ACSI 2021 Y6 Prelim Paper 2_QP

1 Anglo-Chinese School (Independent) YEAR 6 PRELIMINARY EXAMINATION 2021 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 2 Monday 13th September 2021 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. For examiner’s use Qn 1 /12 Qn 2 /8 Qn 3 /9 Qn 4 /11 Qn 5 /6 Qn 6 /11 Qn 7 /12 Qn 8 /7 Qn 9 /7 Qn 10 /7 Wrong s.f. /units Total /90 ________________________________________________________________________ This question paper consists of 20 printed pages including this cover page. Candidate Full Name: Candidate Number:

2 Answer all questions. Write your answers in the boxes provided. 1. (a) Sir James Jeans, who was a great populariser of science, once described an atom of carbon consisting of six bees buzzing around a space the size of a football stadium. (i) Explain, in terms of an atom of carbon, what stopped the bees from flying away from the space of the football stadium. [1] ................................................................................................................................... ................................................................................................................................... (ii) State one inadequacy in Jeans’ description when applied to an atom of carbon. [1] ................................................................................................................................... ................................................................................................................................... (b) The graph shows a sketch of the first ionisation energies of seven consecutive elements in Period 2 and 3 of the Periodic Table. The letters are not the symbols of the elements. (This question continues on the following page) First ionisation energy / kJ mol−1 A B C D E F G H I J

3 (Question 1 continued) (i) Explain why the first ionisation energy of C is much lower than that of B. [2] ................................................................................................................................... ................................................................................................................................... ......................................................................