USS 2024 P2 QP & ANS MS

USS PRELIM 2024/6092/01 Pure Chemistry Page 1 of 18 UNITY SECONDARY SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CHEMISTRY 6092/01 Paper 1 Multiple Choice 22 Aug 2024 1 hour Additional Materials: Multiple Choice Answer Sheet MARKS /40 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluids. Write your Name, Form Class, Index Number and Teaching Group on the Question Paper and Answer Sheet in the spaces 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 18. The use of an approved scientific calculator is expected, where appropriate. This paper consists of 18 printed pages, including this cover page. [Turn over Name: Form Class Index No Teaching Group O

USS PRELIM 2024/6092/01 Pure Chemistry Page 2 of 18 1 A student follows the rate of the reaction when 0. 08 g of magnesium reacts with excess hydrochloric acid at room temperature and pressure. What is most suitable for measuring the volume of gas produced at different times during the experiment? A a 50 cm3 gas syringe B an inverted 50 cm3 burette filled with water C an inverted 100 cm3 measuring cylinder filled with water D place the apparatus on a balance and measure the loss in mass 2 A student uses paper chromatography to find an Rf value for Fe3+(aq). The result is shown below. To make the spot containing Fe3+(aq) more visible, the paper is sprayed with aqueous sodium hydroxide so that a precipitate of iron(III) hydroxide forms. Under the conditions of the experiment, the Rf value of Fe3+(aq) is given by …..1….. and the colour of the precipitate is …..2….. Which row correctly completes gaps 1 and 2? gap 1 gap 2 A x y green B x y red-brown C y x green D y x red-brown solvent front start line Fe3+ y x

USS PRELIM 2024/6092/01 Pure Chemistry Page 3 of 18 3 Three separations are listed. 1 obtaining ethanol from the fermentation of glucose 2 obtaining nickel from a solid mixture of iodine and nickel 3 obtaining nitrogen from liquid air Which techniques would be involved in these separations? 1 2 3 A distillation sublimation fractional distillation B distillation crystallisation evaporation C using a separating funnel sublimation fractional distillation D using a separating funnel crystallisation evaporation 4 A sample of clean, dry air is cool to –190 °C. The carbon dioxide forms a solid at –79 °C. element in clean, dry air melting point / °C boiling point / °C argon oxygen nitrogen –189 –218 –210 –186 –183 –196 What is the state of argon, oxygen and nitrogen at –190 °C? argon oxygen nitrogen A gas gas gas B gas solid liquid C solid liquid gas D solid liquid liquid 5 The nucleus of M3+ contains a total of 27 particles. 13 of the particles have a charge. Which statement about the ion is correct? A It contains 13 neutrons and 10 electrons. B It contains 13 protons and 10 electrons. C It contains 13 protons and 13 electrons. D It contains 14 neutrons and 13 electrons.

USS PRELIM 2024/6092/01 Pure Chemistry Page 4 of 18 6 A sample of X was analysed and found to contain only two isotopes, X-63 and X-65. The graph below shows the relative abundances of the two isotopes. What is the relative atomic mass of X? A 63.2 B 63.4 C 63.6 D 64.0 7 Both calcium chloride and potassium chloride are ionic compounds. Which statement about these compounds is correct? A Potassium chloride has a higher melting point than calcium chloride because the potassium ion has a greater charge than calcium ion. B Calcium chloride and potassium chloride conduct electricity because positive and negative ions flow through the solid material. C Molten calcium chloride has a greater electrical conductivity than molten potassium chloride because calcium contributes more electrons to the delocalised ‘sea of electrons’ than potassium. D In the calcium chloride lattice, the ratio of calcium ions to chloride ions is half that of the ratio of potassium ions to chloride ions in the potassium chloride lattice. 8 Which statement about metals is not correct? A They conduct electricity because delocalised electrons can move throughout the metal. B They consist of layers of atoms that can slide over each other. C They have a giant lattice of oppositely charged ions in a ‘sea’ of delocalised electrons D They have a giant lattice of positive ions in a ‘sea’ of delocalised electrons relative abundance (%) relative atomic mass

USS PRELIM 2024/6092/01 Pure Chemistry Page 5 of 18 9 The electronic structures of two atoms, P and Q, are shown. P and Q combine to form a compound. What is the type of bonding in the compound and what is the formula of the compound? type of bonding formula A ionic PQ B ionic PQ2 C covalent PQ2 D covalent PQ 10 The structures of diamond and graphite are shown. Which statement about diamond and graphite is correct? A Diamond and graphite have low melting points. B Diamond and graphite have mobile electrons. C Diamond and graphite have layered structures. D Diamond and graphite contain strong covalent bonds between carbon atoms. 11 70 cm3 of butane was burnt with 300 cm3 of oxygen according to the equation below. C4H8(g) + 6O2(g) → 4CO2(g) + 4H2O(g) The reaction was then cooled to room temperature and the gases collected. What is the volume of gases collected? A 200 cm3 B 220 cm3 C 400 cm3 D 560 cm3

USS PRELIM 2024/6092/01 Pure Chemistry Page 6 of 18 12 The equation for the reaction between sodium carbonate and excess dilute hydrochloric acid is shown. Na2CO3 + 2HCl → 2NaCl + H2O + CO2 When 26.5 g of sodium carbonate reacts with excess dilute hydrochloric acid, what is the maximum volume of carbon dioxide produced? A 6 dm3 B 12 dm3 C 18 dm3 D 24 dm3 13 Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide. Which of the following shows the correct ionic equation, including state symbols, for this reaction? A CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) B Ca2+(aq) + CO32-(aq) + 2H+(aq) → Ca2+(aq) + H2O(l) + CO2(g) C CO32-(aq) + 2H+(aq) → H2O(l) + CO2(g) D CaCO3(s) + 2H+(aq) → Ca2+(aq) + H2O(l) + CO2(g) 14 A farmer spreads ammonium nitrate, a nitrogenous fertiliser, on a field. The next day he spreads calcium hydroxide on the same field. This caused a loss of nitrogen from the ammonium nitrate. Which chemical reaction occurred? A The calcium ions reacted with the ammonium ions, producing ammonia gas. B The calcium ions reacted with the nitrate ions, producing oxides