InThinking is a great organisation. I got my first category training with them and it was one extremely useful to my teaching. In addition, the website is highly in line with the training and the IB curriculum and also very helpful. It is such a blessing...

Dina Sonbol, American International School in Egypt, Egypt

As we begin a new syllabus in Chemistry, this website has been a place to gain insight and to share ideas. This website guides my planning and delivery of lessons. The links to TOK and the learner profile suggestions help me make meaningful connections...

Melanie Kells, Canadian International School, India

The InThinking Chemistry Website will be of value to any IB Chemistry teacher. The website is packed full of resources including worksheets and topic tests with answers. The comments about teaching each topic and experimental work are helpful.

Toby Dowling, North London Collegiate School, UK

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Today’s Google doodle

8 February 2019

The beans in the 'G' of Google’s doodle today give the clue.A few details about a relatively unknown chemist who is celebrated by Google today.... more

An 1885 version of Mendeleev’s table

20 January 2019

You never know what might be lurking underneath your lecture theatre. A wallchart of the periodic table was found at St. Andrew’s University... more

Subscriber comments

  • 12 Feb Geoffrey Neuss
    4. Chemical bonding & structure (2)
    Hi Nicholas, See the answer that I gave on 15 January on the HL page I'm sure the IB would not expect students to know that the bond angle is more than 109o as it would appear to go against VSEPR theory which (as I have explained in the Pause...
  • 12 Feb Nicholas Pinkerton
    4. Chemical bonding & structure (2)
    Hi Geoffrey, I have a question about the hydronium ion bond angle from question 10. How best to explain the angle being different to the expected value of less than 109.5 degrees? I looked at some research from Jian Tang and Takeshi Oka, and...
  • I find to be excellent for looking at 3D molecular models.
  • 11 Feb Geoffrey Neuss
    Analysis of aspirin tablets
    Hi Sarah, Basically because aspirin thins the blood generally and also causes an increased risk of stomach bleeding. Several recent reports (e.g. / ) also suggest that the risks associated with taking a daily dose of aspirin to prevent heart...
  • 11 Feb Sarah Regli
    Analysis of aspirin tablets
    Hey Geoffrey, In the safety section you wrote, "You might like to consider why many doctors now recommend that you take paracetamol rather than aspirin for a headache even though aspirin is an effective mild analgesic." I'm wondering if you...
  • 8 Feb Geoffrey Neuss
    'Scaffolding' the investigation
    Hi Adrian, The IB addresses this question specifically in the answer given to Question 35 in the FAQs document - "There is a 12 page limit but there is no automatic penalty for going over. However, the communication criterion specifies the...
  • 8 Feb Adrian THOMPSON
    'Scaffolding' the investigation
    Hello Geoff, I'm guessing this question has been asked before but some doubt is creeping into my and my students' minds. I have some well-written investigations which overrun with 1 page of references. Would this be automatically penalised...
  • 8 Feb Geoffrey Neuss
    Mandatory laboratory components
    Babsye, There is no requirement for students to maintain such a list. As their teacher you can ask them to do it if you wish but the only list the IB may ask to see is the form 4/PSOW which should be kept by the school.
  • 8 Feb Bapsye Abraham
    Mandatory laboratory components
    Dear Geoffery, Do students maintain a list of the labs they do in class along with hours.?If yes where do they maintain this?Should this list tally with the the PSOW form the teacher maintains?will it be required during 5year...
  • Thanks a ton.
  • 7 Feb Maja Holm
    Uncertainty & error answers
    Thanks :)
  • 7 Feb Harprit Athwal
    Covalent structures (2)
    Thanks, that is very much how I pitched it to them.


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