MI H1 CHEM P1 Answer

Class Adm No Candidate Name: This question paper consists of 13 printed pages and 1 blank page. 2015 Promotional Examination II Pre-university 2 H1 CHEMISTRY 8872 / 01 Paper 1 Multiple Choice 23 Sept 2015 50 minutes Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and admission number in the spaces provided at the top of this page and on the Multiple Choice Answer Sheet provided. There are thirty 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 Multiple Choice Answer Sheet provided. Read the instructions on the Multiple Choice 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 question paper. The use of an approved scientific calculator is expected, where appropriate.

2 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Given the following isotopic composition of X, what is the relative atomic mass of a sample of X? Isotope Percentage abundance/ % X54 5.8 X56 91.6 X57 2.2 X58 0.4 A 55.9 B 56.0 C 56.1 D 56.2 2 What volume of O2 is used up when b cm3 of a 50:50 mixture by volume of methane and propane are completely burnt? A 3b cm3 B 7b 2 cm3 C 6b cm3 D 7b cm3 3 Which one of the following equations shows the smallest increase in the oxidation state of the underlined element? A 2HgCl2 + SnCl2 → Hg2Cl2 + SnCl4 B I2 + 2Na2S2O3 → Na2S4O6 + 2NaI C Cl2 + MnO4 2– → 2MnO4 –+ 2Cl – D Br2 + 2KI → 2KBr + I2 4 Which of the following could be the proton number of an element that has 2 unpaired electrons in its ground state? A 11 B 13 C 23 D 28

3 [Turn over 5 Which of the following sequences show the compounds , CH3CH2NH2, H 2O, Mg(CH 3COO)2, and Cl2 in order of increasing volatility? A Cl2, CH3CH2NH2, H2O, Mg(CH3COO)2 B CH3CH2NH2, Mg(CH3COO)2, H2O, Cl2 C Mg(CH3COO)2, H2O, CH3CH2NH2, Cl2 D Mg(CH3COO)2, Cl2, H2O, CH3CH2NH2 6 In the energy level diagram below, what does H4 represent? CaO(s) Ca2+(g) + O2-(g) Ca(g) + O(g) Ca(s) + O2(g) CaO(aq) H1 H3 H2 Energy/ kJ H4 A – ΔHf(CaO(s)) B ΔHf(CaO(s)) C – L.E(CaO(s)) D L.E(CaO(s)) 7 Use of the Data Booklet is relevant to this question. What is the enthalpy change of reaction, ∆Hrxn, for the reaction shown below? OC O CH3 CH3 (g) + NH3 (g) Hrxn NH2C O CH3 (g) + CH3OH (g) A +15 kJ mol-1 B –15 kJ mol-1 C +1515 kJ mol-1 D –1515 kJ mol-1 ½

4 8 The rate of reaction of a strip of magnesium and 30 cm3 of 1.20 mol dm-3 HCl is determined at 30 °C. In which case would both new conditions contribute to an increase in the rate of reaction? A Mg powder and 100 cm3 of 1.20 mol dm-3 HCl B Mg powder and 30 cm3 of 1.0 mol dm-3 HCl C 100 cm3 of 1.20 mol dm-3 HCl at 40 °C D 30 cm3 of 1.50 mol dm-3 HCl at 40 °C 9 The table gives data for the reaction between reactants D and E at constant temperature. Experiment [D] /mol dm–3 [E] /mol dm–3 Initial rate / mol dm–3 s–1 1 0.055 0.330 1.50 × 10–3 2 0.110 0.330 6.00 × 10–3 3 0.110 0.160 6.00 × 10–3 What is the rate equation for the reaction? A rate = k[D]2 B rate = k[E]2 C rate = k[D]2[E] D rate = k[D][E]2 10 Consider the following equilibrium reaction: 2Al(s) + 3MnSO4(aq) ⇌ Al2(SO4)3(aq) + 3Mn(s) Which of the following gives the correct units for the equilibrium constant Kc? A mol dm-3 B mol-1 dm3 C mol2 dm-6 D mol-2 dm6

5 [Turn over 11 Which of the following statements concerning the equilibrium below is incorrect? 2CrO4 2-(aq) + 2H+(aq) ⇌ Cr2O7 2-(aq) + H2O(l) ∆H = 0 kJ mol-1 A The forward and backward reactions are proceeding at the same rate. B The position of equilibrium shifts to the right with an addition of CrO4 2- ions. C The position of equilibrium shifts to the left with an increase in pH. D The equilibrium constant changes when there is an increase in temperature. 12 Compound X decomposes on heating according to the following equation: 3X(g) ⇌ 2Y(g) + Z(g) When 3 mol of X were put into a 1 dm 3 vessel and heated, the equilibrium mixture contained 0.3 mol of Z. What is the numerical value of the equilibrium constant, Kc? A 0.3×0.32 53 B 0.3×0.62 53 C 0.3×0.62 0.93 D 0.3×0.62 2.13 13 A 1 .00 dm3 solution was made by mixing 0.00400 mol of HC l (aq) and 0.00250 mol of NaOH (aq). What is the pH of the resulting solution? A 2.19 B 2.40 C 2.60 D 2.82

6 14 For the equilibrium, HSO4 –(aq) + HPO4 2–(aq) ⇌ SO4 2–(aq) + H2PO4 –(aq) Which one of the following is a conjugate Bronsted-Lowry acid-base pair? Base Conjugate Acid A HPO4 2– H2PO4 – B HPO4 2– PO4 3– C HSO4 – SO4 2– D HSO4 – HPO4 2– 15 An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element? A Aluminium B Phosphorus C Silicon D Sodium 16 The graph below shows the variation in the boiling points for eight consecutive elements in the Periodic Table, all with atomic number between 10 and 20. Which of the following statements best describes the element based on the graph above? A Element H does not conduct electricity. B Element C forms an acidic oxide. C Element D is in Group V. D Element B has a smaller atomic radius than element C.

7 [Turn over 17 CH3COOCH3 and CH3CH2COOH have the same molecular formula. Which of the following statements about both compounds is correct? A They are cis-trans isomers. B They are structural isomers. C Both compounds react with PCl5 to produce white fumes. D Both compounds contain carboxylic acid functional group. 18 Caffeine is found in coffee. It acts as a stimulant, temporarily warding off drowsiness and restoring alertness. The structure of caffeine is shown below. caffeine Which statement about caffeine is incorrect? A It has a molecular formula C8H10N4O2. B It decolourises cold, dilute alkaline KMnO4. C It contains three sp3 hybridised carbons. D It exhibits cis-trans isomerism. 19 In which of these reactions is the organic product a gas at room temperature and pressure? A Dehydration of ethanol B Esterification of ethanoic acid by ethanol C Oxidation of ethanol D Substitution of ethanol by PCl5.

8 20 Compound Z has the following properties.  Changes acidified potassium dichromate(VI) from orange to green  Produces an orange precipitate with 2,4-dinitrophenylhydrazine Which of the following compounds can Z be? A CH3COCH2COOH B CH3COCH2COCH3 C CH3COCH2CH2OH D CH2(OH)CH2CH2COOH 21 In the 2-step synthesis to convert propan-1-ol to 2-chloropropane, which of the following pairs of sequential reactions is involved? A Elimination, substitution B Elimination, addition C Free radical substitution, oxidation D Substitution, reduction 22 Fluticasone propionate is used to treat asthma. fluticasone propionate Which of the following reagents reacts with fluticasone propionate to give an observable change? A Br2 (aq) B CH3COOH in the presence of concentrated H2SO4 C H2(g), Ni catalyst D Tollen’s reagent

9 [Turn over 23 Salicylic acid has the structure shown below. COOH OH salicylic acid