Yes! It is now working. Thank you:) And thanks for all the descriptions on how to get there. The new format is going to take a while to get used to, but I think it is much better. Different sections of the website are easier to get to!
Using qBankHello Amy, Apologies for this - I'm not sure how it happened but the qBank quiz for R2.2 (AHL) Rate expression/reaction mechanism should now be showing the correct ten questions.
Using qBankI would like to set a quiz for my students on R2.2 (AHL) Rate expression/reaction mechanism (10). However, when I select this topic the 10 questions that appear are for R2.2 Activation energy. Can you check that this section is working correctly...
Using qBankThank you Austin. You are correct to relate the colour of the mixture to the concentration of NO2, not the amount present. The amount of NO2 present will decreases when the volume decreases, however its concentration will increase...
MC test: R2.3 The extent of chemical change - EquilibriumIn question 7 reducing the volume of the flask will initially increase concentration causing the mixture to become darker, but then as the equilibrium is re-established the mixture will become lighter (as per your explanation). However, the...
MC test: R2.3 The extent of chemical change - EquilibriumThank you for the quick reply. Yes, the use of polystyrene is not a problem.
Extended Essays (First assessment 2027)Hello Mani, Although I was the principal Examiner for Chemistry Extended Essays for many years I can only give you my personal take on this. If you are still concerned, then you should get your IB coordinator to check officially with the...
Extended Essays (First assessment 2027)Hello, A student is exploring the thermal decomposition of polystyrene with CaO, concentrations are low and fume hood is being used. However, recent internet search results have shown the possibility of formation of toluene and ethylbenzene. Will...
Extended Essays (First assessment 2027)When exam time comes around each year teachers (and students) often find additional problems with the previous year's exam questions as it is can be the first time the questions have been properly scrutinized. This Question 22 is not well worded...
The subject report and errors in the exam papers
Ferawati
Please kindly check MCQ question paper R.1 for SL question number 1 regarding the equation for photosynthesis. The equation for option D (which is the answer) has no oxygen on the product's side.
Printable versions of MC Topic tests