Fundamentals
5 articlesAcids, Bases, and pH: From Lemon Juice to Drain Cleaner
Understand the three definitions of acids and bases, how pH works, strong vs. weak acids, and how buffers keep your blood from killing you.
· 8 min read
Atoms, Elements, and Compounds: The Building Blocks of Matter
Start from the ground floor of chemistry — what atoms are made of, how elements differ from compounds, and why the difference between a mixture and a compound matters.
· 8 min read
History of Chemistry and the Periodic Table: From Alchemy to Atomic Theory
Trace the development of chemistry from ancient fire-making to Mendeleev's periodic table, Dalton's atomic theory, and the modern quantum model.
· 9 min read
Measurement and Significant Figures: Getting Chemistry Numbers Right
Learn SI units, how to handle significant figures in calculations, the difference between accuracy and precision, and why unit conversions are half of chemistry.
· 8 min read
States of Matter and Phase Changes: From Ice to Steam and Beyond
A guide to solids, liquids, gases, and plasma — how particles behave in each state and what drives phase changes like melting, boiling, and sublimation.
· 7 min read
Elements & Periodic Table
5 articlesElectron Configuration Explained: Orbitals, Shells, and the Aufbau Principle
Learn how electrons fill atomic orbitals, how to write electron configurations, and why exceptions like copper and chromium break the rules.
· 8 min read
How to Memorize the Periodic Table (Without Losing Your Mind)
Practical strategies for learning all 118 elements — from mnemonic devices to pattern recognition and spaced repetition.
· 8 min read
Main Group Families: Alkali Metals, Halogens, Noble Gases, and the Rest
A tour of the main group (s-block and p-block) element families — what properties they share, why they share them, and what distinguishes each group.
· 8 min read
Metals, Nonmetals, and Metalloids: The Three Regions of the Periodic Table
Understand how the periodic table splits into metals, nonmetals, and metalloids — their physical and chemical properties, where they sit on the table, and why the boundaries matter.
· 7 min read
Periodic Trends Explained: Atomic Radius, Electronegativity, and More
A clear guide to the major periodic trends — how and why atomic radius, ionization energy, electronegativity, and electron affinity change across the table.
· 7 min read
Bonding & Structure
3 articlesChemical Bonding: Ionic, Covalent, and Metallic Bonds Explained
A comprehensive guide to the three main types of chemical bonds — how they form, what properties they produce, and how to predict which type a compound will have.
· 9 min read
Lewis Structures Step by Step: Drawing Molecules That Make Sense
A practical, worked-example guide to Lewis dot structures — counting valence electrons, placing atoms, satisfying the octet rule, and handling resonance and formal charge.
· 9 min read
VSEPR and Molecular Geometry: Predicting the Shape of a Molecule
Use VSEPR theory to predict 3D molecular shapes from Lewis structures — linear, trigonal planar, tetrahedral, and the bent/pyramidal variants caused by lone pairs.
· 8 min read
Stoichiometry & Reactions
3 articlesBalancing Chemical Equations: A Systematic Method
Learn why chemical equations must balance, how to balance them step by step, and strategies for handling polyatomic ions, combustion, and redox equations.
· 8 min read
Stoichiometry Basics: Moles, Molar Mass, and Reaction Calculations
Master the mole concept, molar mass, and how to use balanced equations to calculate reactant and product quantities in chemical reactions.
· 9 min read
Types of Chemical Reactions: Synthesis, Decomposition, Displacement, and More
A guide to the major classes of chemical reactions — how to recognize each type, predict products, and connect the pattern to the underlying chemistry.
· 8 min read
Reference & Memorization
5 articlesActivity Series of Metals: Predicting Single Displacement Reactions
The metal activity series ranks metals by how easily they lose electrons — use it to predict whether a single displacement reaction will happen, including reactions with acids and water.
· 6 min read
Common Chemical Compounds to Know: Formulas, Names, and What They're For
A reference list of the chemical compounds every chemistry student should recognize — hydrocarbons, acids, bases, oxides, salts, and biomolecules — with formulas and what they do.
· 8 min read
Common Polyatomic Ions: Names, Formulas, and Charges
The polyatomic ion table every chemistry student has to memorize — sulfate, nitrate, carbonate, ammonium, and the rest — with formulas, charges, and patterns.
· 6 min read
Solubility Rules: Predicting Which Ionic Compounds Dissolve in Water
The standard intro-chemistry solubility rules, with the exceptions that actually matter — used for predicting precipitates in double displacement reactions.
· 6 min read
Strong Acids and Bases: The Short List You Have to Memorize
The complete list of strong acids and strong bases used in intro chemistry — with formulas, why they're classified as strong, and how to tell the difference from weak acids.
· 5 min read