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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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Hi, I have a quick question about Task 1.2 on slide 10. The marking scheme gives a Δt value of 18 s, whereas my students read it as approximately 20 s from the graph. Given that the scale is not very precise, would 20 s be considered an acceptable...
R2.2 Rate of reaction & collision theory -
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Internal Assessment -
Hi Margarita, The information you require about two students collaborating to obtain their data is on pages 74-75 in the 2023 guide. This has changed since the previous syllabus where collaboration was not allowed. Essentially you must...
Internal Assessment
Geoffrey
Site authorHello Sandra, When the graph is quite small and particularly if the slope is not that steep there is bound to be some uncertainty when measuring the gradient. What is important is that students understand how to obtain the gradient and...
R2.2 Rate of reaction & collision theory