Hi Demet, The question and quiz pages are under the teacher's control and set to "OFF" by default in case you want to give them as a test etc. You need to turn them to "ON" so that your students can access them directly themselves . You can...
HL Practice ('mock') papers and questionsHi, This page does not allow my kids to access, could you please help? SL practice work but HL not. Thanks
HL Practice ('mock') papers and questionsThanks for pointing this out Lauren. I've corrected the typo in both the SLand HL papers.
SL Practice Paper 2 (2)Hello Geoff, The mark scheme for 1 c i, has a slight error: atom economy = 64.52/98.98 x 100 = 63.9% [1] Should be: atom economy = 64.52/100.98 x 100 = 63.9% [1] It may also be an error in the HL version of this...
SL Practice Paper 2 (2)Hi Nicholas, The question requires the calculation of the standard Gibb’s energy, ΔG⦵ in kJ, for the reaction, between two mol of sulfur dioxide and one mol of oxygen to produce two mol of sulfur...
HL Practice Paper 2 (3)I believe the units for 2(b)(i) should be kJ mol-1 :)
HL Practice Paper 2 (3)The rate constant is temperature dependent so changing the temperature will affect the time taken for the starch-iodide complex to form. This is covered in R.2.2...
R2.2 (AHL) Rate expression & reaction mechanismThanks for spotting this Emmet. I've also removed it from the online version now.
Short-answer questions: R2.3 The extent of chemical change - EquilibriumOne last q. - to find order, how important is it to maintain temperature? Order of bisulphite seems to be 1 for some, 2 for some. So I am trying to analyse all the limitations. Doing it closer to the AC, doing to next to a sunny window...
R2.2 (AHL) Rate expression & reaction mechanism
Chloe
Hi All, I am just wondering if people are still teaching bond orders? It is ambiguous in the syllabus statement yet there was a question in the Pearson textbook in 2.2.11 Q36 which had solutions referring to bond order. Is that...
S2.2 (AHL) The covalent model (1)