ACSI 2022 P2 Final (QP)

Anglo-Chinese School (Independent) Year 6 Preliminary Examination 2022 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 2 Monday 12th September 2022 2 hours 15 minutes INSTRUCTIONS TO CANDIDATES • Write your candidate number in the box above. • Do not open this examination paper until instructed to do so. • Answer all questions. • A calculator is required for this paper. • A copy of the Chemistry Data Booklet is required for this paper. • Write your answers in the boxes provided. • The maximum marks for this examination paper is 90 marks. Candidate Number Candidate Full Name Class 6. This question paper consists of 23 printed pages, including the cover page. For examiner’s use Qn 1 /7 Qn 2 /13 Qn 3 /19 Qn 4 /12 Qn 5 /9 Qn 6 /12 Qn 7 /18 Wrong s.f. /units Total /90

2 Answer all questions. Write your answers in the boxes provided. 1. Copper is one of the most commonly used metal and exists in two oxidation states, +1 and +2. Mass spectroscopic analysis of a sample of copper gave the following results: % abundance 63Cu+ 69.17 65Cu+ 30.83 (a) Calculate the relative atomic mass of copper to two decimal places. [2] (b) State the number of protons, neutrons and electrons in the 65Cu2+ ion. [1] Number of protons: Number of neutrons: Number of electrons: (c) State the full electron configuration of the Cu+ ion. [1] (This question continues on the following page)

3 (d) Explain why, when ligands bond to the copper(II) ion causing the d–orbitals to split, the complex is coloured. [2] (e) If it takes 1.24  10−18 J of energy to eject an electron from the surface of copper metal, calculate the longest possible wavelength, in nm, of light that can ionize the metal. [1]

4 2. (a) Elements show trends in their physical properties across the Periodic Table. (i) Explain why the first ionization energy of oxygen is lower than the first ionization energy of nitrogen. [2] (ii) Explain why the atomic radius decreases across period 3, from sodium to chlorine. [2] (b) Dinitrogen monoxide, N 2O, causes depletion of ozone in the stratosphere. The Lewis (electron dot) structure of dinitrogen monoxide molecule can be represented as: Lewis structure I (i) Draw two other possible Lewis (electron dot) structures of dinitrogen monoxide with central atom N. [2] Lewis structure II Lewis structure III (This question continues on the following page) •• •• •• ••

5 (ii) Using formal charge, predict which Lewis structure I, II or III is preferred. Give a reason for your answer. [2] (iii) State and explain the shape of the dinitrogen monoxide molecule. [1] (This question continues on the