Key term
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
Inorganic Chemistry and the Periodic Table
Thermal decomposition of nitrates and carbonates
- 3 things to know
- Papers 1 and 3
Overview
The products of heating Group 1 and Group 2 nitrates and carbonates, the lithium nitrate and lithium carbonate exceptions, the increase in thermal stability down each group, and how cation charge density and polarisation of the anion explain why Group 2 compounds decompose more readily.
What you need to know
Answer each one before you reveal it.
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Key term
How does the weakening of bonds within an anion affect the decomposition temperature of the compound?
Key term
State the products formed when a typical Group 1 nitrate (other than lithium nitrate) is heated.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State the products formed when a typical Group 1 nitrate (other than lithium nitrate) is heated.
Model answer
The metal nitrite and oxygen gas
- 2
What type of compound is formed from the metal when sodium nitrate decomposes on heating?
Model answer
Sodium nitrite (a metal nitrite)
- 3
Why is lithium nitrate considered an exception among Group 1 nitrates in terms of thermal decomposition?
Model answer
It decomposes to form lithium oxide, nitrogen dioxide and oxygen, rather than forming a nitrite
- 4
State the three products formed when lithium nitrate is heated.
Model answer
Lithium oxide, nitrogen dioxide and oxygen
- 5
State the products formed when a Group 2 nitrate is heated.
Model answer
The metal oxide, nitrogen dioxide and oxygen gas
- 6
What gaseous products are released when calcium nitrate decomposes on heating?
Model answer
Nitrogen dioxide and oxygen
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