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Subscriber comments


  • Hi Geoff, I'm planning on doing this practical with my class as it seems a lot simpler than the RSC version I have done before (and we are short on time!). I'm a bit confused as to the role of ethanoic acid here and wonder if you could help...
  • 24 Apr Mike Sugiyama Jones
    Electron configuration
    Thanks for your thoughts Geoff, like you said this is not something that can be resolved here. I do point this out to my students though as it does provide an interesting discussion.
  • 24 Apr Geoffrey Neuss
    Electron configuration
    An interesting discussion Mike which probably cannot be resolved here. As I said, Eric Scerri may be right but I’m not convinced. Jim Clark starts his well reasoned argument by making two statements. 1. “We say that the 4s orbitals have...
  • 24 Apr Mike Sugiyama Jones
    Electron configuration
    Interesting - Jim Clark over at Chemguide seems pretty convinced of Eric's arguments and even links to some journals that I assume provide evidence for the 'sloppy Aufbau'. Just makes me wonder if we should keep teaching the Aufbau principle...
  • 24 Apr Geoffrey Neuss
    Electron configuration
    Hi Mike, I completely agree that sometimes text books get it wrong. For example many oversimplify ionic bonding when it is not necessary (see ) and many completely fail to address what can be an obvious contradiction between “the pH scale...
  • 24 Apr Lucy Mwandawiro
    Fundamentals of organic chemistry
    Thanks Geoffrey. And yes, will be careful with even past papers from a while back. Noted that there are a number of changes.
  • 24 Apr Mike Sugiyama Jones
    Electron configuration
    Hi Geoff, i'd be interested to hear your thoughts on 'The problem with the Aufbau principle' that Eric Scerri mentions in his blog and recently appeared on the RSC website. I noticed that in your slides, it contains the statement 'Notice that...
  • 23 Apr Geoffrey Neuss
    Fundamentals of organic chemistry
    Hi Lucy, In the past there have been quite a few errors in the specimen papers. This is because they do not go through the same amount of rigorous checking that the actual examination papers and markschemes do. There are clearly six electrons...
  • 23 Apr Lucy Mwandawiro
    Fundamentals of organic chemistry
    Hi Geoffrey, we were wondering why the answer to the specimen 2009 HL P1, question 9 How many electrons are used in the carbon - carbon bond in C2H2, is given as B which is 4 and not C which is 6
  • 22 Apr Geoffrey Neuss
    First-row d-block elements
    Shweta, Past IB papers are copyright IB and can be purchased from Follets /
  • 22 Apr Geoffrey Neuss
    Voltaic cells
    Charles, There are worked answers for all the quizzes, tests and short-answer questions etc. The worksheets on the practicals are to help the students understand what they are doing and I assume that their teachers are able to guide them here...
  • 22 Apr Charles Kerr
    Books for enjoyment
    Thanks for the feedback. I understand you provide a lot of information on this site, I just wanted a source that is all in one place. I found a handbook on amazon but this was not electronic. I begin teaching IB Chemistry in August and I...

Resources


Chemistry for the IB Diploma (Oxford IB)

The new edition of the Study Guide (which has sold over 150,000 copies) by Geoffrey Neuss for first exams in 2016.

more info