Your Chemistry Journey, mapped stage by stage
Six stages of learning chemistry, each broken into rounds. Clear one to unlock the next — just like a video game — and collect a certificate at the end of every stage.
Welcome to Chemi-Cat
Create your free account, meet your lab partner, and get your bearings before Stage 1 begins.
Stage 1 · 12 rounds
General Chemistry
The essential concepts needed to understand every other branch of chemistry: matter, atoms, elements, the periodic table, bonding, reactions, solutions, acids and bases, equilibrium, and thermodynamics.
Basics of Chemistry
Build a strong foundation in core concepts, lab safety, scientific measurement, and running experiments.
The World of Matter
Matter's properties, transformations, and states — plus atoms, elements, compounds, and mixtures.
Inside the Atom
Atomic theory, waves, quantum theory, photons, and how electrons interact with energy.
Exploring the Periodic Table
How elements are organized, periodic trends, and electron behavior.
The World of Chemical Bonds
Chemical bonding, molecular shapes, and the forces that hold atoms and molecules together.
Understanding Chemical Compounds
Naming, measuring, and analyzing compounds — introducing the mole.
Chemical Reactions & Calculations
How substances change during reactions, and how to calculate those changes.
The World of Gases
Kinetic Molecular Theory and the gas laws that explain how gases behave.
Solutions & Solubility
How substances dissolve and mix — solubility, solubility rules, and concentrations.
Acids, Bases & pH
Measuring acid/base strength — pH, conjugate acids and bases, and titrations.
Chemical Equilibrium
How reactions balance forward and reverse — plus Le Châtelier's Principle.
Energy & Reaction Rates
The laws of thermodynamics and why some reactions happen faster than others.
Stage 2
Organic Chemistry
Learn about carbon-containing compounds and how they're structured, named, synthesized, and transformed.
Stage 3
Inorganic Chemistry
Explore elements and compounds outside organic chemistry: metals, minerals, salts, acids, bases, and coordination compounds.
Stage 4
Biochemistry
Apply your chemistry knowledge to understand the molecules and chemical reactions that make life possible.
Stage 5
Physical Chemistry
Connect chemistry with physics and mathematics to understand why and how chemical systems behave.
Stage 6
Nuclear Chemistry
Take chemistry to the atomic nucleus and discover how nuclear changes produce energy and new elements.
You've made it — Chemi-Cat Certified
Finish all six stages and earn full Chemi-Cat certification — proof of a journey well traveled.
Clear a stage, earn a certificate
Every stage ends with a certificate that recognizes what you've mastered — proof of progress you can keep, and a nudge to start the next stage.