2017 HCI H1 Chemistry Prelims P1 Questions

This document consists of 11 printed pages (including this cover page) HWA CHONG INSTITUTION Preliminary Examinations Higher 1 NAME CT GROUP 16S CHEMISTRY Paper 1 Multiple Choice 8872/01 20 September 2017 Additional Materials: Data Booklet Optical Mark Sheet (OMS) 50 minutes INSTRUCTIONS TO CANDIDATES: Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Centre number and index number on the Answer Sheet in the spaces provided. Complete the information on the optical mark sheet (OMS) as shown below. 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 OMS. 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.

2 2017 HCI Preliminary Examination H1 Chemistry Paper 1 Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. Which one of the following has the same number of particles as one mole of magnesium atoms? A the number of ions in 2 dm 3 of 0.25 mol dm─3 of aqueous hydrochloric acid B the number of delocalised electrons in one mol of copper metal C the number of atoms in 71 g of chlorine gas D the number of ions in 58.5 g of sodium chloride 2 What mass of carbon dioxide will be formed by the complete combustion of 4.00 g of butan-1-ol? A 2.38 g B 3.03 g C 9.51 g D 12.1 g 3 The percentage by mass of water in a hydrated manganese(II) chloride salt is 36.4%. What is the empirical formula of the hydrated salt? A MnCl 2.2H2O C MnCl2.4H2O B MnCl2.3H2O D MnCl2.5H2O 4 Which of the following has the same electronic configuration as the chloride ion, Cl─? A Ca2+ B Na+ C Ne D F¯ 5 In which of the following reactions is the underlined element being reduced? A NH3 + HCl  NH4Cl B H2O2 + 2I¯ + 2H+  2H2O + I2 C 2V3+ + H2O2  2VO2+ + 2H+ D CaCO3  CaO + CO2

3 2017 HCI Preliminary Examination H1 Chemistry Paper 1 6 When heated, solid iodine forms iodine vapour. What does this information suggest about the nature of the particles in these two physical states of iodine? solid vapour A ionic atomic B ionic molecular C molecular atomic D molecular molecular 7 Hydrazine, N2H4, is useful as a rocket fuel. It has some properties that are similar to those of ammonia, NH3. hydrazine Why are hydrazine molecules more soluble in water than ammonia molecules? A There are more van der Waals' forces between hydrazine and water than between ammonia and water. B There are more hydrogen bonds between hydrazine and water than between ammonia