Numbers
Edexcel A-Level Chemistry 9CH0
Atomic Structure and the Periodic Table
Bonding and Structure
Inorganic Chemistry and the Periodic Table
Topic overviewFlame tests and how they workThermal decomposition of nitrates and carbonatesCarrying out flame tests and testing the gasesGroup 2 elements and their compoundsTrends in Group 7 and predicting fluorine and astatineHalogen displacement reactionsDisproportionation and the reactions of chlorineHalides with concentrated sulfuric acid, and the hydrogen halidesTesting for halide ions with silver nitrateTesting for carbonate and hydrogencarbonate ionsTesting for sulfate and ammonium ions
Formulae, Equations and Amounts of Substance
Topic overviewThe mole, molar mass and empirical formulaThe ideal gas equation and molar volumeEquations, concentration and reacting quantitiesStandard solutions, titration and uncertaintyPercentage yield, atom economy and acid reactionsCore practicals 1 to 3Empirical formula and water of crystallisation by experimentApparatus, uncertainty and mathematical skills
Organic Chemistry I
Topic overviewFormulae, homologous series and functional groupsIUPAC nomenclatureTypes of organic reaction and structural isomerismStereoisomerism and E/Z nomenclaturePractical techniques in organic chemistryAlkanes, crude oil and combustion pollutantsRadical substitutionAlkenes, the double bond and hydrogenationElectrophilic addition, Markovnikov's rule and the test for an alkeneAddition polymers and waste polymersNucleophilic substitution of halogenoalkanesRates of hydrolysis and the SN1 and SN2 mechanismsClassifying and oxidising alcoholsAlcohols: practical techniques and the core practicals
Modern Analytical Techniques I
Energetics I
Kinetics I
Equilibrium I
Acid-Base Equilibria
Energetics II
Redox II
Transition Metals
Topic overviewElectron configuration and what makes a transition metalComplex ions, ligands and the colour of transition metal ionsCoordination number, monodentate ligands and the shapes of complexesBidentate and multidentate ligands, and ligand exchangeVanadium and chromium chemistryReactions with sodium hydroxide and ammoniaCobalt and copper complexesLigand exchange, amphoteric behaviour and the chelate effectTransition metals as catalysts
Kinetics II
Organic Chemistry II
Topic overviewChiralityAldehydes, ketones and their oxidationReduction and nucleophilic addition of HCNTesting for a carbonyl group: 2,4-DNPH and the iodoform reactionCarboxylic acids and their reactionsEsters and acyl chloridesReflux, extraction and recrystallisationDistillation, melting temperature and working safely
Organic Chemistry III
Topic overviewThe structure of benzene and the evidence for itElectrophilic substitution of benzeneNitration, halogenation, Friedel-Crafts and phenolAmines: structure and basicityReactions of amines and preparing themAmides and condensation polymersAmino acids, zwitterions and proteinsEmpirical and molecular formulae from analytical dataGrignard reagents and multi-step synthesisPurification techniques and the aspirin preparation
Redox II
- 4 subtopics
- 12 things to know
- Papers 1 and 3
What Redox II covers
Covers standard electrode potentials and the hydrogen electrode, building and measuring electrochemical cells, using E° values to predict feasibility, and the storage cells, fuel cells and redox titrations that apply them.
Where it is assessed
Papers 1 and 3
Advanced Inorganic and Physical Chemistry, then the synoptic paper.
Check the Pearson Edexcel specification ↗The 4 subtopics
Each one has its own page.
- Standard electrode potentials and the hydrogen electrodeRecall questions on the standard conditions, on the construction of the standard hydrogen electrode, and on why a reference electrode is needed at all.Open →
- Electrochemical cells, emf and cell diagramsCalculating the standard emf of a cell, which electrode is positive and where oxidation and reduction occur, the salt bridge, writing and reading conventional cell diagrams such as the zinc and copper cell, and assembling electrochemical cells to measure their voltage.Open →
- Feasibility, the electrochemical series and disproportionationRecall questions on predicting the direction of a redox reaction from E° values, on the limits of that prediction, and on identifying disproportionation from the series.Open →
- Storage cells, fuel cells and redox titrationsStorage and fuel cells, the hydrogen-oxygen fuel cell electrode reactions with acidic and alkaline electrolytes, the lead–acid cell's emf, discharge and recharging, lithium cells, and manganate(VII) and iodine-thiosulfate titrations with their equations, end points and calculations.Open →
What you need to know
Answer each one before you reveal it.
Your recallNot started
Process
How do electrode potentials predict a reaction?
Key term
Define oxidation in terms of oxidation number.
Numbers
How is the standard emf of a cell calculated from two standard electrode potentials?
Key term
In a conventional cell diagram, what does a single vertical line represent?
Key term
How can non-standard conditions limit predictions made from standard electrode potentials?
Process
How does a fuel cell generate a voltage?
Key term
Write the electrode reaction at the positive electrode of a hydrogen-oxygen fuel cell with an acidic electrolyte.
Key term
Define oxidation in terms of electrons.
Key term
In a cell, which electrode is the positive electrode?
Key term
How do standard electrode potentials tell you whether a reaction is feasible?
Key term
What is a storage cell?
Take Redox II further
The same content, four other ways.
Commonly confused
Pairs that lose marks when they are blurred together.
Anode vs Cathode
Anode: electrode where oxidation occurs. Cathode: electrode where reduction occurs.
Standard electrode potential vs Cell emf
Standard electrode potential: potential measured relative to the standard hydrogen electrode. Cell emf: potential difference between two half-cells.
Fuel cell vs Storage cell
Fuel cell: device continuously supplied with fuel and oxidant. Storage cell: rechargeable device retaining reactants internally.
Questions from this topic
Each one with the model answer underneath.
- 1
Define oxidation in terms of electrons.
Model answer
Oxidation is the loss of electrons.
- 2
Define reduction in terms of electrons.
Model answer
Reduction is the gain of electrons.
- 3
Define oxidation in terms of oxidation number.
Model answer
Oxidation is an increase in oxidation number.
- 4
Define reduction in terms of oxidation number.
Model answer
Reduction is a decrease in oxidation number.
- 5
What is meant by the standard electrode potential of a half-cell?
Model answer
The voltage of that half-cell measured relative to the standard hydrogen electrode under standard conditions.
- 6
State the three standard conditions used when measuring standard electrode potentials.
Model answer
A temperature of 298 K, a gas pressure of 100 kPa, and ion concentrations of 1.00 mol dm⁻³.
What is inside Levo
Six ways to work the same material.
Redox II revision questions
- What does Redox II cover in Edexcel A-Level Chemistry?
- 4 subtopics: standard electrode potentials and the hydrogen electrode, electrochemical cells, emf and cell diagrams, feasibility, the electrochemical series and disproportionation and storage cells, fuel cells and redox titrations. Each one has its own page with questions and model answers.
- How is Redox II organised?
- By the Edexcel 9CH0 specification, subtopic by subtopic, so it matches the order you are taught it in.
Every question in Redox II, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
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