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)+e−→Cl−(g) and Li(g)→Li+(g)+e−
C. Li+(g)+Cl−(g)→LiCl(s)
D. 12Cl2(g)→Cl(g) and Cl(g)+e−→Cl−(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.