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  • Hello Austin, Yes - it is intentional. As you correctly say, standard enthalpies of combustion and formation are only specifically mentioned in the AHL part of the syllabus, but R1.1.4 (which is SL and HL) covers "The standard enthalpy change...
  • Hi Geoff,In a lot of these Reactivity 1 questions for HL and SL you've made reference to enthalpies of formation and combustion.  The subject guide lists these under Reactivity 1.2.3 which is AHL material.  Have you done this intentionally?...
  • 13 May 2024
    Geoffrey Neuss
    R2.2 (AHL) Activation energy
    Hi Harprit, Although that equation is no longer given in the data booklet, the linear (logarithmic) form from which it is derived still is.  Section R2.2.13 states "Determine the activation energy and the Arrhenius factor from experimental...
  • 13 May 2024
    Harprit Athwal
    R2.2 (AHL) Activation energy
    Hi Geoff. A quick question here, the ln K1/k2 =.... version of the Arrhenius equation that you have on slide 5 is no longer in the data booklet. I assume that realistically means, students wouldn't be expected to apply that anymore. Is that...