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 Blogmore

Metallic hydrogen

Friday 10 February 2017

Back in 1989 Martin Fleischmann and Stanley Pons claimed to have achieved cold fusion. Cold fusion is the fusion of two small nuclei occurring... more

Carbon atoms can bond to more than four other carbon atoms

Monday 16 January 2017

“Each carbon atom can only bond to a maximum of four other carbon atoms.” This well known and seemingly incontrovertible axiom of organic... more

Updated periodic table

Friday 23 December 2016

Since the IB data booklet for first use in the May 2016 examination session came into existence there have been several updates as mistakes... more

Subscriber comments


  • 20 Feb Darkul Tiyessova
    First row d-block elements questions
    Hi Geoff, is there any purpose why in question 4 for the 4th IE in data for sub-questions (a) and (b) the superscript 1 is given? Thank you in advance.
  • 16 Feb Geoffrey Neuss
    Synthetic routes questions
    Hi Cindy, You say "when you add it to everything else" but in fact there is no new material in this sub-section. This is the key to covering it as it simply uses the reactions that have already been covered in the earlier sections for Topics...
  • 16 Feb Cindy Powell
    Synthetic routes questions
    Dr. Neuss. I am wondering your thoughts on this section. I know you'll have to give the IB politically-correct answer but this section is so difficult especially when you add it to everything else. I don't want to tell my students to ignore...
  • 16 Feb Geoffrey Neuss
    Oxidation & reduction
    Hello Darren, I’m not a great fan of using oxidation states for organic compounds. It is particularly pointless talking about oxidation states of classes of compounds as it depends upon what other functional groups may or may not be present....
  • 16 Feb Oula Akawi
    Equilibrium law
    Thank you, for all your hard work!
  • 16 Feb Darren Hornell
    Oxidation & reduction
    Hi Geoff I was reviewing a students IA and they have referenced the following Kahn Academy video: at 1:15 on the video they discuss oxidation states, and say that the oxidation state of C in a primary alcohol is -1, I work it out to be -2,...
  • 15 Feb Manuel Hatzi
    First-row d-block elements
    Thanks Geoffrey. The wonders of quantum theory are still mostly wonders to me.
  • 15 Feb Geoffrey Neuss
    Energy sources questions
    Yes, Chris, it should be specific energy - thanks.
  • 15 Feb Christopher Holbrook
    Energy sources questions
    Hello Geoff In question 2 you state that wood has an energy density of 15000 kJ.kg-1. Don't you mean specific energy going by the units?
  • 15 Feb Geoffrey Neuss
    Equilibrium law
    Hello Oula, You are missing nothing! I made a mistake which I have now corrected. Thanks for pointing it out.
  • 15 Feb Oula Akawi
    Equilibrium law
    Hello Geoff, For task 2, ammonia is the product yet when you do the calculation you subtract its entropy value (where it should be reactants). What am I missing? why is this the other way around?
  • 15 Feb Geoffrey Neuss
    First-row d-block elements
    It is a good question Manuel although the answer is probably way beyond IB level. It is not just iron, nickel and cobalt that show ferromagnetism, other substances such as certain alloys and rare earth elements (see my blog on neodymium bucky...

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