OCR GCSE Combined Science B · J260

OCR GCSE Combined Science B Chemistry

Length: 1 hour 45 minutes
Marks: 95
Weighting: 26.4% of the GCSE

From the OCR specification (opens in a new tab), Version 5.0 (June 2026), PDF page 11.

9 sections · 78 revision notes · 18 past papers

What’s on Chemistry

Chapter C1 Air and Water

Evolution of the Earth's Atmosphere · Temperature Changes in Chemical Reactions · Evidence and Causes of Climate Change · Supplying Potable WaterAlso on Combined Science8 notes

C1.1 Evolution of the Earth's Atmosphere

Particle Model and Atmospheric Evolution 2 notes
- Particle Model and Changes of State

Chemistry past papers

Atmospheric Evolution and Pollutant Sources

Pollution Mitigation and Chemical Formulae 2 notes

Chapter C2 Chemical Patterns

Development of the Atomic Model · The Periodic Table · Bonding in Metals and Non-Metals · Representing Chemical ReactionsAlso on Combined Science6 notes

C2.1 Development of the Atomic Model

Atomic Structure and Subatomic Particles

C2.2 The Periodic Table

Element Properties and Periodicity 2 notes
- Development and Organisation of the Periodic Table
- Group 1 and Group 7: Properties, Reactions and Reactivity Patterns

C2.3 Bonding in Metals and Non-Metals

C2.4 Representing Chemical Reactions

Chemical Formulae and Equations

Chemical Patterns overview

Chapter C3 Chemicals of the Natural Environment

Metallic Bonding and Structure · Extracting Metals Based on Reactivity · Electrolytes and Electrolysis · Crude Oil as a Material SourceAlso on Combined Science9 notes

C3.1 Metallic Bonding and Structure

Properties of Metallic Bonds

C3.2 Extracting Metals Based on Reactivity

Reactivity Series and Extraction Methods 2 notes
- Establishing and Explaining the Reactivity Series
- Choosing and Evaluating Metal Extraction Methods

C3.3 Electrolytes and Electrolysis

Processes and Products of Electrolysis 2 notes
- Electrode Reactions, Molten Electrolysis and Aluminium Extraction
- Aqueous Electrolysis: Products and Practical Technique

C3.4 Crude Oil as a Material Source

Fractional Distillation and Alkanes 2 notes
- Crude Oil, Alkanes and Fractional Distillation
- Determining Empirical Formulae
Covalent Bonding and Cracking 2 notes

Chemicals of the Natural Environment overview

Chapter C4 Material Choices

Data-Driven Material Selection · Bonding, Structure, and Material Properties · Nanoparticles and Their Uses · Product End-of-Life and Life Cycle AssessmentsAlso on Combined Science8 notes

C4.1 Data-Driven Material Selection

Physical Properties and Material Selection

C4.2 Bonding, Structure, and Material Properties

Chemical Bonds and Bulk Properties 3 notes

C4.3 Nanoparticles and Their Uses

Properties and Risks of Nanoparticles 2 notes
- Nanoscale Dimensions and Surface Area
- Nanomaterials: Structures, Uses and Risks

C4.4 Product End-of-Life and Life Cycle Assessments

Oxidation, Reduction, and LCAs 2 notes
- Oxidation and Reduction
- Life Cycle Assessments and Recycling Decisions

Material Choices overview

Chapter C5 Chemical Analysis

Chemical Separation and Purity Testing · Calculating Amounts of Substances · Measuring Chemicals in SolutionAlso on Combined Science6 notes

C5.1 Chemical Separation and Purity Testing

Purification and Chromatography Techniques 2 notes
- Formulations and Testing Purity
- Separation and Purification Methods

C5.2 Calculating Amounts of Substances

Conservation of Mass and Molar Calculations 2 notes
- Conservation of Mass, Relative Formula Mass and Moles
- Stoichiometry, Limiting Reactants and Reacting Masses

C5.3 Measuring Chemicals in Solution

Concentration Calculations and Titrations 2 notes
- Solution Concentration Calculations
- Neutralisation and Titration

Chemical Analysis overview

Chapter C6 Making Useful Chemicals

Products from Acid Reactions · Controlling Reaction Rates · Factors Affecting Chemical YieldAlso on Combined Science6 notes

C6.1 Products from Acid Reactions

Acid Reactions and pH 2 notes
- Acid Reactions and Salt Preparation
- pH, Acid Concentration and Strength

C6.2 Controlling Reaction Rates

Factors Affecting Reaction Rates
Measuring Rates and Enzymatic Catalysis 2 notes
- Measuring and Analysing Reaction Rates
- Enzymes in Biological Systems and Industry

C6.3 Factors Affecting Chemical Yield

Reversible Reactions and Dynamic Equilibrium

Making Useful Chemicals overview

Chapter BCP7 Ideas about Science

Scientific Investigation Considerations · Drawing Conclusions from Data · Development of Scientific Explanations · Societal Impact of Science and TechnologyOn every paper8 notes

IaS1 Scientific Investigation Considerations

Investigation Planning and Execution

IaS2 Drawing Conclusions from Data

Data Presentation and Evaluation 3 notes

IaS3 Development of Scientific Explanations

Scientific Models and Theories 3 notes

IaS4 Societal Impact of Science and Technology

Assessing Scientific Impact and Risk

Ideas about Science overview

Chapter BCP8 Practical Skills

Biology Practical Activities · Chemistry Practical Activities · Physics Practical ActivitiesOn every paper18 notes

Biology Practical Activities

B1 Microscopy Techniques 2 notes
- Microscopy and Scientific Drawings
- Accurate Biological Measurements
B2 Sampling Strategies
B3 Enzyme-Controlled Reactions
B4 Investigating Photosynthesis
B5 Microbiological Methods

Chemistry Practical Activities

Physics Practical Activities

Practical Skills overview

Chapter 5 Mathematical Skills and Equations

Mathematical Skills · Equations in PhysicsOn every paper9 notes

5e Mathematical Skills

5h Equations in Physics

Mathematical Skills and Equations overview

All OCR GCSE Combined Science B past papers

Covalent Bonding, Molecular Models and Properties

Cracking: Producing More Useful Materials

C4

Salt Production

C5 Measuring Reaction Rates

2 notes

P5 Energy Transfers

P6 Electrical Circuits