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IB Approved Workshops
Chemistry: A focus on internal assessment
IB DP Category 3

Online (IB Approved), 21 - 23 March 2025
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Chemistry
IB DP Category 2

Stockholm, Sweden, 2 - 4 May 2025
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Chemistry
IB DP Category 2

Barcelona, Spain, 29 - 31 August 2025
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Virtual Think-Ins
Internal Moderation of IAs across the DP Science Department

Virtual Think-In, 28 February 2025
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Subscriber comments

Mark
Printable versions of written tasks
Thank you for your clarifications, Geoff.
16 Feb 2025
Geoffrey
Printable versions of written tasks
Hello Mark,Percentage error involves division and multiplication and the IB take on this is laid out on page 77 of the TSM. Probably it is best to play safe and give the answer 0.092+/-0.002 mol dm−3 as the uncertainty is just slightly more than...
15 Feb 2025
Mark
Printable versions of written tasks
On a slightly different theme, the HL version of paper 1B carries 35 marks while the SL version carries 25 marks. To what extent are the 10 extra marks on the HL paper related to questions on HL content? 
15 Feb 2025
Mark
Printable versions of written tasks
Hello Geoff. Many thanks for generating sample questions for paper 1B. I have a question regarding sample 7 of the experimental work. In part (f), the absolute uncertainty is quoted to 2 sig figs. My understanding is that absolute uncertainties should...
15 Feb 2025
Geoffrey
R3.2 Electrochemical cells
Hello Daniel, Yes, if cell convention is followed then the left-hand half-cell is undergoing oxidation (i.e. forms the anode) and the right-hand half-cell is undergoing reduction. So in questions where students are asked to deduce which species...
13 Feb 2025
Daniel
R3.2 Electrochemical cells
Dear Geoffrey, you are absolutely right. Redox chemistry is one of the most confusing chapters since there is a lot of inconsistency in the information given. In acid-bases the conjugates are always written according to „acid/base“ (e.g. HCl/Cl-). For...
13 Feb 2025
Geoffrey
HL Practice Paper 1 (Section A) (3)
Hi Lerina, Thanks for spotting that typo. I've corrected it now.
12 Feb 2025
Lerina
HL Practice Paper 1 (Section A) (3)
Hello Geoffrey, Please check the answer description of q. no. 17  'Which reaction will be spontaneous at low temperatures but non-spontaneous at high temperatures?'    Option B and D will have positive entropy...
12 Feb 2025
Paul
Evaluation
Hi Iffat,Just to add to what Geoff points out. Candidates may well in one sense refer to 'strengths' in the data when justifying their conclusion. Conclusion, 5-6, first strand: A conclusion is justified that is relevant to the research...
11 Feb 2025
Geoffrey
Evaluation
Hello Iffat, If you look carefully at the assessment criteria you will see that 'strengths' do not appear. Evaluation is now only concerned with the weaknesses and limitations associated with the methodology and suggested improvements - see...
11 Feb 2025
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