Chemistry Notes3.0

Chemistry Notes is a study companion for high school and first-year university chemistry. Each topic is explained in clear, simple language, with typeset formulas and chemical equations, original diagrams, worked examples with real numbers and practice questions with tap-to-reveal answers.

What the app covers

• Matter and Measurement: classifying matter, SI units and prefixes, significant figures and unit conversions
• Atoms and Electrons: subatomic particles, isotopes and atomic mass, light and atomic spectra, quantum numbers, orbital shapes and electron configurations
• The Periodic Table: groups, periods and blocks, periodic trends (radius, ionization energy, electron affinity, electronegativity) and element families
• Chemical Bonding: ionic, covalent and metallic bonds, Lewis structures, formal charge and resonance, VSEPR molecular shapes, hybrid orbitals, polarity and intermolecular forces
• Naming Compounds: ionic compounds, molecular compounds and acids
• The Mole and Stoichiometry: molar mass, empirical and molecular formulas, balancing equations, reaction types, limiting reactant and percent yield
• States of Matter: gas laws, the ideal gas law, partial pressures, kinetic theory and real gases, vapour pressure, crystal structures and phase diagrams
• Solutions: solubility, concentration units, dilution, titration calculations and colligative properties
• Thermochemistry and Thermodynamics: heat and calorimetry, enthalpy, Hess's law, bond enthalpies, entropy and Gibbs energy
• Chemical Kinetics: reaction rates, rate laws, half-life, the Arrhenius equation, catalysts and mechanisms
• Chemical Equilibrium: equilibrium constants, ICE tables, Le Chatelier's principle and solubility products
• Acids and Bases: definitions, pH, weak acids and bases, buffers and titration curves
• Redox and Electrochemistry: oxidation numbers, balancing redox equations, galvanic cells, standard potentials, the Nernst equation and electrolysis
• Nuclear Chemistry: nuclear stability and binding energy, radioactive decay, half-life and dating, fission, fusion and radiation
• Organic Chemistry Basics: hydrocarbons and their names, functional groups, isomers and common reactions
• Reference Tables: physical constants (CODATA 2022), atomic weights, common ions, solubility rules, acid and base constants, thermodynamic data and standard reduction potentials

Made for studying
• Original diagrams: orbital shapes, the periodic table, VSEPR shapes, phase diagrams, energy profiles, titration curves, a galvanic cell and more
• Every formula with a list of its symbols and units
• Worked examples and practice questions in every topic
• Notes on common mistakes and sign conventions
• Search across all topics
• Previous and Next buttons to work through a section in order
• Dark mode
• Works offline, with no account needed
• Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia

Useful for school chemistry, AP, A-level and IB courses, and introductory college and university chemistry. Content is checked against the OpenStax chemistry textbooks, IUPAC recommendations and NIST reference data.

This app is an independent study aid. It is not affiliated with any exam board, textbook publisher or standards body.