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11 Oct 2026
The 2026 Nobel Prize for Chemistry
The Nobel prize for Chemistry this year celebrates the pioneering work of Henri Kagan and Kenso Soai on homochirality - the synthesis of just the required enantiomer of chiral compounds and not the mirror...
11 Sep 2026
The importance of using clear English in IB chemistry
Why using clear English is important when communicating in chemistry. This blog gives examples of two past IB questions where the language used to phrase the questions can lead to different interpretations...
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Subscriber comments
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For Q7. Students have challenged the answer and arguing that I is not a "structural" formula. According to the syllabus, it is named a "skeletal formula" separate from the two types of "structural formula". S3.2.1 Organic compounds...
MC test: S3.2 Functional groups - classification of organic compounds -
Thanks Geoff, I agree that the three distractors are typical exothermic processes, and students who know what they are doing should gravitate towards the nitrogen one, particularly if they are familiar with "tricky" IB questions like these.Regarding...
R1.3 Energy from fuels -
Hello Rafael, I don't think the question is unreasonable. An energy profile is given which shows the reaction is endothermic. The three 'wrong' responses are the formation of the H-H(g) bond from H(g) atoms, the neutralization of NaOH(aq)...
R1.3 Energy from fuels
Geoffrey
Site authorHi Lauren, Your students do have a valid point when considering what is written in S3.2.1. The problem is that skeletal structures (whether full or condensed) are also ways of representing the structural formula as the definition of a structural...
MC test: S3.2 Functional groups - classification of organic compounds