Hi Geoff, I was wondering if we can still access the old site as it used to be. With the 2014 syllabus and all the tests that came along with it.
Major changes for the 2023 programmeHello again Justyna,Thank you for identifying the question. It is essentially the same mistake as the one in the M2025 paper. Part d(i) asks students to write the equation for the complete combustion of ethanol. Since it is only for one mark the...
The subject report and errors in the exam papersHi Goeff, Thank you for your answer. These were items 6.d (i) and (ii) on the May 2023 TZ2 HL Paper 2, which were not related to the previous items. In item 6 (ii), "Determine the enthalpy change for the combustion of ethanol, in kJ mol−1, using...
The subject report and errors in the exam papersHi Justyna,I'm not sure exactly which question you are referring to but I guess it depends upon the wording of the question. If the question clearly is referring to the standard enthalpy of combustion of ethanol then both the...
The subject report and errors in the exam papersHi Goeff, In what state of matter should water, which is a product of ethanol combustion, be in the reaction equation if the conditions during combustion are not specified? In Task 6 of the 2023 TZ2, this question arose, and students often wrote...
The subject report and errors in the exam papersHi ManiFor a good discussion and explanation see "On the Origin of the Blue Colour in The Iodine/Iodide/Starch Supramolecular...
R2.2 (AHL) Rate expression & reaction mechanismHello, This a question about the starch-iodine/iodide complex. There seem to be different theories of what exactly creates the blue color. Any thoughts?
R2.2 (AHL) Rate expression & reaction mechanismHi Maria, You are missing something! Question 11. Gives the information "The total enthalpy change for the reaction is −596 kJ mol−1. This is for 1 mol of Li2O not 2 mol of Li2O so the equation needed...
S2.1 The ionic modelHello. I think I have spotted a mistake in exerices 2.1 Data response questions on ionic bonding. Reaction equation is not balanced correctly: We should have four lithium atoms reacting with one oxygen molecule. So all the further questions...
S2.1 The ionic model
Geoffrey
Site authorHello Charmaine,Many of the tests and questions on the old site from the 2014 syllabus were updated and used alongside new questions for the current syllabus. The old multiple choice questions for each topic and sub-topic (892 questions in total)...
Major changes for the 2023 programme