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Date May 2009 Marks available 1 Reference code 09M.1.hl.TZ2.19
Level HL Paper 1 Time zone TZ2
Command term Determine Question number 19 Adapted from N/A

Question

Which step(s) is/are endothermic in the Born-Haber cycle for the formation of LiCl?

A.     12Cl2(g)Cl(g) and Li(s)Li(g)

B.     Cl(g)+eCl(g) and Li(g)Li+(g)+e

C.     Li+(g)+Cl(g)LiCl(s)

D.     12Cl2(g)Cl(g) and Cl(g)+eCl(g)

Markscheme

A

Examiners report

In this question which referred to the Born-Haber cycle for the formation of LiCl, two respondents stated that the question was confusing especially for ESL candidates. In fact, the 68% of candidates got the correct answer, namely A and it was not felt that the wording of the question would have posed any problem even for ESL candidates.

Syllabus sections

Additional higher level (AHL) » Topic 15: Energetics/thermochemistry » 15.1 Energy cycles
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