Exam prep · Free college course
A complete first-semester general chemistry course, built from OpenStax Chemistry 2e chapters 1 through 10 and the C-ID CHEM 110 transfer descriptor. It opens with measurement, significant figures and the atom, then moves through nomenclature, the mole, chemical reactions and stoichiometry - the course's math-heaviest stretch. Light and the quantum atom, electron configurations and periodic trends lead into chemical bonding and molecular shape (VSEPR, hybridization, molecular orbital theory), and the course closes with gases and the liquids/solids unit. There are no images: every card, including Lewis structures and VSEPR geometries, is written to be answerable in words, with a formula-and-definition note at the head of every chapter. About a fifth of the cards are worked calculations (molar mass, molarity and dilution, limiting reactant and percent yield, calorimetry and Hess's law, photon energy, the ideal gas law), each independently recomputed before publishing.
Copied straight from the course. In the app, each wrong option also gets its own explanation.
Card 1For 2Al + 3Cl2 -> 2AlCl3, how many moles of AlCl3 form from 6 moles of Cl2 (Al in excess)?
4 mol. Mole ratio Cl2:AlCl3 = 3:2, so 6 mol Cl2 x (2/3) = 4 mol AlCl3.
Card 2What is the ideal bond angle in an octahedral electron-domain geometry?
90 degrees. An octahedral arrangement (6 domains) places all adjacent bonding positions at 90 degrees to each other.
Card 3Which of these ions is a polyatomic cation, rather than an anion?
Ammonium. Ammonium (NH4+) is the one common polyatomic ion that carries a positive charge, making it a cation.
Yes. Create a free Encodr account and all 13 units and 1,197 cards are yours to study, with spaced repetition scheduling your reviews.
OpenStax Chemistry 2e chapters 1 through 10: measurement and matter, atoms and the periodic table, nomenclature, the mole, chemical reactions, stoichiometry, thermochemistry, light and the quantum atom, electron configurations and periodic trends, chemical bonding, molecular shape and bonding theories, gases, and liquids and solids.
No images anywhere in the course. Every card, including geometry and Lewis-structure questions, is written to be fully answerable in words, and each chapter opens with a note card carrying the formulas and reference tables (like the full VSEPR angle table) the rest of the chapter leans on.
About a fifth of the cards are worked calculations: significant figures and dimensional analysis, molar mass and molarity, stoichiometry (limiting reactant, percent yield, titration), calorimetry and Hess's law, photon energy and Bohr transitions, formal charge, and the gas laws. Every numeric card states its rounding rule and was independently recomputed before publishing.
General Chemistry II picks up with solutions, kinetics, equilibrium, acids and bases, thermodynamics, electrochemistry and nuclear chemistry.