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 CH