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  • Thank you for spotting this Radhika - I've corrected it now.
  • In q 4  hcl is limiting so hydrogen should be half of mole of hcl..?
  • 5 June 2024
    Geoffrey Neuss
    R1.1 Measuring energy changes
    Hello Xiaodan, I think you have put it very well and are correct. Students intuitively realise that energy needs to be put in to break a chemical bond but it is less obvious that the same amount of energy is given out when the same bond is...
  • 5 June 2024
    Xiaodan Wang
    R1.1 Measuring energy changes
    Dear Geoffery,Thank you for the resources and thought-provoking questions! I also agree the enthalpy diagram can be misleading to students but for different reasons. Please hear me out and let me know if I am correct/incorrect. The y-axis is...