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Every great advance in science has issued from a new audacity of imagination. What are now working conceptions, employed as a matter of course because they have withstood the tests of experiment and have merged triumphant, were once speculative hypotheses.
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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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Canadian International School
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International School of Lesotho
Subscriber comments
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Hello Geoffrey, We have received feedback on our IA's from May2026. Between us, we have a long history of teaching the course and usually have our grades accepted, or amended by +/-1. This year, all of our students were marked down by...
Internal Assessment -
Hello Doreen, The assessment of a student's EE is based both on the product and on the process. The external examiner has the actual essay to evaluate the product but of course was not present in any of the discussions between the supervisor...
Criterion E -
Hi, I do not understand how teacher's input in the RPF form may affect student's performance for criterion E.
Criterion E
Geoffrey
Site authorHi Sian, Replying to questions on how IA marks have been arrived at (usually why they have been lowered) by external moderators is something I find difficult to do, particularly as I have not seen the actual work being assessed. InThinking...
Internal Assessment