsaturated so is more reactive. B propene It is lighter so moves faster. C methane It has a lower molecular mass. D methane It has a lower boiling point. 3 The table gives the results of chromatography experiments that were carried out on some known food colours, using the same solvent. Name of food colour Distance form start line to solvent front (mm) Distance moved by food colour spot (mm) Ponceau 4R 60 42 Carmoisine 74 45 Fast red 67 27 Erythrosine 58 17 Which food colour is the most soluble in the solvent used? A Ponceau 4R B Carmoisine C Fast red D Erythrosine

3 4 The diagram shows the fractional distillation of crude oil. Which statement about fractions X and Y is correct? A X is more flammable than Y. B X is more viscous than Y. C X burns with a sootier flame than Y. D X has longer chain molecules than Y. 5 An unknown salt sample, X, has been sent off for analysis and identification using flame emission spectroscopy. In this kind of spectroscopy, atoms of an element each give a characteristic pattern of lines which is known as a line spectrum. A small sample of X loaded into a flame emission spectroscope and its line spectrum was generated. The line spectrum of X was compared