TJC_H2_CHEM_P1_QN Prelim

1 2015 TJC H2 Chemistry Preliminary Examinations [Turn over CHEMISTRY 9647/01 Paper 1 Multiple Choice 18th September 2015 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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 you r 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 21 printed pages. Write your name and Civics Group Write and shade your index number

2 2015 TJC H2 Chemistry Preliminary Examinations [Turn over Section A For each question, there are four possible answers, A, B, C and D . Choose the one you consider to be correct. 1 Incomplete combustion of y dm3 of butane, C 4H10, yielded a mixture of carbon dioxide and carbon monoxide in the ratio of 3:1, together with water vapour. What is the volume of oxygen consumed? A 5y dm3 C 9y dm3 B 6y dm3 D 12y dm3 2 0.005 mol of a metal oxide, Y2Ox, reacted exactly with 0.006 mol of acidified potassium manganate(VII) solution. The half-equation for the reduction of MnO4 – is shown below. MnO4 – + 8H+ + 5e–  Mn2+ + 4H2O Given that the oxidation state of Y in the product is +6, what is the value of x? A 1 C 3 B 2 D 4 3 Use of the Data Booklet is relevant to this question. Significant contributions to carbon dioxide levels in the atmosphere comes from the thermal decomposition of limestone (calcium carbonate) and the manufacture of cement and lime (calcium oxide). Cement works roast 1000 million tonnes of limestone per year and a further 200 million tonnes is roasted in kilns to make lime. What is the total annual mass output of carbon dioxide (in million tonnes) from these two processes? A 440 B 528 C 660 D 880 4 Which of the following species has three unpaired electrons? A Al B Ti3+ C Zn2+ D Cr3+

3 2015 TJC H2 Chemistry Preliminary Examinations [Turn over 5 Which of the following describes a phenomenon which cannot be explained by hydrogen bonding? A Ethanoic acid molecules form a dimer when dissolved in benzene.