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  • 10 June 2024
    Austin Dwyer
    R1 What drives chemical reactions?
    Hi Geoff,In question 16, you've given one of the options in relation to the change in dipole moment.  In the new syllabus, IR spectroscopy is no longer covered in the Standard Level course and the specification for R1.3.3 links to AHL...
  • 8 June 2024
    Geoffrey Neuss
    R2 (HL) Equilibrium (2)
    Hello Helena, Thank you for your kind comment on the latest edition of my Study Guide. I'm glad you and your students are finding it so helpful.On page 102, the equation ΔG = ΔG⦵ + RTlnQ is being used to show how the value of ΔG changes...
  • 7 June 2024
    Helena Van Lindert
    R2 (HL) Equilibrium (2)
    Dear Geoffrey, On pg. 102 of your excellent IB guide, I may be mistaken, but reading under Gibbs energy change and equilibrium constant' , but if Q is 0 lnQ=1, does that not make DG= DG(Standard) + RT, instead of DG= DG(Standard). Kind...
  • Thank you for spotting this Radhika - I've corrected it now.