ACSI 2019 Y6 Prelim Paper 2_QP

1 Anglo-Chinese School (Independent) YEAR 6 PRELIMINARY EXAMINATION 2019 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 2 Wednesday 18th September 2019 2 hours 15 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Write your candidate session number in the box above. • 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. • If you use additional sheets of paper for your answer, attach them to the booklet. Indicate the question number clearly on these sheets. 0 0 2 3 2 9 For examiner’s use Qn 1 /5 Qn 2 /5 Qn 3 /9 Qn 4 /10 Qn 5 /11 Qn 6 /7 Qn 7 /12 Qn 8 /8 Qn 9 /15 Qn 10 /8 Wrong s.f. /units Total /90 Candidate Session Number ________________________________________________________________________ This question paper consists of 22 printed pages including this cover page.

2 Answer all questions. Write your answers in the boxes provided. 1. The lines in the ultraviolet emission spectrum of hydrogen gas converge at 9.12 × 10−8 m. (a) Calculate the ionization energy of hydrogen in kJ mol−1. [2] ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... (b) Sketch on the energy-level diagram below showing the transition that corresponds to the convergence limit that leads to the line with the shortest wavelength in the hydrogen emission spectrum. [1] (This question continues on the following page) wavelength / × 10−8 m Limit 1st line 9.12 9.72 10.26 12.16 Energy n = ∞ n = 7 n = 6 n = 5 n = 4 n = 3 n = 2 n = 1

3 (Question 1 continued) (c) Explain why the convergence limit in the visible spectrum is not used to calculate the ionization energy. [2] ................................................................................................................................... ................................................................................................................................... .............................................................................................