RVHS_H2_CHEM_P1_QP Prelim

RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION II CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 23 September 2016 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. 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 your 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. This document consists of 17 printed pages and 3 blank pages.

2 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 For complete combustion of 20.0 g of heptane, what is the minimum volume of oxygen gas required at s.t.p.? A 0.2 dm3 B 2.2 dm3 C 49.3 dm3 D 52.8 dm3 2 Element X exists as 3 different isotopes and has a relative atomic mass of 66.6. Which of the following compositions of isotopes is correct? A 25% 65X, 50% 66X and 25% 67X B 30% 65X, 60% 66X and 10% 67X C 50% 65X, 20% 66X and 30% 67X D 10% 65X, 20% 66X and 70% 67X 3 Which of the following does not contain a singly occupied orbital? A N2+ B S– C Br+ D Sc3+ 4 Dinitrogen tetroxide, N2O4, has a simple covalent structure. Which of the following correctly describes the bonding within the dinitrogen tetroxide molecule?  bond  bond dative bond A 3 2 2 B 5 0 4 C 5 2 2 D 5 4 0

3 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II 5 The Valence Shell Electron Pair Repulsion (VSEPR) theory is used to predict the shapes of molecules. Which shape is correctly predicted by VSEPR? number of bonded electron pairs around central atom number of lone pairs around central atom shape A 2 4 non-linear B 3 2 T-shaped C 4 1 square planar D 3 2 see-saw 6 Equal masses of gaseous N2, NH3 and N2O are injected into an evacuated container to produce a total pressure of 3 atm. How do the partial pressures of N2, NH3 and N2O compare? A pN2 = pNH3 = pN2O B pN2 < pNH3 < pN2O C pNH3 < pN2 < pN2O D pN2O < pN2 < pNH3 7 Use of the Data Booklet is relevant to this question. The enthalpy changes for three reactions are given below: Na(s)  Na(g) H = +107 kJ mol1 H+(aq) + OH(aq)  H2O(l) H = 58 kJ mol1 2Na+(g) + 2H+(aq) + 2e  2Na+(aq) + H2(g) H = 1700 kJ mol1 What is th