BBSS Prelim P1

Name: …………………………………………… Index No. …………. Class: …………… CHEMISTRY 6092/01 Paper 1 Multiple Choice 20 AUGUST 2024 1105 - 1205 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are forty 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 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 22. The use of an approved scientific calculator is expected, where appropriate. Bukit Batok Secondary School GCE O-LEVEL PRELIMINARY EXAMINATIONS 2024 SECONDARY 4 EXPRESS This document consists of 22 printed pages.

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 2 1 A student transferred exactly 25.0 cm3 of dilute hydrochloric acid into a conical flask. He added 2.50 g of solid calcium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to carry out this experiment? A burette, pipette, thermometer B electronic balance, measuring cylinder, thermometer C electronic balance, pipette, stopwatch D electronic balance, pipette, thermometer 2 The rate of diffusion of ammonia and oxygen gases were compared at 20 C and 60 C. Which would have the slowest rate of diffusion? A Ammonia gas at 60 C B Ammonia gas at 20 C C Oxygen gas at 60 C D Oxygen gas at 20 C 3 The melting and boiling points of four different substances are as shown. substance melting point / oC boiling point / oC ethane  183  87 lead 328 1744 nitrogen  210  196 phosphorus 44 280 From the data given above, which of the following statements is correct? A Ethane is a volatile liquid at room temperature. B Lead has the greatest kinetic energy at 300 oC. C Nitrogen has the weakest forces of attraction between its particles at -190 oC. D Phosphorus is likely to be a gas at 276 oC if it contains some impurities.

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 3 4 Liquids Y and Z are immiscible.  Y has a lower boiling point than Z.  Y has a lower density than Z.  Y and Z can be separated from each other both by fractional distillation and using a separating funnel. Which row correctly gives the first liquid to be collected by fractional distillation and using separating funnel? first liquid collected by fractional distillation first liquid collected using separating funnel A Y Y B Y Z C Z Y D Z Z fractional distillation separating funnel

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 4 5 Two samples of a colourless solution are tested separately with aqueous sodium hydroxide, NaOH(aq), and aqueous ammonia, NH3(aq), and the results are recorded.  Gas evolved turn moist red litmus paper blue when NaOH(aq) is added and warmed.  A white precipitate is formed with two drops of NH3(aq) and dissolves in an excess of NH3(aq). What can be deduced from these results? A The anion present is Cl – . B The anion present is NO3 – . C The cation present is Al 3+. D The cation present is Zn2+. 6 The diagram shows the relative mass and the relative charge of two sub-atomic particles, ● and ○, present in atoms and ions. Which of these particles are present in a hydrogen atom, H, and a hydrogen ion, H+ ? hydrogen atom, H hydrogen ion, H + A yes yes yes yes B yes yes no no C yes no yes no D yes no no no

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 5 7 A piece of magnesium reacts with dilute hydrochloric acid. The resulting solution is then evaporated leaving a solid white residue. Which statement is correct? A A covalent solid is formed in this process. B Each chlorine atom gains one electron in this process. C Each magnesium atom loses only one electron in this process. D Molecules of an element are formed during the reaction. 8 The table shows the melting point of three hydrocarbons. name of hydrocarbon melting point/ C methane  182 pentane  130 poly(ethene) 92 What is responsible for the differences in melting points? A different number of bonds B different relative molecular masses C different structure D stronger covalent bonds 9 Which pair of substances conducts electricity by respective mobile charged particles? conducts electricity by mobile electrons conducts electricity by mobile ions A aqueous potassium chloride copper B graphite solid potassium chloride C graphite aqueous potassium chloride D solid potassium chloride copper

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 6 10 Graphene is an allotrope of carbon. Graphene sheets are made up of carbon atoms which are linked in hexagonal shapes, as shown. Each carbon atom is covalently bonded to three other carbon atoms. Which set of properties will graphene have? 1 It is hard. 2 It has a high melting point. 3 It has a giant covalent structure. 4 It conducts electricity in the solid state. A 1 and 2 B 2 and 3 C 1, 2 and 3 D 2, 3 and 4 11 Which contains the greatest number of molecules? A 2.00 g of ammonia gas B 4.00 g of liquid bromine C 550 cm3 of hydrogen (measured at r.t.p.), D 1.55 x 1022 molecules of water graphene sheets carbon atom

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 7 12 1.00 g of boron carbide completely oxidises to form 2.50 g of boron oxide, B2O3, and 0.80 g of carbon dioxide. What is the empirical formula of boron carbide? A BC 2 B BC 4 C B 2C D B 4C 13 An impure sample of calcium carbonate contains calcium sulfate as an impurity. When excess hydrochloric acid was added to 3 g of the sample, 0.6 dm3 of gas was produced. What is the percentage purity of the calcium carbonate sample? A ቀ0.6 3 × 24ቁ÷ 3 × 100% B ቀ0.6 9 × 100ቁ÷ 3 × 100% C ቀ0.6 24 × 100ቁ÷3 ×100% D ቀ0.6 44 × 24ቁ÷3 ×100% 14 An excess of dilute sulfuric acid was added separately to the following reagents. reaction 1 1.2 g of magnesium reaction 2 4.0 g of magnesium oxide, then warmed reaction 3 8.2 g of magnesium carbonate Each reaction produces 100% yield of products. Which statement is correct? A The number of moles of magnesium sulfate would be greatest in reaction 1. B The number of moles of magnesium sulfate would be greatest in reaction 2. C The number of moles of magnesium sulfate would be greatest in reaction 3. D The number of moles of magnesium sulfate would be the same in all three reactions.

BBSS/PRELIMS 2024/ Sec 4/Chemistry/ Paper 1 Applying past knowledge to new situations 8 15 W, X, Y and Z have increasing proton numbers. They are all in Period 3 of the Periodic Table but not necessarily next to each other. The following statements were made about properties about the elements. 1 W has the least number of valence electrons. 2 Z has the lowest relative atomic mass. 3 W and Y contain the same number of shells of electrons. 4 X and Z could be in the same group in the Periodic Table. Which statement(s) is/are correct? A 2 only B 1 and 2 only C 1 and 3 only D 3 and 4 only 16 The equation shows a reaction between a halogen and a solution containing bromi