Copy of ACSBR 6092 Sec 4 Prelims 2024_P1

Name Class Index Number Anglo-Chinese School (Barker Road) PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CHEMISTRY 6092/1 TIME: 1 HOUR INSTRUCTIONS TO CANDIDATES: Do not open this booklet until you are told to do so. Read the instructions on the OTAS answer sheet carefully. Write your index number, subject code and paper number clearly on the OTAS answer sheet provided for you. There are forty multiple choice 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 OTAS answer sheet. INFORMATION FOR CANDIDATES 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. The use of an approved scientific calculator is expected, where appropriate. A copy of the Periodic Table is printed on the last page.

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary 4 Express Chemistry 6092/1 2 This paper consists of 19 printed pages including the cover page. 1 An experiment is carried out to investigate the rate of reaction when calcium carbonate reacts with hydrochloric acid. The volume of carbon dioxide gas given off is measured at different intervals of time. The diagram shows pieces of apparatus used to collect gases. 1 calibrated gas syringe 2 downward delivery 3 displacement of water with a graduated tube Which apparatus is suitable to collect and measure the volume of carbon dioxide? A 1 only B 2 only C 1 and 3 D 1, 2 and 3 2 The table below shows some properties of ethanol and hexane. ethanol hexane Mr 18 86 boiling point / °C 78.4 68.7 density / g/cm3 0.789 0.655 miscibility in water miscible immiscible How can a mixture of ethanol and water and a mixture of hexane and water be separated? ethanol and water mixture hexane and water mixture A fractional distillation chromatography B fractional distillation fractional distillation C fractional distillation separating funnel D separating funnel fractional distillation

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary 4 Express Chemistry 6092/1 3 3 The chromatogram of a sugar syrup is shown below: Which of the following statements can be inferred from the chromatogram? A The experiment is unfair because the chromatogram is not conducted vertically. B The molecules of the blue dye diffused faster than those of the red dye. C The red dye is more soluble in the solvent than the blue dye. D The Rf value of the blue dye is greater than that of the red dye. 4 Which diagram shows the arrangement of particles in a mixture of an element and a compound? A B C D 5 Which statement correctly explains why bromine gas