RI_H1_CHEM_P1_QP

RAFFLES INSTITUTION 2015 YEAR 6 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 28 September 2015 50 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. 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 to be correct and record your choice with a soft pencil on the separate Answer Sheet. 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. This document consists of 12 printed pages. © Raffles Institution 2015 8872/01/S/15 [Turn over

2 © Raffles Institution 2015 8872/01/S/15 Section A There are thirty questions in this section. For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct and record your choice in soft pencil on the OMR sheet provided. 1 Azomethane, CH 3N2CH3, is a pale yellow liquid with a low boiling point. At elevated temperatures, azomethane decomposes into nitrogen and ethane gas. If 20 cm 3 of gaseous CH 3N2CH3 is completely decomposed, what is the total volume of gaseous products formed? [All volumes are measured at the same temperature and pressure.] A 50 cm3 B 40 cm3 C 25 cm3 D 10 cm3 2 Use of the Data Booklet is relevant to this question. Dickite, a clay-like material used as a coating for high-quality bond paper, has the following composition. SiO2: 46.54% Al2O3: 39.50% H2O: 13.96% The empirical formula of Dickite is SiwAlxHyOz. What is the value of z? A 13 B 9 C 4 D 2 3 Use of the Data Booklet is relevant to this question. A sample of 3-chloroprop-1-ene was heated with a halogen-containing reagent and compound X was formed. The relative molecular mass of X was determined to be 157.4. What was the reagent used? A HBr(g) B HCl(g) C Br2(g) D Cl2(g) 4 Which of the following elements would be expected to form the largest ion with a noble gas electron configuration? A Aluminium B Calcium C Chlorine D Sulfur

3 © Raffles Institution 2015 8872/01/S/15 5 Naturally occurring iron consists of various isotopes. Two ions formed by the isotopes are shown below: Fe2+ 26 54 Fe2+ 26 56 Which one of the following statements is correct? A Fe2+ 26 54 has a smaller ionic radius than Fe2+ 26 56 . B The electron configuration of both Fe2+ ions is 1s22s22p63s23p63d64s2. C When subjec