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  • 20 May 2024
    Geoffrey Neuss
    Rates of reaction questions
    Hello Ivan, The question you are referring to looks to be Question 16 on SL N22P1 and Question 18 on the corresponding HL paper. The first three data points form a straight line in which the concentration has decreased from 1.6 to 1.2 mol dm-3...
  • 20 May 2024
    Ivan Perez
    Rates of reaction questions
    Hello,I hove doubts about following, I believe from Nov. 2022 What initial rate of reaction can be determined from the graph? A.  0.1 mol dm−3 s−1B.  0.2 mol dm−3 s−1C.  1.0 mol dm−3 s−1D. ...
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  • 16 May 2024
    Geoffrey Neuss
    R3.2 Electrochemical cells questions
    Hello Alex, Students need to know that a secondary (rechargeable) cell involves reversible redox reactions but from my understanding of R3.2.7 they do not need to memorise specific secondary-cell redox systems as it clearly states "Deduce the...