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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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Hello, A student of mine is considering as a possible idea for her EE: a study of the effect of varying D-glucose concentrations on the intial reaction rate and peak absorbance of hemoglobin -catalysed phenolphthalein- hydrogen peroxide oxidation,...
Resources -
Hello Harprit, R2.3.4 gives X(g) ⇌ X(aq) as an example so I guess students could be asked to explain why a bottle of carbonated water fizzes when the top is removed from the bottle and then eventually goes flat if the top is left off.
R2.3 The extent of chemical change -
Hello Geoff, In R2.3.4, the IB guide talks about Le Chatelier's Principle to physical equilibria and gives a (g) / (aq) as an example. A very old IB question came up looking at a (l) / (g), and what happens when you increase the volume of liquid....
R2.3 The extent of chemical change
Harprit
Thanks. Any thoughts on questions on (l)/(g) equilibria? It's not explictily in the syllabus and you also can't just always apply LCP in the same way.
R2.3 The extent of chemical change