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Chemistry learning and practice
Explore atoms, elements, bonding, reactions and energy changes. Follow chemical relationships, use the periodic table and practise the reasoning behind a calculation.
12 topics · 70 skills · Free plan available
Start learning ChemistryAcids & Bases
Acids and bases, the pH scale, strong against weak, neutralisation, and the ones in your kitchen.
- Acids and Bases
- Everyday Acids and Bases
- Neutralization
- Strong vs Weak Acids
- pH Scale
Applied Chemistry
Chemistry put to work — in medicine, in industry, in the environment, and the greener ways of doing it.
- Applied Chemistry
- Chemistry in Industry
- Chemistry in Medicine
- Environmental Chemistry
- Green Chemistry
Atomic Structure
Inside the atom: subatomic particles, atomic number and mass, electron shells, isotopes, ions and the models we use.
- Atomic Models
- Atomic Number and Mass
- Atoms
- Electron Shells
- Ions
- Isotopes
- Subatomic Particles
- Valence Electrons
Chemical Bonding
What holds atoms together — ionic, covalent and metallic bonds, molecules and compounds, polarity and Lewis structures.
- Bond Polarity
- Chemical Bonds
- Covalent Bonds
- Ionic Bonds
- Lewis Structures
- Metallic Bonds
- Molecules and Compounds
Chemical Reactions
What happens when substances react: reactants and products, types of reaction, balancing equations, energy, rates and catalysts.
- Balancing Equations
- Catalysts
- Chemical Reactions
- Energy in Reactions
- Reactants and Products
- Reaction Rates
- Types of Reactions
Chemistry Basics
Where chemistry starts — what it studies, lab safety, matter and energy, physical against chemical change, and measurement.
- Branches of Chemistry
- Chemistry in Daily Life
- Lab Safety
- Matter and Energy
- Physical vs Chemical Changes
- Scientific Measurement
- What Is Chemistry
Organic Basics
The chemistry of carbon: carbon compounds, hydrocarbons, functional groups, and why living things are built from them.
- Carbon Compounds
- Functional Groups
- Hydrocarbons
- Organic Chemistry
- Organic Chemistry in Life
Periodic Table
Reading the periodic table — its layout, groups and periods, metals and nonmetals, and the trends that run across it.
- Groups and Periods
- Metals, Nonmetals, Metalloids
- Periodic Table Layout
- Periodic Trends
- Reactivity Trends
- Using the Periodic Table
Solutions Mixtures
Solutions and mixtures: solutes and solvents, concentration, and the ways a mixture can be separated.
- Concentration
- Mixtures
- Separating Mixtures
- Solutes and Solvents
- Solutions
States of Matter
Solids, liquids, gases and plasma — how particles move in each, and what happens at a change of state.
- Changes of State
- Particle Motion
- Plasma
- Solids, Liquids, Gases
- States of Matter
Stoichiometry
Counting in chemistry: the mole, molar mass, mole ratios, and working out which reactant runs out first.
- Limiting Reactants
- Molar Mass
- Mole Concept
- Mole Ratios
- Stoichiometry
Thermochemistry
Heat in reactions — endothermic and exothermic changes, how heat moves, and reading an energy diagram.
- Endothermic Reactions
- Energy Diagrams
- Exothermic Reactions
- Heat Transfer
- Thermochemistry
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