Evaluation
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
Formulae, Equations and Amounts of Substance
Standard solutions, titration and uncertainty
- 3 things to know
- Papers 1, 2 and 3
Overview
The steps for making up a standard solution, calculating percentage uncertainty and percentage error, random and systematic errors, accuracy against precision and concordant titres, and comparing a result's percentage error with its total percentage uncertainty.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Evaluation
State the formula for calculating percentage error.
Key term
Define a standard solution.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Define a standard solution.
Model answer
A standard solution is a solution of accurately known concentration.
- 2
What is the first step in preparing a standard solution?
Model answer
Accurately weigh the required mass of solid using a balance.
- 3
After weighing the solid for a standard solution, what is done next?
Model answer
Dissolve the solid in a small volume of distilled water in a beaker.
- 4
When preparing a standard solution, how is the dissolved solid transferred to the volumetric flask?
Model answer
Transfer the solution to a volumetric flask, rinsing the beaker to ensure all solute is transferred.
- 5
How is the final volume achieved when preparing a standard solution?
Model answer
Add distilled water to the volumetric flask up to the graduation mark.
- 6
What is the final step after making up to the mark when preparing a standard solution?
Model answer
Stopper and invert the flask to mix thoroughly.
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