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Wish I had subscribed to this site years ago. Great materials, examples and explanations. Definitely worth it!

Jeff Hinton, Greengates School, Mexico

Hi fellow chemistry teachers. Iam leaving IB this year but ABSOLUTELY recommend that you lobby your coordinators and administrators to get access to this site. It is something I wish i had done/been aware of and done YEARS ago. Geoff makes things easily...

Jeff Hinton, Greengate School, Mexico

Great resourses and teaching tips. I swear by this site

Katie Woodcock, Sir James Henderson School, Italy


Drinking water from sea-water

Sunday 9 April 2017

Back in 2010 I wrote a blog, “Sticky tape and a pencil”, about the award of the Nobel Prize (for Physics) to scientists at Manchester University... more

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

Subscriber comments

  • 28 Apr Geoffrey Neuss
    Electrochemical cells (AHL)
    Thanks for your kind comments about both the website and the Study Guide Tim. Your students are quite correct there is a typo in the answer as the Ag+ and the Ag have got switched round. It should be Cl2(aq) + 2Ag(s) = 2Cl-(aq) + 2Ag+(aq)....
  • 28 Apr Geoffrey Neuss
    pH scale
    Hi Tim, Yes, it should be 3, not 4. See my reply under -
  • 28 Apr Timothy Sisson
    pH scale
    Hi Geoff, In the study guide, page 69 Acids and Bases SL, question 2a,(ii). Given that the pH from part (i) is 2 and there has been a *10 dilution should the pH not then be 3, rather than 4 as stated in the answers on page 185? Tim
  • 28 Apr Timothy Sisson
    Electrochemical cells (AHL)
    Hello Geoff, Firstly thank you for creating and maintaining such a useful resource, I use it all the time.and find it incredibly helpful. Many of my students use the study guide written by yourself. There are a few questions that they have...
  • 27 Apr Geoffrey Neuss
    7. Equilibrium
    Thanks for this Malak. I think you are correct so I have altered it to isolated system.
  • 27 Apr Malak Issa
    7. Equilibrium
    Hi Geoff, I'm wondering about question 2. In the new Pearson textbook in topic 5, they define a "closed" system as one which allows the transfer of energy but not matter as opposed to an isolated system, which does not allow the transfer of...
  • 27 Apr Geoffrey Neuss
    Rate expression & reaction mechanism
    Hirva, In the past questions have been set both ways round. Sometimes students are given a possible mechanism and asked to comment on it, i.e. based on the rate equation deduce the slow step etc.; at other times they have been asked to suggest...
  • 27 Apr Geoffrey Neuss
    Error & uncertainty
    Hi Vera, The treatment of quantitative uncertainties is generally simpler in Chemistry than in Biology (and Physics, where error bars on graphs are used). I suggest that as well as looking at the TSM you also read the Chief Examiner's Report...
  • 27 Apr Vera Pereira
    Error & uncertainty
    Hi Geoff, I am both a Chemistry and Biology IB teacher and I have a couple of questions about the analysis of uncertainties on the Chemistry IA. - how should students address the uncertainty of an average value (obtained from various trials...
  • 27 Apr Madhuri Sarangdhar
    Thank you so much Geoffery!
  • Hi Geoffrey Does student need to know the reaction mechanisum .and come up with intermediate equation in exam or they will provide the all the equation and determine the rate of reaction. Please advised my student having exam soon . Regardshirva
  • 24 Apr Geoffrey Neuss
    Lipids questions
    Dear Xiaodan, Question 1 d) does not ask for the IHD. To answer 1 e) you need to know that the triester contains 9 C=C double bonds which you can get from the structure. There are indeed a total of 12 double bonds in the triester but three...


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