2022 ACSI Chemistry Prelim Paper 1

1 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over Anglo-Chinese School (Independent) Year 4 Express Preliminary Examination 2022 CHEMISTRY PAPER 1 Multiple Choice 6092/1 Wednesday 24th August 2022 1 hour Additional materials: Calculator Multiple Choice answer sheet Soft clean eraser Soft pencil (type 2B recommended) INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write and shade the candidate 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 and D. Choose the one you consider correct and record your choice in soft pencil on the separate 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. You may use a calculator. A copy of the Periodic Table is printed on page 17. This question paper consists of 17 printed pages.

2 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 1 A student conducted an experiment by heating some ammonium chloride, NH4Cl, in a test tube. He tested the gases coming out of the tube with moist litmus papers. Which statement describes the observation made by the student regarding the experiment? A Both litmus papers changed colour at the same time. B The blue litmus paper turned red first. C The red litmus paper turned blue first. D There is no change in the colour of both litmus papers. 2 The diagram below shows two separate chromatograms. Both chromatograms were conducted using the same solvent. The chromatogram on the left shows four unknown sugars, A, B, C and D. The chromatogram on the right shows glucose and was stopped earlier than the one on the left which caused the solvent front to be lower. Which sugar, A, B, C and D, is glucose? solid ammonium chloride blue litmus paper red litmus paper heat solvent front starting line solvent front starting line A B C D

3 Anglo-Chinese School (Independent) 6092/1 Year 4 Express Preliminary Exam 2022 [Turn over 3 At which temperatures does seawater freezes and boils at sea level? freezes at boils at A 2oC 102oC B 2oC 98oC C - 2oC 102oC D - 2oC 98oC 4 Which of the following contains an element, a mixture and a compound? A water, seawater, table salt B air, petrol, carbon dioxide C silver, tungsten, magnesium oxide D titanium, steel, rust 5 Titanium has five stable isotopes and shows three oxidation states, +2, +3 and +4. Below is an ion formed from the most abundant isotope. 𝑇𝑇𝑇𝑇22 48 4+ Which of the