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 at 50 oC diffuses more slowly than krypton at 20 oC? A Bromine gas has a higher relative mass than krypton. B Bromine gas is at a higher temperature than krypton. C Bromine gas is diatomic and krypton is monoatomic. D Bromine gas is more reactive than krypton.

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary 4 Express Chemistry 6092/1 4 6 The table shows information about particles X and Y. number of protons number of neutrons electronic configuration X 9 10 2, 8 Y 17 20 2, 8, 8 Which statement is correct for both X and Y? A They are atoms of metallic elements. B They are atoms of noble gases. C They are isotopes of the same element. D They are negative ions. 7 Magnalium is an alloy of aluminium (85 %) and magnesium (15 %). Some properties of magnalium are listed below. Which property of magnalium is the main reason for its use in the construction of aircrafts? A It conducts electricity. B It is denser than aluminium. C It is stronger than aluminium or magnesium. D The surface of the alloy is covered by a layer of magnesium oxide. 8 Borazine is a compound with the chemical formula B 3H6N3, and the full structural formula is given as follows: Which statement about borazine is not true? A Borazine is a crystalline solid with a high melting point. B Boron shows the same valency as nitrogen in the compound. C The percentage composition of nitrogen is 51.9 %. D The relative molecular mass of borazine is 81.

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary 4 Express Chemistry 6092/1 5 9 Which two substances have similar three-dimensional arrangements of their atoms? A diamond and silicon dioxide B graphite and diamond C iodine and graphite D silicon dioxide and iodine 10 The graph below shows the variation of a physical property of elements in Period 3 in the Periodic Table. What is the physical property that varies? A atomic radius B electrical conductivity C melting point D valency

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary 4 Express Chemistry 6092/1 6 11 Elements X and Y are in Group 1 of the Periodic Table. When X and Y are added to separate beakers of cold water, X is first observed to sink to the bottom of the beaker, while Y floats on water. Which statements about X and Y are correct? 1 Atoms of Y have more protons than atoms of X. 2 Effervescence is observed immediately when Y is added to cold water. 3 X has a lower boiling point than Y. A 1 only B 3 only C 2 and 3 D 1, 2 and 3 12 Which compound contains the highest percentage of sulfur by mass? A H2SO3 B K2S C PbS2 D SO2 13 In the industrial extraction of iron, haematite, an iron ore mainly consisting of iron( III) oxide, is heated in the presence of carbon monoxide as shown below: Fe2O3 (s) + 3CO (g) → 2Fe (l) + 3CO2 (g) A 10.00 kg sample of haematite reacts with excess carbon monoxide to produce 4.70 kg of iron. What is the percentage purity of the iron(III) oxide in haematite? A 44.8 % B 47.0 % C 57.8 % D 67.1 %

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary 4 Express Chemistry 6092/1 7 14 Analysis of molecule X shows that it contains, by mass, 59 % carbon, 10 % hydrogen and 31 % oxygen. Which other information is needed to determine the molecular formula? A atomic numbers of carbon, hydrogen and oxygen only B atomic numbers of carbon, hydrogen and oxygen and relative molecular mass of X C relative atomic masses of carbon, hydrogen and oxygen only D relative atomic masses of carbon, hydrogen and oxygen and relative molecular mass of X 15 To reduce atmospheric pollution, the waste gases from a coal -burning power station are passed through powdered calcium carbonate. Which waste gas will not be removed by the powdered calcium carbonate? A carbon monoxide B nitrogen dioxide C phosphorus(V) oxide D sulfur dioxide 16 Which two statements confirm the acidic nature of H2SO4 (aq)? 1 Addition of Universal Indicator to the solution shows that it has a pH value of less than 7.0. 2 A white precipitate is formed when aqueous barium nitrate is added to the solution. 3 The solution reacts with copper(II) oxide to form a blue solution. 4 The solution turns anhydrous cobalt(II) chloride from blue to pink. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4 17 Which statement best explains why farmers should not add slaked lime and ammonium nitrate fertiliser to the soil at the same time? A It is not economically viable to add two substances to the soil at the same time. B The slaked lime will react with the ammonium nitrate to make the soil too alkaline for plant growth. C The slaked lime will react with the ammonium nitrate to produce acid which inhibit s plant growth. D The slaked l