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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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There is a question in Nov 25 (Q16, SL P1A, TZ1) where students were expected to figure out that the combustion of nitrogen to form NO is endothermic. It seems students should do so through a process of elimination, since the other three are classic...
R1.3 Energy from fuels -
UPDATE! This is now possible! See the page "More than one teacher" as to how to...
Using student access -
Thank you very much.
R2.2 Rate of reaction & collision theory
Geoffrey
Site authorHello 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