SAJC_H1_CHEM_P1_QNS

1 ST ANDREW’S JUNIOR COLLEGE JC2 Preliminary Examination Chemistry Higher 1 8872/01 Paper 1 Multiple Choice 19 September 2016 50 minutes Additional Materials: Multiple Choice Answer Sheet, Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are 30 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 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 13 printed pages including this page.

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 Use of the Data Booklet is relevant to this question. How many carbon atoms are there in 11.5 g of ethanol? [L = Avogadro Constant] A 𝐿 4 B 𝐿 2 C L D 2L 2 Use of the Data Booklet is relevant to this question. CFC-150a is a molecule that is widely used as solvents for plastic, oils and fats as well as a fumigant in insecticide sprays. The percentage composition by mass of CFC-150a is: C, 24.2%; H, 4.1%; Cl, 71.2%. Which structural formula could be that of CFC-150a? A CH3Cl B CH2Cl2 C CH3CCl3 D CH2ClCH2Cl 3 When sodium iodide is added to concentrated sulfuric acid, the following reaction took place. NaI + H2SO4 HI + NaHSO4 (A) The hydrogen iodide produced would then react with concentrated sulfuric acid in the following series of reactions. 2HI + H2SO4 I2 + 2H2O + SO2 (B) 6HI + H2SO4 3I2 + 4H2O + S (C) 8HI + H2SO4 4I2 + 4H2O + H2S (D) Which of the above reaction shows the greatest change in oxidation number for sulfur?

3 4 Use of the Data Booklet is relevant to this question. P and Q are elements in the same period. P has more protons than Q. The 1st ionisation energy of P is lower than Q. P has one less unpaired electron than Q. What are the identities of P and Q? P Q A aluminium Magnesium B fluorine Boron C oxygen Nitrogen D sodium Silicon 5 Which solid has more than one type of chemical bond? A calcium nitrate B magnesium sulphide C Potassium D silicon dioxide 6 The diagram below shows the structure of compound R. compound R Which of the following set of bond angles are in compound R? A 90°, 120°, 180° B 105°, 109°, 120° C 105°, 107°, 120° D 107°, 109°, 180°

4 7 Consider the following four compounds with similar molecular mass. 1. CH3CH2CH2CH