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
Equilibrium II
- 2 subtopics
- 6 things to know
- Papers 1 and 3
What Equilibrium II covers
Covers partial pressures and the equilibrium constant Kp, and which conditions change its value and which only move the position of equilibrium.
Where it is assessed
Papers 1 and 3
Advanced Inorganic and Physical Chemistry, then the synoptic paper.
Check the Pearson Edexcel specification ↗The 2 subtopics
Each one has its own page.
- Partial pressures and KpRecall questions on mole fraction and partial pressure, on writing a Kp expression, and on the units it takes.Open →
- Calculating Kp and the effect of conditionsFinding equilibrium amounts to calculate Kc and Kp, working out their units, why only temperature changes the value of K and how it moves for exothermic and endothermic reactions, and what a large K says about the position of equilibrium.Open →
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Which conditions alter the value of an equilibrium constant?
Key term
What is the partial pressure of a gas in a mixture?
Key term
What information is needed to calculate Kc from experimental data?
Key term
What do the partial pressures of all the gases in a mixture add up to?
Key term
For an exothermic forward reaction, what happens to Kc or Kp when temperature is increased?
Take Equilibrium II further
The same content, four other ways.
Commonly confused
Pairs that lose marks when they are blurred together.
Partial pressure vs Total pressure
Partial pressure: contribution one gas makes to the mixture pressure. Total pressure: sum of all gaseous contributions.
Questions from this topic
Each one with the model answer underneath.
- 1
What is the partial pressure of a gas in a mixture?
Model answer
The pressure that the gas would exert if it alone occupied the container.
- 2
How is the mole fraction of a gas calculated?
Model answer
By dividing the number of moles of that gas by the total number of moles of gas present.
- 3
How is the partial pressure of a gas calculated from its mole fraction?
Model answer
By multiplying the mole fraction of the gas by the total pressure.
- 4
What do the mole fractions of all the gases in a mixture add up to?
Model answer
1.
- 5
What do the partial pressures of all the gases in a mixture add up to?
Model answer
The total pressure.
- 6
What is the equilibrium constant Kp expressed in terms of?
Model answer
The equilibrium partial pressures of the gases.
What is inside Levo
Six ways to work the same material.
Equilibrium II revision questions
- What does Equilibrium II cover in Edexcel A-Level Chemistry?
- 2 subtopics: partial pressures and kp and calculating kp and the effect of conditions. Each one has its own page with questions and model answers.
- How is Equilibrium II organised?
- By the Edexcel 9CH0 specification, subtopic by subtopic, so it matches the order you are taught it in.
Every question in Equilibrium 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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