Causes of Disease · Organism Defences Against Pathogens · Prevention of Infection Spread · Lifestyle, Genes, and Health · Disease Treatment and MedicineAlso on Biology8 notes

Chapter B3 Food and Ecosystems

Photosynthesis · Plant Transport and Absorption · Ecosystem Interdependence · Population Dynamics and Ecosystem ConditionsAlso on Biology10 notes

B3.1 Photosynthesis

Photosynthetic Processes and Rates 3 notes

B3.2 Plant Transport and Absorption

Cellular Transport and Plant Vessels 3 notes

B3.3 Ecosystem Interdependence

Biomass Transfer and Nutrient Cycling 3 notes

B3.4 Population Dynamics and Ecosystem Conditions

Investigating Ecosystems

Food and Ecosystems overview

Chapter B4 Food and Growth Control

Cellular Respiration Process · Microscopy and Cell Structures · Organism Growth and Development · Stem Cells in MedicineAlso on Biology6 notes

B4.1 Cellular Respiration Process

Cellular Respiration Fundamentals

B4.2 Microscopy and Cell Structures

Electron Microscopy Applications

B4.3 Organism Growth and Development

Cell Division and Differentiation 3 notes

B4.4 Stem Cells in Medicine

Ethics of Stem Cell Use

Food and Growth Control overview

Chapter B5 Human Body Systems and Survival

Substance Transport in the Body · Nervous System and Responses · Hormonal Coordination and Control · Homeostasis and Internal Environments · Hormones in Human Reproduction · Blood Sugar Regulation and DiabetesAlso on Biology9 notes

B5.1 Substance Transport in the Body

Transport Systems and Exchange Surfaces 2 notes
- Cellular Exchange and the Need for Transport Systems
- The Human Circulatory System: Heart, Vessels and Blood

B5.2 Nervous System and Responses

Nervous System Components and Reflexes

B5.3 Hormonal Coordination and Control

Endocrine System Principles

B5.4 Homeostasis and Internal Environments

Importance of Homeostasis

B5.5 Hormones in Human Reproduction

Reproductive Hormones and Technologies 3 notes

B5.6 Blood Sugar Regulation and Diabetes

Insulin, Glucagon, and Diabetes

Human Body Systems and Survival overview

Chapter B6 Evolution and Biodiversity

Development of Evolutionary Theory · Classification of Organisms · Biodiversity and ConservationAlso on Biology4 notes

B6.1 Development of Evolutionary Theory

Natural Selection and Evolution Evidence 2 notes
- Genetic Variation, Natural Selection and Selective Breeding
- Evidence for Evolution

B6.2 Classification of Organisms

DNA and Classification Systems

B6.3 Biodiversity and Conservation

Human Impacts on Biodiversity

Evolution and Biodiversity overview

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 Chemistry8 notes

C1.1 Evolution of the Earth's Atmosphere

Particle Model and Atmospheric Evolution 2 notes
- Particle Model and Changes of State
- Atmospheric Evolution and Pollutant Sources
Pollution Mitigation and Chemical Formulae 2 notes
- Atmospheric Pollution and Emission Control
- Chemical Formulae, Equations, Gas Tests and Oxidation

C1.2 Temperature Changes in Chemical Reactions

Energy Changes and Reaction Profiles

C1.3 Evidence and Causes of Climate Change

Climate Change Impacts and Mitigation 2 notes
- Greenhouse Effect and Evidence for Climate Change
- Climate Change Impacts and Mitigation

C1.4 Supplying Potable Water

Water Treatment and Chlorine Testing

Air and Water overview

Chapter C2 Chemical Patterns

Development of the Atomic Model · The Periodic Table · Bonding in Metals and Non-Metals · Representing Chemical ReactionsAlso on Chemistry6 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 Chemistry9 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 Chemistry8 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 Chemistry6 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 Chemistry6 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 P1 Radiation and Waves

Risks and Benefits of Radiation · Evidence and Mechanics of Climate Change · Wave Behavior and PropertiesAlso on Physics5 notes

P1.1 Risks and Benefits of Radiation

Electromagnetic Spectrum Properties 2 notes
- Electromagnetic Spectrum Properties and Radio Waves
- Radiation and Matter: Production, Uses and Hazards

P1.2 Evidence and Mechanics of Climate Change

Radiation Emission and Earth's Temperature

P1.3 Wave Behavior and Properties

Wave Motion and Interactions 2 notes
- Wave Properties, Types and Speed
- Reflection and Refraction of Waves

Radiation and Waves overview

Chapter P2 Sustainable Energy

Energy Usage and Transfer · Electricity Generation ResourcesAlso on Physics4 notes

P2.1 Energy Usage and Transfer

Electrical Energy Efficiency 2 notes
- Domestic Electrical Energy Use
- Energy Conservation, Dissipation and Efficiency

P2.2 Electricity Generation Resources

Energy Resources and the National Grid 2 notes
- Energy Resources, Electricity Generation and Usage Trends
- The National Grid, Domestic Mains and Electrical Safety

Sustainable Energy overview

Chapter P3 Electric Circuits

Current, Charge, and Resistance · Series and Parallel Circuits · Rate of Energy Transfer · Magnetic Fields · Electric Motors and the Motor EffectAlso on Physics9 notes

P3.1 Current, Charge, and Resistance

Circuit Quantities and Characteristics 2 notes
- Circuit Quantities and Measuring Resistance
- Component Resistance and Current–Voltage Characteristics

P3.2 Series and Parallel Circuits

Circuit Properties and Problem Solving 2 notes
- Potential Difference, Series and Parallel Circuits
- Using D.C. Circuits to Investigate Components

P3.3 Rate of Energy Transfer

Power, Energy, and Transformers 2 notes
- Energy and Power in Circuit Devices
- Transformers and Efficient Power Transmission

P3.4 Magnetic Fields

Magnets and Electromagnetism 2 notes
- Magnets and Magnetic Fields
- Magnetic Fields from Currents and Solenoids

P3.5 Electric Motors and the Motor Effect

Calculating and Applying the Motor Effect

Electric Circuits overview

Chapter P4 Forces and Motion

Nature of Forces · Describing Motion · Forces, Momentum, and Acceleration · Work, Energy, and PowerAlso on Physics10 notes

P4.1 Nature of Forces

Interaction Forces and Weight

P4.2 Describing Motion

Speed, Velocity, and Acceleration
Motion Graphs and Equations 2 notes
- Drawing and Interpreting Motion Graphs
- Motion Equations and Everyday Accelerations

P4.3 Forces, Momentum, and Acceleration

Resultant Forces and Momentum 2 notes
- Resultant Forces and Vector Diagrams
- Momentum, Collisions and Force
Newton's Laws and Reaction Times 2 notes
- Newton's Laws and Changes in Motion

P4.4 Work, Energy, and Power

Forces and Motion overview

Chapter P5 Radioactive Materials

Atomic Structure and Radioactivity · Radiation Hazards and SafetyAlso on Physics4 notes

P5.1 Atomic Structure and Radioactivity

Atomic Models and Isotopes
Radioactive Decay and Half-Life 2 notes
- Nuclear Emissions and Decay Equations
- Random Decay and Half-Life

P5.2 Radiation Hazards and Safety

Penetration, Contamination, and Medical Uses

Radioactive Materials overview

Chapter P6 Models of Matter

Energy, Temperature, and Density · Particle Model and Heating · Materials Under StressAlso on Physics4 notes

P6.1 Energy, Temperature, and Density

Density, Heat Capacity, and Latent Heat 2 notes
- Density: Measurement and Calculations
- Heating, Heat Capacity and Latent Heat

P6.2 Particle Model and Heating

States of Matter and Gas Pressure

P6.3 Materials Under Stress

Elasticity and Spring Extension

Models of Matter 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

Reaction Times, Stopping Distances and Road Safety

C4

Salt Production

C5 Measuring Reaction Rates

2 notes

P5 Energy Transfers

P6 Electrical Circuits

What’s on Combined Science

Chapter B1 Genetics and Inheritance

B1.1 The Genome and Its Functions

Combined Science past papers

2025 papers

2024 papers

2023 papers

B1.2 Inheritance of Genetic Information

B1.3 Applications and Ethics of Gene Technology

Chapter B2 Health and Disease

B2.1 Causes of Disease

B2.2 Organism Defences Against Pathogens

B2.3 Prevention of Infection Spread

B2.4 Lifestyle, Genes, and Health

B2.5 Disease Treatment and Medicine