2022 ESSS Chem Prelims P1

CHEMISTRY 6092/01 Paper 1 Multiple Choice Tuesday 1 hour 13 September 2022 0800 – 0900 Additional Materials: Multiple Choice Answer Sheet ___________________________________________________________________ READ THESE INSTRUCTIONS FIRST This question booklet consists of 16 printed pages including the cover page. East Spring Secondary School Towards Excellence and Success Preliminary Examination 2022 Secondary 4 Express Name: …………………………………………………………………………………….… ( ) Class: ……………… Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, index number on the 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 16. The use of an approved scientific calculation is expected, where appropriate. ���

2 1 Gas X is very soluble in water, less dense than air, and turns moist red litmus paper blue. Which method would be most suitable to collect a dry sample of the gas? A B C D 2 A gas, T, has the following properties: 1 a choking smell 2 turns damp blue litmus paper red, then bleaches it 3 does not decolourise acidified potassium manganate(VII) What is T? A ammonia B chlorine C carbon dioxide D sulfur dioxide X dry X dry X water calcium oxide calcium oxide dry X dry X X X X concentrated sulfuric acid ���

3 3 Two students investigated the substances that produce the colour in a type of sweet. The solution obtained from the sweet was separated by paper chromatography. The chromatograms obtained by the two students are shown below. student 1 student 2 Why are the two chromatograms obtained different? A The two students used different solvents. B One of the students did not use enough solvent. C The solvent for student 2 did not reach the top of the paper. D The solvent moved up the paper at different speeds. 4 A student was provided with a solid mixture, M. The table below shows some information about the three substances found in mixture M. substance boiling point / °C solubility in water W 140 soluble X 90 insoluble Y 95 soluble The student was told he could carry out some of the following steps to separate the three substances in mixture M. 1 filtration 2 fractional distillation 3 evaporation 4 addition of water In which order should the student carry out the steps? A 1, 2, 3 B 2, 1, 3 C 4, 1, 2 D 4, 3, 1 ���

4 5 Deuterium, D, is an isotope of hydrogen. Which statement about deuterium is not correct? A An atom of deuterium contains one proton. B It forms the ion D+. C It has the same density as hydrogen. D It reacts with ethene to form the compound CH2DCH2D. 6 An ion, X2-, has p nucleons and q electrons. What does the nucleus of an atom of X contain? number of protons number of neutrons A q − 2 p – q B q − 2 p – (q – 2) C q + 2 p – (q – 2) D q + 2 p – (q + 2) 7 Boron is a non-metallic element which is placed above aluminium in Group III of the Periodic Table. It forms a compound with nitrogen known as boron nitride which has a structure similar to graphite. A student made the following conclusions about boron nitride. 1 Boron nitride has a layered structure with weak attraction forces between the layers. 2 The empirical formula of boron nitride is BN. 3 The boron and nitrogen atoms are likely to be arranged alternately in a hexagonal pattern. Which of the conclusions about boron nitride are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 ���

5 8 In which molecule are all the outer electrons of the atoms involved in bonding? A CH3CH3 B H2O C HF D NH3 9 When a covalent liquid boils, its molecules are spaced further apart. Which property of the molecules affects the energy required to boil a covalent liquid the most? A the reactivity of the molecules B the shape of the molecules C the strength of the covalent bonds between the atoms D the strength of the forces of attraction between the molecules 10 20 cm3 of propene gas reacts with 500 cm3 of oxygen according to the equation shown below. 2C3H6 + 9O2 → 6CO2 + 6H2O What is the total volume of gas remaining at the end of the reaction? (all volumes are measured at room temperature and pressure.) A 120 cm3 B 410 cm3 C 470 cm3 D 530 cm3 11 An excess of dilute hydrochloric acid was added separately to the following. 1 2.4 g of magnesium 2 4.2 g of magnesium carbonate 3 2.0 g of magnesium oxide, then warmed Which statement is correct? A The number of moles of magnesium chloride formed would be the greatest in reaction 1. B The number of moles of magnesium chloride formed would be the greatest in reaction 2. C The number of moles of magnesium chloride formed would be the greatest in reaction 3. D The number of moles of magnesium chloride formed would be the same for all three reactions. 12 When 20 g of a sample of impure calcium carbonate is heated, 6.6 g of carbon dioxide is obtained. What is the percentage purity of the sample of calcium carbonate? A 15% B 33% C 50% D 75% ���

6 13 Aqueous copper(II) sulfate is electrolysed using a positive copper electrode and a negative graphite electrode. Which row is correct? at the positive electrode at the negative electrode A electrode dissolves copper deposited B hydrogen gas given off oxygen gas given off C oxygen gas given off copper deposited D electrode dissolves hydrogen gas given off 14 In the set-up below, a lead electrode, an electrode made of metal X and dilute sulfuric acid are used to produce electrical energy. With reference to the set-up, which of the following statements is correct? A The lead electrode is the negative electrode. B Metal X is below lead in the reactivity series. C The mass of the lead electrode decreases. D The mass of the metal X electrode decreases. 15 Which of the following statements best describes the mechanism of a hydrogen-oxygen fuel cell? A Hydrogen and oxygen undergo redox reactions to generate electricity. B Hydrogen ions react with hydroxide ions to generate electricity. C Electricity is used to provide heat energy. D Electricity is used to generate hydrogen and oxygen. lead electron flow electrode made of metal X dilute sulfuric acid ���

7 16 The energy diagram below represents a chemical reaction carried out with a catalyst and without a catalyst. What is the enthalpy change for catalysed reaction? A −150 kJ/mol B −50 kJ/mol C +50 kJ/mol D +100 kJ/mol 17 A student performs two experiments at room temperature. In experiment 1, 10 g of magnesium ribbon was reacted with excess 2.0 mol/dm3 of dilute hydrochloric acid. In experiment 2, 5 g of magnesium powder was reacted with excess 2.0 mol/dm3 of dilute hydrochloric acid. In both experiments, the volume of hydrogen, V, was plotted against tim