2022 BtySS Chem Prelims P1

BEATTY SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS REGISTER NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 31 August 2022 Setter: Mr Yeo Chee Keong 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 Multiple Choice Answer Sheet provided. 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 15. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page. [Turn over ��

2 1 Shermen investigates the change in mass during the combustion of magnesium . The diagrams show three set-ups for this investigation. Which set-up(s) is/are suitable for this investigation? A 3 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 only 2 The table shows the observations made when different reagents are added to an aqueous solution of Z. reagents added observations aqueous sodium hydroxide green-white precipitate; green precipitate only in excess sodium hydroxide dilute nitric acid followed by aqueous silver nitrate yellow precipitate dilute nitric acid followed by aqueous barium nitrate no visible reaction What are the ions present in solution Z? A Al3+, Fe2+, I− B Al3+, Fe3+, SO42− C Pb2+, Fe2+, I− D Pb2+, Fe3+, Cl− 3 A mixture of colourless amino acids is separated using chromatography. The solvent used is propanol and the chromatogram is sprayed with a locating agent. Which row describes the purpose of the propanol and the locating agent? purpose of propanol purpose of locating agent A to make the individual amino acids visible to prevent the amino acids moving any further B to move the amino acids up the chromatography paper to make the individual amino acids visible C to move the amino acids up the chromatography paper to prevent the amino acids moving any further D to prevent the amino acids moving too far up the paper to make the individual amino acids visible ��

3 4 How many underlined substance(s) can be obtained by fractional distillation of the mixture? • hydrogen from liquefied air • propene from bitumen • ethanol from water and ethanol mixture • ethyl ethanoate from ethanol and ethanoic acid A 1 B 2 C 3 D 4 5 Silver dichromate is a red solid that can be made by reacting silver nitrate solution with ammonium dichromate solution. The apparatus was set up as shown. After five minutes, a red solid appeared along the line marked ‘S’ on the diagram. What conclusion can be made from this experiment? A Diffusion of silver nitrate occurs faster than the diffusion of ammonium dichromate. B Silver ions have a lower relative molecular mass than dichromate ions. C Solid silver nitrate is more soluble than solid ammonium dichromate. D The red solid formed would dissolve to form a coloured solution. 6 A beam of protons was passed through an electrostatic field between two charged plates. The electrostatic field deflected the beam of protons. The lower the relative mass of the particle, the larger the deflection. The experiment was repeated using a beam of electrons in place of the beam of protons. Which row correctly shows the amount and direction of the beam of electrons? amount of deflection of beam of electrons direction of deflection of beam of electrons A deflected less than beam of protons opposite direction to beam of protons B deflected less than beam of protons same direction as beam of protons C deflected more than beam of protons opposite direction to beam of protons D deflected more than beam of protons same direction as beam of protons S ��

4 7 Which ion contains the same number of both neutrons and electrons? A 40Ca2+ B 19F− C 24Mg2+ D 32S2− 8 The arrangements of the electrons in two ions formed from elements X and Y are shown. Which equation represents the reaction between elements X and Y? A X2 + 2Y → 2X+ + 2Y– B X2 + 2Y → 2X– + 2Y+ C 2X + Y2 → 2X+ + 2Y– D 2X + Y2 → 2X– + 2Y+ 9 Magnesium oxide may be used for the lining of an electric furnace for making crockery. Which properties of magnesium oxide help to explain this use? ionic bonding electrical conductivity solubility in water A no yes no B no no yes C yes yes yes D yes no no 10 Both aluminium and graphite are good conductors of electric ity and have high melting points. Which row correctly shows the similarity and difference between aluminium and graphite? similarity difference A good conductors of electricity due to mobile electrons aluminium has a high melting point due to strong metallic bonds while graphite has a high melting point due to strong intermolecular forces B good conductors of electricity due to mobile electrons aluminium has a high melting point due to strong metallic bonds while graphite has a high melting point due to strong covalent bonds C high melting point due to strong forces of attraction aluminium conducts electricity due to positive cations while graphite conducts electricity due to mobile electrons D high melting point due to strong forces of attraction aluminium conducts electricity due to sea of delocalised electrons while graphite conducts electricity due to oppositely charged ions ��

5 11 One mole of magnesium, aluminium and sulfur are each completely burned in excess of oxygen gas. Which graph shows the number of moles of oxygen used for each element? 12 A sample of solid ammonium chloride decomposes on heating. solid ammonium chloride → ammonia gas + hydrogen chloride gas A total of 2.4 × 1021 molecules of gas is formed. What is the volume of ammonia gas produced? A 48 cm3 B 96 cm3 C 2.88 × 1025 cm3 D 5.76 × 1025 cm3 13 62 g of impure copper(II) carbonate undergoes thermal decomposition to produce 10 dm3 of carbon dioxide gas. What is the percentage purity of copper(II) carbonate? [Mr: CuCO3, 124] A 16.1% B 50.0% C 83.3% D 92.0% 14 In an electrolysis experiment, the same amount of charge deposited 12 g of titanium and 32 g of copper. The charge on the copper ion was 2+. [Ar: Ti, 48; Cu, 64] What was the charge on the titanium ion? A 1+ B 2+ C 3+ D 4+ ��

6 15 Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Which row correctly explains the change occurring during electrolysis? change occurring explanation A oxygen is liberated at the positive electrode OH− ions loses electrons more easily than Cl− ions B pH of the electrolyte increases H+ ions are discharged C products of electrolysis stay the same when molten sodium chloride electrolyte is used Na+ and Cl− ions are present in both electrolytes D solid sodium is deposited at the negative electrode Na+ ions are discharged 16 The reaction pathway for a reversible reaction is shown. Which statements about the reaction are correct? 1 The activation energy for the forward reaction is +70 kJ/mol. 2 The enthalpy change for the backward reaction is –50 kJ/mol. 3 The shape of the graph can be represented by the decomposition of silver salts in photographic films by light. 4 The shape of the graph can be represented by the dissol