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The InThinking Chemistry website has been a great resource to have. The multiple choice tests have been invaluable in diagnostic marking and the guides to each subtopic, along with their discussions of common pitfalls, have helped to guide and improve...

Richard Young, British International School of Cairo, Egypt

This is my first year of full-time teaching, and I would not have survived so far without the vast pool of resources available on the InThinking Chemistry site. From teacher prep notes to lab suggestions to last-minute homework assignments to understandings...

Rebecca Weber, International Academy of Macomb, USA

This has been a survival guide and good inspiration for lessons.

Magdalena Tsavkova, Vienna International School, Austria

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"Diamonds Are Forever"

2 August 2017

Chemistry sometimes takes some strange twists and turns. Recently I learned of a rather bizarre connection between the part of sub-topic 4.3... more

Great timing!

29 May 2017

Last month, on the 21st. April 2017 to be precise, the UK experienced the first day since 1882 when all the electricity generated in the country... more

Drinking water from sea-water

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

Subscriber comments


  • Hi Darkul, Half-life, which has the units of time, e.g. seconds, is not the same as rate which has the units of concentration over time, e.g. mol dm-3 s-1. If you integrate the first order rate expression d[A]/dt = k[A] it gives kt = ln[Ao]...
  • Hi Geoffrey. It is clear that if changing the concentration of a reactant has no effect on the rate of reaction that should be a zero order reaction (question 1). Why then in question 2 "Since the half-life is independent of the concentration...
  • 21 Sep Geoffrey Neuss
    Internal Assessment
    Hi Shalini, It seems to me that this in itself could be a great area to explore for an IA. The enthalpies of combustion of the pure components can easily be found in the literature. Then assuming complete miscibility the student could find...
  • 21 Sep SHALINI SHARMA
    Internal Assessment
    Dear Geoffrey, Hope things are fine at your end. I need your help with one question- How to calculate enthalpy of combustion of mixtures? I referred many sites but none talks of mixture. One of the teachers told that find the enthalpy change...
  • 21 Sep Geoffrey Neuss
    pH curves questions
    Hi Chris, I think there is really quite a grey area here. I have not given hard buffer calculations as they are obviously not on the syllabus. However question 1 helps students to understand the actual shape of pH curves (which clearly is on...
  • 21 Sep Christopher Holbrook
    pH curves questions
    Hello Geoff Many of the problems here appear to be beyond the current syllabus. Buffer calculations should be used in Q1b and Q3 and in Q8/9 explanations of acidic/basic salts are required. These are not explicit in my reading of the syllabus....
  • 20 Sep Geoffrey Neuss
    MC test: Strong & weak acids & bases
    Thanks Darkul - I've corrected the typo now.
  • 20 Sep Geoffrey Neuss
    MC test: Reacting masses & volumes
    Thanks for pointing it out Thomas - it is corrected now.
  • 20 Sep Darkul Tiyessova
    MC test: Strong & weak acids & bases
    There is a typo in question 8: "pKa = 7.1 x 10−8" should be "Ka = 7.1 x 10−8".
  • 19 Sep Thomas Szartowicz
    MC test: Reacting masses & volumes
    Dear Mr. Neuss We would like to inform you that there is unfortunately a mistake in one of the questions above. It is of our concern that you kindly recheck the silver chloride reaction question, seeing as we believe that there is an extra...
  • Hi Lorena, The question asks how they can be separated into their individual components. If a salt solution evaporates you will lose the water. By condensing the water using distillation the water can be collected and the salt left behind....
  • 16 Sep Lisa Gallegos
    Topics 5 & 15
    Disregard the question was in my textbook not on your test and I am pretty sure it is a typo. Sorry

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