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Almost all aspects of life are engineered at the molecular level, and without understanding molecules we can only have a very sketchy understanding of life itself.

Francis Henry Compton Crick (1916 - 2004)
Francis Henry Compton Crick (1916 - 2004)
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"Hi fellow chemistry teachers. I am leaving IB this year but ABSOLUTELY recommend that you lobby your coordinators and administrators to get access to this site. It is something I wish i had done/been aware of and done YEARS ago. Geoff makes things easily..."

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Greengate School

"The InThinking Chemistry website by Geoffrey Neuss is a valuable resource. The presentations are useful and supplement my course textbook by giving students tasks throughout to check their understanding. The topic introductions provide points of interest..."

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Tamagawa Academy K-12 & University

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  • Paul

    Site author
    30 Sep 2026

    Hi John Yes, that's correct.And I can confirm that the guide, Reactivity 3.2.2, says: Deduce redox half-equations and equations in acidic or neutral solutions. I believe candidates might be asked to balance a...

    R3.2 Oxidation & reduction

  • John

    30 Sep 2026

    HI,  On this, can I confirm that in neutral conditions, they should write half equations using H+/H2O and that they do not need to use H2O/OH- at all when creating half equations (as basic conditions are not part of spec)? Thanks, John

    R3.2 Oxidation & reduction

  • Susan

    28 Sep 2026

    Thanks for your advice. I have put up a case on IB Answers

    R2.2 Rate of reaction & collision theory

  • Demet

    23 Sep 2026

    Thank you!

    R3.1 Neutralization reactions

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