"The distinction between the SN1 and SN2 mechanisms is not required." Hello, I just wanted to point out that the Guide specifically states: "Distinguish between the concerted one-step SN2 reaction of primary halogenoalkanes and the two-step...
R3.4 Electron-pair sharing reactionsAs I said it is debatable Bonginkhosi. The difference between sand and an alloy is that the different components in sand are not an integral part of the crystal lattice of the substance. You can remove any soluble salts from sand by adding water and...
SL Practice Paper 1 (Section A) (2)Thank you for your quick response Geoffrey. One might also argue that it would be just as difficult, if not harder, to separate sand into it's chemical components
SL Practice Paper 1 (Section A) (2)Hi Bonginkhosi, You ask a good question! I think it is debatable as, unlike in mixtures such as sand, the atoms of the different elements in the alloy are bonded to each other and the mixture cannot be separated into its constituent elements by simple...
SL Practice Paper 1 (Section A) (2)Just a quick question about question 1. Aren't alloys mixtures by definition? The description on Structure 2.4.3 says, "Alloys are mixtures of a metal and other metals or non-metals." Did the definition change or am I missing something?
SL Practice Paper 1 (Section A) (2)Thanks Geoffrey. It's always good to get another perspective on the possibilities for different ways in which students might be asked to apply understanding from different topics/units of study to solve problems. (In fact, this is exactly what 'problem...
Printable versions of MC Topic testsHello Katy, You need to go to the page that covers the AHL material. You can find all you need at R2.3...
Short-answer questions: R2.3 The extent of chemical change - EquilibriumHello, I was looking for questions related to R 2.3.5 - 2.3.7 for HL questions for the exam but lots is missing. Is there any chance to add questions? Thank you.
Short-answer questions: R2.3 The extent of chemical change - EquilibriumHi Travis, I did think carefully before writing this question. In the past it would have started with something like "An electric current was passed through two cells connected in series....". Connecting cells in series is no longer on the...
Printable versions of MC Topic tests
Matthew
Hi Geoff and Paul, Am I right in thinking that Q7 and 8 here are HL content only? I can see how they can perhaps apply knowledge of weak acid definitions with knowledge of K in general, but they did stump my students!
MC test: R3.1 Strong and weak acids & bases