OCR•J248•Gateway Science
OCR GCSE Chemistry A
7 sections · 216 revision notes, with key terms, exam tips and past papers
Starts with CM1.1i Structural Representations.
Specification
Read OCR’s specification (PDF) (opens in a new tab)
What’s on each paper: Paper 1 (Foundation) · Paper 2 (Foundation) · Paper 3 (Higher) · Paper 4 (Higher)
Paper 1 (Foundation) or Paper 3 (Higher)
Topic C1 Particles
The particle model · Atomic structure11 notes
C1.1 The particle model
Topic C2 Elements, compounds and mixtures
Purity and separating mixtures · Bonding · Properties of materials48 notes
C2.1 Purity and separating mixtures
- CM2.1i Quantitative Calculations
- CM2.1ii Significant Figures
- CM2.1iii Rearranging Equations
- CM2.1iv Empirical Formulae Calculations
- C2.1a Defining Purity
- C2.1b Melting Point Analysis
- C2.1c Relative Formula Mass
- C2.1d Deducing Empirical Formulae
- C2.1e Formulations and Mixtures
- C2.1f Separation Techniques
- C2.1g Chromatography Techniques
- C2.1h Phases in Chromatography
- C2.1i Interpreting Chromatograms
- C2.1j Selecting Purification Methods
- C2.1k Chromatography Applications
C2.2 Bonding
- CM2.2i Scale Estimation
- CM2.2ii Structural Representations
- CM2.2iii Data Translation
- C2.2a Metals vs Non-Metals
- C2.2b Structure and Periodic Position
- C2.2c Electronic Structure and Periodicity
- C2.2d Bonding Types and Structures 5 notes
- C2.2e Electrostatics in Bonding
- C2.2f Dot and Cross Diagrams
- C2.2g Model Limitations
- C2.2h Reactivity and Electronic Structure
- C2.2i Development of the Periodic Table
C2.3 Properties of materials
- CM2.3i 3D Chemical Representations
- CM2.3ii Atomic Scale Relations
- CM2.3iii Scale Estimation
- CM2.3iv Standard Form with Nanoparticles
- CM2.3v Ratios in Surface Area
- CM2.3vi Calculating Geometry
- C2.3a Carbon Bonding
- C2.3b Carbon Compounds Diversity
- C2.3c Carbon Allotropes
- C2.3d State Changes and Bonding Forces
- C2.3e Predicting States of Matter
- C2.3f Bulk Properties of Materials 2 notes
- C2.3g Nanoscale Dimensions
- C2.3h Surface Area to Volume Ratio
- C2.3i Properties and Uses of Nanoparticles
- C2.3j Risks of Nanoparticles
Topic C3 Chemical reactions
Introducing chemical reactions · Energetics · Types of chemical reactions · Electrolysis40 notes
C3.1 Introducing chemical reactions
- CM3.1i Quantitative Arithmetic
- CM3.1ii Standard Form with Avogadro
- CM3.1iii Significant Figures
- CM3.1iv Unit Conversions
- C3.1a Chemical Formulae
- C3.1b Writing Balanced Equations
- C3.1c Periodic Table Formulae
- C3.1d Deducing Compound Formulae
- C3.1e Ionic Equations
- C3.1f State Symbols
- C3.1g The Avogadro Constant and the Mole
- C3.1h Mass and Moles Relationship
- C3.1i Law of Conservation of Mass
- C3.1j Mass Changes in Reactions
- C3.1k Stoichiometry and Limiting Reactants
- C3.1l Calculating Masses from Equations
C3.2 Energetics
C3.3 Types of chemical reactions
- CM3.3i Quantitative Calculations
- C3.3a Redox: Oxygen Transfer
- C3.3b Redox: Electron Transfer
- C3.3c Acids and Alkalis Ions
- C3.3d Neutralisation Reactions
- C3.3e Ionic Neutralisation
- C3.3f Reactions with Acids
- C3.3g Acid Strength and Concentration
- C3.3h pH Scale
- C3.3i Hydrogen Ions and pH
- C3.3j Logarithmic pH Scale
- C3.3k Measuring pH
Paper 2 (Foundation) or Paper 4 (Higher)
Topic C4 Predicting and identifying reactions and products
Predicting chemical reactions · Identifying the products of chemical reactions15 notes
C4.1 Predicting chemical reactions
C4.2 Identifying the products of chemical reactions
Topic C5 Monitoring and controlling chemical reactions
Monitoring chemical reactions · Controlling reactions · Equilibria37 notes
C5.1 Monitoring chemical reactions
- CM5.1i Standard Form with Avogadro
- CM5.1ii Significant Figures
- CM5.1iii Mass to Moles Conversion
- CM5.1iv Quantitative Arithmetic
- CM5.1v Yield and Economy Calculations
- CM5.1vi Rearranging Equations
- C5.1a Concentration Relationships
- C5.1b Titration Techniques
- C5.1c Titration Calculations
- C5.1d Gas Volumes and Moles
- C5.1e Molar Gas Volume
- C5.1f Solution Concentration
- C5.1g Theoretical Mass
- C5.1h Percentage Yield
- C5.1i Atom Economy Definition
- C5.1j Calculating Atom Economy
- C5.1k Selecting Reaction Pathways
C5.2 Controlling reactions
- CM5.2i Rate Calculation Arithmetic
- CM5.2ii Rate Graphs
- CM5.2iii Gradients as Rate
- CM5.2iv Proportionality in Rates
- C5.2a Determining Reaction Rates
- C5.2b Interpreting Rate Graphs
- C5.2c Factors Affecting Rate
- C5.2d Collision Theory
- C5.2e Surface Area Effects
- C5.2f Catalysts Characteristics
- C5.2g Identifying Catalysts
- C5.2h Catalysis and Activation Energy
- C5.2i Enzymes
Topic C6 Global challenges
Improving processes and products · Organic chemistry · Interpreting and interacting with earth systems50 notes
C6.1 Improving processes and products
- CM6.1i Rate Calculation Arithmetic
- CM6.1ii Rate Graphs
- CM6.1iii Gradients as Rate
- CM6.1iv Proportionality in Rates
- C6.1a Metal Extraction Principles
- C6.1b Electrolytic Extraction
- C6.1c Biological Extraction Methods
- C6.1d Industrial Trade-offs
- C6.1e Reaction Condition Graphs
- C6.1f Industrial Conditions Justification
- C6.1g Haber Process Importance
- C6.1h Fertiliser Production Comparison
- C6.1i Agricultural Elements
- C6.1j Industrial Fertiliser Processes
- C6.1k Life-Cycle Assessment Principles
- C6.1l Life-Cycle Data Interpretation
- C6.1m Recycling Processes
- C6.1n Recycling Factors
- C6.1o Alloy Composition and Uses
- C6.1p Corrosion Processes
- C6.1q Corrosion Mitigation
- C6.1r Comparing Material Properties
- C6.1s Material Selection
C6.2 Organic chemistry
- CM6.2i Structural Representations
- C6.2a Functional Groups and Series
- C6.2b Drawing Organic Structures
- C6.2c Predicting Organic Reactions
- C6.2d Addition Polymerisation
- C6.2e Condensation Polymerisation
- C6.2f Polymerisation Techniques
- C6.2g Deducing Polymer Structures
- C6.2h Natural Polymers
- C6.2i Functional Group Generality
- C6.2j Crude Oil Separation
- C6.2k Distillation Mechanisms
- C6.2l Alkane Series
- C6.2m Crude Oil Importance
- C6.2n Hydrocarbons Dependency
- C6.2o Cracking
- C6.2p Chemical Cells
- C6.2q Fuel Cell Evaluation
C6.3 Interpreting and interacting with earth systems
All papers
Topic C7 Practical skills
Practical Activity Groups15 notes
PAGs Practical Activity Groups
- PAG 1 Reactivity Trend Practical
- PAG 2 Electrolysis Practical 3 notes
- PAG 3 Separation Techniques Practical
- PAG 4 Distillation Practical
- PAG 5 Identification of Species Practical 3 notes
- PAG 6 Titration Practical 3 notes
- PAG 7 Production of Salts Practical 2 notes
- PAG 8 Measuring Rates of Reaction Practical
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