WJEC · GCSE
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Definition of Pure Substances
1Definition of Pure SubstancesRead next2Scientific vs Everyday PurityRead next3Melting Point and PurityRead next4Distinguishing Pure and Impure SubstancesRead next5Elements: Definition and ClassificationRead next6Compounds: Definition and ClassificationRead next7Mixtures: Definition and ClassificationRead next8Formulations and Their UsesRead next9Examples of Formulations in Everyday ProductsRead next10Filtration: Process and ApplicationsRead next11Crystallisation: Process and ApplicationsRead next12Simple Distillation: Process and ApplicationsRead next13Fractional Distillation: Process and ApplicationsRead next14Chromatography: Stationary and Mobile PhasesRead next15Principles of Separation in ChromatographyRead next16Interpreting ChromatogramsRead next17Calculating Rf Values in ChromatographyRead next18Chromatography to Identify PurityRead next19Choosing Appropriate Separation TechniquesRead next20Specified Practical: Determining Melting PointsRead next21Specified Practical: Distillation of LiquidsRead next22Specified Practical: Paper ChromatographyRead next
The Particle Model of Matter
1The Particle Model of MatterRead next2States of Matter and ChangesRead next3Physical vs Chemical ChangesRead next4Limitations of the Particle ModelRead next5Atoms and Empty Space ConceptRead next6Structure of the AtomRead next7Nuclear Radius vs Atomic RadiusRead next8Subatomic Particles OverviewRead next9Relative Charges of Subatomic ParticlesRead next10Relative Masses of Subatomic ParticlesRead next11Why Atoms Have No ChargeRead next12Atomic Number and Mass NumberRead next13Calculating Protons, Neutrons, and ElectronsRead next14Introduction to IonsRead next15Electronic Structure of AtomsRead next16Electron Configurations of First 20 ElementsRead next17Periodic Table and Electron ArrangementRead next18Mendeleev’s Periodic Table DevelopmentRead next19Atomic Weights and IsotopesRead next20Definition of IsotopesRead next21Relative Atomic Mass and IsotopesRead next22Atomic Size and Subatomic ScaleRead next23Using Powers of Ten in ChemistryRead next24Predicting States from Melting and Boiling DataRead next25Examining States Under Given ConditionsRead next
Writing Chemical Symbols
1Writing Chemical SymbolsRead next2Formulae of Simple Covalent CompoundsRead next3Formulae of Ionic CompoundsRead next4Empirical Formula from Atom CountsRead next5Empirical Formula from DiagramsRead next6Law of Conservation of MassRead next7Writing Balanced Chemical EquationsRead next8Writing Half EquationsRead next9Charges on Group 1, 2, 6, and 7 IonsRead next10Formulae of Compounds Using Common IonsRead next11Writing Ionic EquationsRead next12Using State Symbols in EquationsRead next13Calculating Relative Formula MassRead next14Relative Formula Mass in EquationsRead next15Reacting Mass CalculationsRead next16Empirical Formula from Reacting Mass DataRead next17Stoichiometry from MassesRead next18Effect of Limiting ReactantsRead next19Definition of the MoleRead next20Using the Avogadro ConstantRead next21Mass and Moles RelationshipRead next22Calculating Mass from MolesRead next23Calculating Moles from MassRead next24Molar Volumes of GasesRead next25Calculating Gas Volumes from MolesRead next26Gas Volumes in Chemical ReactionsRead next
Structure of the Periodic Table
1Structure of the Periodic TableRead next2Periods and Groups ExplainedRead next3Electronic Structure and ReactivityRead next4Trends in Group 1 ElementsRead next5Reactions of Group 1 Elements with WaterRead next6Reactions of Group 1 Elements with OxygenRead next7Reactions of Group 1 Elements with Group 7 ElementsRead next8Trends in Group 7 ElementsRead next9Displacement Reactions of HalogensRead next10Reactions of Group 7 Elements with IronRead next11Tests for Halide IonsRead next12Trends in Group 0 ElementsRead next13Reactivity of Group 0 ElementsRead next14Properties of Transition MetalsRead next15Uses of Transition Metals as CatalystsRead next16Formation of Coloured Ions in Transition MetalsRead next17Flame Tests for Metal IonsRead next18Tests for Hydrogen GasRead next19Tests for Oxygen GasRead next20Tests for Chlorine GasRead next21Metal vs Non-Metal PropertiesRead next22Predicting Properties Using the Periodic TableRead next23Predicting Reactivity Using the Periodic TableRead next24Instrumental Methods of Chemical AnalysisRead next25Advantages of Instrumental AnalysisRead next26Interpreting Data from Instrumental AnalysisRead next27Specified Practical: Flame Tests and Chemical TestsRead next
Introduction to Ionic Bonding
1Introduction to Ionic BondingRead next2Electrostatic Forces in Ionic BondingRead next3Dot and Cross Diagrams for Ionic BondingRead next4Physical Properties of Ionic CompoundsRead next5Introduction to Covalent BondingRead next6Electron Sharing in Covalent BondingRead next7Dot and Cross Diagrams for Covalent BondingRead next8Physical Properties of Simple Covalent SubstancesRead next9Introduction to Metallic BondingRead next10Sea of Electrons in Metallic BondingRead next11Physical Properties of MetalsRead next12Limitations of Bonding ModelsRead next13Carbon's Ability to Form Multiple BondsRead next14Introduction to Carbon AllotropesRead next15Properties and Structure of DiamondRead next16Properties and Structure of GraphiteRead next17Properties and Structure of FullerenesRead next18Properties and Structure of GrapheneRead next19Energy Transfers in Bonding and State ChangesRead next20Intermolecular Forces and State ChangesRead next21Comparing Atomic and Bulk PropertiesRead next22Introduction to NanoparticlesRead next23Size and Scale of NanoparticlesRead next24Surface Area to Volume Ratio in NanoparticlesRead next25Properties and Uses of Nano-SilverRead next26Properties and Uses of Nano-Titanium DioxideRead next27Risks and Future of NanotechnologyRead next
Definition of Reactivity Series
1Definition of Reactivity SeriesRead next2Reactivity of Metals with WaterRead next3Reactivity of Metals with AcidsRead next4Displacement Reactions of MetalsRead next5Competition Reactions (Thermit Reaction)Read next6Order of Reactivity from ExperimentsRead next7Oxidation and Reduction (Oxygen Transfer)Read next8Oxidation and Reduction (Electron Transfer)Read next9Redox Reactions in DisplacementRead next10Redox Reactions in ElectrolysisRead next11Methods of Metal ExtractionRead next12Position in Reactivity Series and Extraction MethodRead next13Extraction of Iron in the Blast FurnaceRead next14Role of Carbon Monoxide in Iron ExtractionRead next15Formation of Slag in the Blast FurnaceRead next16Electrolysis of Molten Ionic CompoundsRead next17Products at Electrolysis ElectrodesRead next18Predicting Electrolysis Products (Molten State)Read next19Electrolysis for Reactive Metal ExtractionRead next20Extraction of Aluminium from BauxiteRead next21Role of Cryolite in Aluminium ExtractionRead next22Bacterial Metal Extraction (Bioleaching)Read next23Phytoextraction of MetalsRead next24Electrolysis of WaterRead next25Electrolysis of Aqueous SolutionsRead next26Competing Reactions in ElectrolysisRead next27Properties of AluminiumRead next28Properties of CopperRead next29Properties of IronRead next30Properties of TitaniumRead next31Linking Metal Properties to UsesRead next32Tests for Copper(II) Ions in SolutionRead next33Tests for Iron(II) Ions in SolutionRead next34Tests for Iron(III) Ions in SolutionRead next
Reaction of Acids with Metals
1Reaction of Acids with MetalsRead next2Reaction of Acids with BasesRead next3Reaction of Acids with CarbonatesRead next4Writing Equations for Acid ReactionsRead next5Test for Carbon Dioxide GasRead next6Test for Carbonate Ions Using AcidRead next7Acids Dissolving in Water to Form Hydrogen IonsRead next8Alkalis Dissolving in Water to Form Hydroxide IonsRead next9Measuring pH Using IndicatorsRead next10Measuring pH DigitallyRead next11Neutralisation Reactions with BasesRead next12Neutralisation Reactions with CarbonatesRead next13Preparing Soluble Salts from Insoluble BasesRead next14Preparing Soluble Salts from CarbonatesRead next15Titration Method for Preparing Soluble SaltsRead next16Using Titration to Determine Acid and Alkali ConcentrationsRead next17Test for Sulfate Ions Using Barium ChlorideRead next18Hydrogen and Hydroxide Ions Reaction EquationRead next19Dilute vs Concentrated AcidsRead next20Weak vs Strong AcidsRead next21Differences in Reactions of Strong and Weak AcidsRead next22Logarithmic Nature of the pH ScaleRead next23Effect of Hydrogen Ion Concentration on pHRead next24Neutrality, Acidity, and Alkalinity in Terms of Hydrogen Ion ConcentrationRead next25Mass and Moles Relationship in SolutionsRead next26Concentration of Solutions in mol/dm³Read next27Calculating Concentration from Mass and VolumeRead next28Relationship Between Volumes and Concentrations in ReactionsRead next29Preparation of Crystals of Soluble Salts (Specified Practical)Read next30Titration of Strong Acid Against Strong Base (Specified Practical)Read next
Exothermic Reactions
1Exothermic ReactionsRead next2Endothermic ReactionsRead next3Temperature Changes in ReactionsRead next4Reaction Profiles for Exothermic ReactionsRead next5Reaction Profiles for Endothermic ReactionsRead next6Understanding Activation EnergyRead next7Energy Changes in Bond BreakingRead next8Energy Changes in Bond MakingRead next9Calculating Bond Energy ChangesRead next10Chemical Cells and Energy ProductionRead next11How Chemical Cells WorkRead next12Potential Difference in Chemical CellsRead next13Fuel Cells OverviewRead next14Hydrogen-Oxygen Fuel CellsRead next15Advantages of Fuel CellsRead next16Disadvantages of Fuel CellsRead next17Comparing Fuel Cells to Other Energy SourcesRead next18Energy Conservation in ReactionsRead next19Interpreting Energy Profile DiagramsRead next20Specifying Practical: Energy Released by FuelsRead next21Evaluating Energy Changes in Everyday ApplicationsRead next22Social and Environmental Impacts of Energy ProductionRead next23Economic Implications of Energy Use in ChemistryRead next24Graphical Representation of Energy ChangesRead next25Common Exam Traps in Energy CalculationsRead next
Defining Reaction Rate
1Defining Reaction RateRead next2Methods to Measure Reaction RateRead next3Gas Collection Method for Reaction RateRead next4Mass Loss Method for Reaction RateRead next5Precipitation Method for Reaction RateRead next6Interpreting Rate of Reaction GraphsRead next7Effect of Temperature on Reaction RateRead next8Effect of Concentration on Reaction RateRead next9Effect of Pressure on Reaction RateRead next10Effect of Surface Area on Reaction RateRead next11Collision Theory and Reaction RateRead next12Activation Energy and Reaction RateRead next13Role of Catalysts in ReactionsRead next14Identifying Catalysts in ReactionsRead next15Catalysts and Activation EnergyRead next16Enzymes as Biological CatalystsRead next17Reversible Reactions IntroductionRead next18Dynamic Equilibrium DefinitionRead next19Forward and Reverse Reaction RatesRead next20Predicting Equilibrium Position ChangesRead next21Effect of Concentration on EquilibriumRead next22Effect of Temperature on EquilibriumRead next23Effect of Pressure on EquilibriumRead next24Choosing Conditions for Equilibrium ProductsRead next25Practical: Gas Collection Rate InvestigationRead next26Practical: Sodium Thiosulfate Reaction RateRead next27Practical: Catalyst Effect on Hydrogen PeroxideRead next28Examining Reaction Rate Data TrendsRead next29Calculating Reaction Rates from GraphsRead next
Crude Oil as a Hydrocarbon Source
1Crude Oil as a Hydrocarbon SourceRead next2Fractional Distillation of Crude OilRead next3Properties of Alkane FractionsRead next4Cracking of HydrocarbonsRead next5Importance of Hydrocarbons in Modern LifeRead next6Finite Nature of Crude OilRead next7Functional Groups in Organic ChemistryRead next8Homologous Series ConceptRead next9Naming Straight-Chain AlkanesRead next10Drawing Structural Formulae of AlkanesRead next11Properties and Reactions of AlkanesRead next12Naming Straight-Chain AlkenesRead next13Drawing Structural Formulae of AlkenesRead next14Addition Reactions of AlkenesRead next15Combustion Reactions of HydrocarbonsRead next16Functional Groups in AlcoholsRead next17Naming Straight-Chain AlcoholsRead next18Drawing Structural Formulae of AlcoholsRead next19Oxidation of Alcohols to Carboxylic AcidsRead next20Functional Groups in Carboxylic AcidsRead next21Naming Straight-Chain Carboxylic AcidsRead next22Drawing Structural Formulae of Carboxylic AcidsRead next23General Reactions of Functional GroupsRead next24Principles of Addition PolymerisationRead next25Structure of Polymers from Alkene MonomersRead next26Principles of Condensation PolymerisationRead next27Functional Groups in Condensation PolymersRead next28Formation of Small Molecules in Condensation PolymersRead next29DNA as a Natural PolymerRead next30Monomers in DNA StructureRead next31Polymers Based on Sugars and Amino AcidsRead next32Evaluating Environmental Impact of Synthetic PolymersRead next33Social and Economic Implications of Fossil FuelsRead next
The Importance of the Haber Process
1The Importance of the Haber ProcessRead next2Nitrogen, Phosphorus, and Potassium in AgricultureRead next3Drawbacks of Overusing FertilisersRead next4Industrial Production of FertilisersRead next5Laboratory vs Industrial Fertiliser SynthesisRead next6Testing for Ammonia GasRead next7Testing for Ammonium SaltsRead next8Graphs of Reaction Conditions vs RateRead next9Rate vs Equilibrium Trade-Off in IndustryRead next10Factors in Siting Chemical PlantsRead next11Calculating Percentage YieldRead next12Theoretical Yield CalculationsRead next13Defining Atom EconomyRead next14Calculating Atom EconomyRead next15Choosing Reaction Pathways for ProductsRead next16Conditions and Process of CorrosionRead next17Mitigation of CorrosionRead next18Sacrificial Protection Against CorrosionRead next19Composition and Properties of AlloysRead next20Comparing Properties of Different MaterialsRead next21Selecting Materials Based on PropertiesRead next22Principles of Life Cycle AssessmentRead next23Interpreting Life Cycle Assessment DataRead next24Recycling Processes and ViabilityRead next25Factors Affecting Recycling DecisionsRead next26Percentage of Water in Hydrated Salts PracticalRead next
Formation of the Early Atmosphere
1Formation of the Early AtmosphereRead next2Role of Volcanic Activity in Atmosphere FormationRead next3Development of Oxygen in the AtmosphereRead next4Impact of Photosynthesis on Atmospheric OxygenRead next5Composition of the Modern AtmosphereRead next6Greenhouse Effect ExplainedRead next7Enhanced Greenhouse Effect and Global WarmingRead next8Evidence for Human Impact on Climate ChangeRead next9Correlation Between CO2 Levels and Fossil Fuel UseRead next10Effects of Increased CO2 and Methane LevelsRead next11Mitigation Strategies for Climate ChangeRead next12Sources of Carbon Monoxide in the AtmosphereRead next13Sources of Sulfur Dioxide in the AtmosphereRead next14Sources of Oxides of Nitrogen in the AtmosphereRead next15Sources of Particulates in the AtmosphereRead next16Problems Caused by Atmospheric PollutantsRead next17Potable Water DefinitionRead next18Separation Techniques for Potable WaterRead next19Ease of Treating Waste WaterRead next20Groundwater Treatment MethodsRead next21Saltwater Desalination TechniquesRead next22Evaluating Methods to Increase Potable Water AvailabilityRead next23Impact of Air Pollution on Health and EnvironmentRead next24Economic Implications of Pollution MitigationRead next25Role of Peer Review in Climate ScienceRead next26Interpreting CO2 and Temperature GraphsRead next27Using Orders of Magnitude in Climate DataRead next