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  • 16 May 2024
    Alex McQuillian
    R3.2 Electrochemical cells questions
    Hi Geoff,I’m teaching standard level rechargeable cells in R3.2 and I’m unsure if students need to memorise the oxidised and reduced species at the anode and cathode e.g. Carbon—Zinc cell, Zn/Zn2+ and MnO2/MnO(OH), electrolyte NH4Cl....
  • 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...