| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.hl.TZ0.17 |
| Level | HL | Paper | 1 | Time zone | TZ0 |
| Command term | Determine | Question number | 17 | Adapted from | N/A |
Question
Which ionic compound has the most endothermic lattice enthalpy?
A. Sodium chloride
B. Sodium oxide
C. Magnesium chloride
D. Magnesium oxide
Markscheme
D
Examiners report
This question was thought to be “ambiguous as lattice energy can be defined as an exothermic or endothermic process”. Students should be familiar with the idea of lattice energy as an endothermic process as that is how it is described in the IB Chemistry Data Booklet. A similar question was set in May 2011, TZ2.
This was the fourth hardest question, being scored correctly by 55.81%. The other answers were fairly evenly spread between A, C and B (in that order).
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