Thank you for pointing this out John. I've reworded the question.
Printable versions of written tasksR2.3 Awkard sentence structure in question 4 i)"State and explain how the value of the reaction quotient, Q will change after 1.0 mol of ethanol reacts with 0.5 mol of ethanoic acid are mixed." Cheers, John
Printable versions of written tasksThanks for the detailed answer. I totally agree with you that it is absolutely useful to know of different chromatography methods. I just was confused by the HPLC as answer. Thank you for the clarification.
S1.1 Introduction to the particulate nature of matterHi Sascha,The syllabus is rather vague, as in S1.1.1 it just states "solvation, filtration, crystallization, evaporation and chromatography should be covered" without specifying which type(s) of chromatography. Under Tools 1 it does specify that...
S1.1 Introduction to the particulate nature of matterHello there,I was kind of confused that there is only a "simple" chromatography mentioned in the teaching slides but later on in task 4 on slide 12 you need a HPLC to seperate the example b). Therefore my question is if the HPLC is important and...
S1.1 Introduction to the particulate nature of matterHello Briony,I've checked it and it does seem to come to -906 kJ mol-1. There are three lines in the model answer: Heat evolved by combusting 0.553 g = 4.18 x 0.250 x 10.4 = 10.868 kJ M(C2H5OH)...
Experimental work Question 4Hi Geoffry, just wanted to double check you answer for c - we keep getting -940 kJ.mol-1 rather than -906 kJ.mol-1.
Experimental work Question 4Thanks so much for the clarification Paul! Have a great week.
Internal AssessmentMorning MikeI can indeed confirm that error (uncertainty) bars are not required in chemistry (if I understand it correctly, they are in physics). However, it's good to encourage the use of uncertainty bars if appropriate. As the...
Internal Assessment
Travis
Hello, and thanks as always for these great resources. I notice that in the R3 Electron transfer reactions test, there is a question related to factors that affect the amount of product formed in the electrolysis of a molten salt (HL question...
Printable versions of MC Topic tests