HL IB Chemistry Revision Notes 2025

Syllabus Edition

First teaching 2023

First exams 2025

How Much, How Fast & How Far?

Balancing Equations

Reacting Mass Calculations

Avogadro's Law & Molar Volume of Gas

Concentration Calculations

Limiting & Excess Reactants

Percentage Yield Calculations

Atom Economy

Rate of Reaction

Measuring Rates of Reaction

Collision Theory

Factors Affecting Rates of Reaction

Activation Energy

Energy Profiles With & Without Catalysts

Maxwell-Boltzmann Distribution Curves

Rate Equation (HL)

Reaction Orders (HL)

The Rate Constant (HL)

Reaction Mechanisms (HL)

Molecularity (HL)

The Arrhenius Equation (HL)

Determining Activation Energy & the Arrhenius Factor (HL)

The Characteristics of Dynamic Equilibrium

The Equilibrium Law

The Equilibrium Constant

Le Chatelier's Principle

The Reaction Quotient (HL)

Equilibrium Law Problem Solving (HL)

The Equilibrium Constant & Gibbs Energy (HL)

What are the Mechanisms of Chemical Change?

Brønsted–Lowry Acids & Bases

Conjugate Acids & Bases

Amphiprotic Species

The pH Scale

The Ion Product of Water

Strong & Weak Acids

Neutralisation Reactions

pH Curves

Interpreting pH Curves (HL)

The pOH Scale (HL)

Acid & Base Dissociation Constants (HL)

Solving Acid-Base Dissociation Problems (HL)

Salt Hydrolysis (HL)

Acid-Base Indicators (HL)

Choosing an Acid-Base Indicator (HL)

Buffer Solutions (HL)

Buffer Calculations (HL)

Oxidation & Reduction

Half Equations

Relative Ease of Oxidation & Reduction

Acids with Reactive Metals

Primary Cells

Secondary Cells

Electrolytic Cells

Oxidation of Alcohols

Reduction of Carboxylic Acids, Aldehydes & Ketones

Reduction of Unsaturated Compounds

The Hydrogen Electrode (HL)

Standard Cell Potentials (HL)

Gibbs Energy & Standard Cell Potential (HL)

Electrolysis of Aqueous Solutions (HL)

Electroplating (HL)

Radicals

Homolytic Fission

Halogenation of Alkanes

Nucleophilic Substitution

Heterolytic Fission

Electrophilic Addition Reactions

Lewis Acids & Bases (HL)

Lewis Acid & Base Reactions (HL)

Coordination Bonds (HL)

Nucleophilic Substitution in Halogenoalkanes (HL)

Relative Rates of Nucleophilic Substitution (HL)

The Mechanisms of Electrophilic Addition Reactions (HL)

Addition to Unsymmetrical Alkenes (HL)

Electrophilic Substitution in Benzene (HL)

Tools

Safety, Ethical & Environmental Issues in Chemistry

Measuring Variables in Chemistry

Applying Techniques in Chemistry

Applying Technology to Collect Data in Chemistry

Applying Technology to Process Data in Chemistry

Applying General Mathematics in Chemistry

Using Units, Symbols & Numerical Values in Chemistry

Processing Uncertainties in Chemistry

Graphing in Chemistry

HL IB Chemistry Revision Notes

Models of the Particulate Nature of Matter

Models of Bonding & Structure

Classification of Matter

What Drives Chemical Reactions?

How Much, How Fast & How Far?

What are the Mechanisms of Chemical Change?

Tools