There are quite a few updates to various A-level guides just uploaded. I have labelled the updated files. They are mostly minor changes. Good luck with the revision for this year’s exams.
I have quite significantly enlarged the guides for the calculation topics for the AQA, OCR and Edexcel. It is mostly more worked examples of different sorts of possible calculations.
These are the updated files
OCR 2.1.4 acids
Edexcel 5. formulae equations and amount
If you are looking for questions to do you will find them on the text book page
I have put together a set of revision guides for the 2018 new AQA GCSE chemistry. They are in syllabus order, which is not the order I teach the course but when it comes to final revision will be the most useful order. It is very much a first draft for these and no doubt they will change over time. Find the page here
People have kept asking for a guide on the practicals. As I have explained before I am not producing one. It is worth remembering paper 3 is only partially practical based. There will be multiple choice questions and short answer questions on all parts of the syllabus. There are no short cuts. You need to know everything practical or non practical. It is not going to be an easy paper.
You will need to know the 12 required practicals but you will also get questions on other practicals which may be unfamiliar.
Practical questions could be about:
- write the method for a common practical
- draw diagrams of common apparatus
- create a method for an unusual experiment
- suggest improvements to a given method
- state why a step in a method is done
- draw graphs, take gradients and make conclusions from given results
- see if results confirm a given hypothesis
- give expected observations for a reaction
- write chemical equations that match observations given
- describing causes of common errors
- explain how errors could be minimised
- explain what effect errors might have on the result
The 12 required practicals for AQA are given below with the relevant revision guides where I have mentioned them. For some I have included brief methods where I think they are needed but not all. You should refer to your practical work for the full methods or the AQA practical handbook.
2 Measurement of an enthalpy change see 1.4 revision guide energetics
Consider – neutralisation reactions, solution plus solid and combustion reactions
3 Investigation of how the rate of a reaction changes with temperature see 1.5 Kinetics
Usually sodium thiosulphate and acid –the result from this experiment can be used to work out activation energy see 1.9 Rate Equations
4 Carry out simple test-tube reactions to identify:
- cations – Group 2, NH4+ see 2.2 Group 2
- anions – Group 7 (halide ions), OH–, CO3 2–, SO42– see 2.2 Group 2 and 2.3 Halogens
- by an initial rate method – generally ‘clock reactions’ or timing how long it takes for a cross to disappear
- by a continuous monitoring method- generally following with a gas syringe, but could be titration of samples or colorimeter
8 Measuring the EMF of an electrochemical cell see 1.11 Redox Equilibria
9 Investigate how pH changes when a weak acid reacts with a strong base and when a strong acid reacts with a weak base see 1.12 revision guide acid base equilibria
10 Preparation of:
- a pure organic solid and test of its purity see 3.9 revision guide carboxylic acids and derivativesand 3.14 revision guide organic synthesis
- a pure organic liquid see 3.14 revision guide organic synthesis for purification steps
11 Carry out simple test-tube reactions to identify transition metal ions in aqueous solution see 2.5 Transition Metals and 2.6. Reactions of Inorganic Compounds in Aqueous Solution
Other important experiments commonly asked about in the past that could still well come up:
Simple measuring mass and gas volume experiments such a heating a hydrated salt or measuring the Mr of a volatile liquid see 1.2 revision guide calculations
Colorimeters see 2.5 Transition Metals
Redox titrations and EDTA titrations see 2.5 Transition Metals
Autocatalysis reaction see 2.5 Transition Metals
Measuring an equilibrium constant for an esterification reaction 1.6 revision guide equilibria
Comparing rates of hydrolysis of halogenoalkanes see 3.3 Halogenoalkanes
Any test tube reaction from inorganic or organic part of syllabus
Calculating uncertainties and safety see 1.2 Calculations
A few updates (mostly to AQA notes). Some students have been asking for a practical revision guide. I will not be producing one at the moment. I took the decision to integrate the practical notes into the relevant chapters with the linked theory, and I think this is the best way to approach the practical material. The AQA paper 3 will be a combined practical and synoptic theory paper.
I have done some updates to practical material though, notably in 1-6-revision-guide-equilibria where I have included extensive notes on the practical measuring kc. This is not actually a required practical but it has been a favourite in the past on AQA practical papers. I have also included notes on solving equilibrium constant equations algebraically which I think are going to appear on the new exams (although not with quadratic equations).
I have changed terminology in 1-2-revision-guide-calculations to use uncertainty instead of error.
The other chapters I have changed have been labelled with (updated February 2017)
I have also produced a aqa-mechanisms-a-level-summary for the new syllabus
I have put the old legacy guides back for those doing retakes because I have had many requests.
Everyone currently studying in present yr 12 and yr 13 should be doing the new syllabus. They are all up to date and complete.
I’ve uploaded some AQA revision guides on the missing topics on amino acids and chromatography. I have also made some minor changes to other topics in line with the first set of new AS exams.