BlogSee all

Subscriber commentsSee all

  • 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...
  • 13 May 2024
    Geoffrey Neuss
    R3.1 (AHL) Buffer solutions questions
    Thank you for spotting this Ashley - you are quite right and I've corrected the answer now.