Process
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
Modern Analytical Techniques I
Mass spectrometry
- 3 things to know
- Papers 2 and 3
Overview
The molecular ion peak and reading Mᵣ from it, why isotope peaks can sit at higher m/z, how fragmentation arises and why only positive fragments are detected, the groups lost at 15, 17, 29 and 45, and calculating mass lost to propose a structure.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
In a mass spectrum, a loss of 15 mass units from the molecular ion indicates the loss of which group?
Key term
What does the molecular ion peak (M⁺) in a mass spectrum represent?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does the molecular ion peak (M⁺) in a mass spectrum represent?
Model answer
The intact molecule that has lost one electron.
- 2
What does the molecular ion peak tell you about Mᵣ?
Model answer
Take the m/z at the molecular ion peak; that value is Mᵣ.
- 3
How is an organic compound's relative molecular mass read off a mass spectrum?
Model answer
Read the m/z value of the molecular ion peak, which is typically the peak at highest m/z (excluding isotope peaks).
- 4
Why might the molecular ion peak not be the absolute highest m/z peak in a mass spectrum?
Model answer
Because isotope peaks (such as those containing ¹³C) may appear at slightly higher m/z values than the main molecular ion peak.
- 5
Explain how fragmentation patterns arise in mass spectrometry.
Model answer
The molecular ion breaks apart into smaller positively charged fragments and neutral species.
- 6
Why do only some fragments from the molecular ion appear as peaks in the mass spectrum?
Model answer
Only positively charged fragments are detected; neutral species are not recorded.
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