Master Chemistry from first principles
Texas CBE prep · TEKS §112.43 (NOT AP® Chemistry). Atomic structure, bonding, reactions, stoichiometry, gas laws, solutions, thermochemistry, and nuclear chemistry. This service prepares Texas HS-level Chemistry for CBE credit through UT High School / Texas Tech K-12; it is not designed for the College Board AP® Chemistry exam. AP® is a registered trademark of the College Board, which was not involved with this product.
Chemistry — Essential Concepts
Periodic trends, bonding, stoichiometry, gas laws, and acid/base chemistry — every Chemistry CBE essential on one page.
Lab Safety & the Scientific Method
Before you mix anything: master the safety rules and the experimental mindset that every CBE question tests. Hypotheses vs theories, controls, sig figs, and the everyday gear that keeps the lab safe.
Matter: States, Properties, and Why It All Changes
On the current Chemistry CBE, what's assessed is writing and balancing chemical equations by conservation of mass and recognizing the five reaction types — synthesis, decomposition, single and double replacement, and combustion (TEKS 9A, 9B). The opening material — states of matter, physical-versus-chemical properties, and mixtures versus pure substances — is foundational background, not among the student expectations under the 2020 Chemistry TEKS.
Reading the Periodic Table: Trends That Predict Everything
The periodic table isn't a list — it's a predictive engine. Groups, periods, blocks, and the four major trends (atomic radius, ionization energy, electronegativity, metallic character) that the CBE leans on heavily.
Atoms: Subatomic Particles & Electron Configuration
Protons, neutrons, electrons — and the rules that govern where electrons live. Isotopes, the Bohr model, modern orbitals, and how to write the configuration of any element you'll see on the CBE.
Chemical Bonding: Ionic, Covalent, and Molecular Shapes
Why do atoms bond at all? Ionic, covalent, and metallic bonding compared — plus Lewis structures, polarity, VSEPR shapes, and the intermolecular forces that make water wet.
The Mole & Stoichiometry: Chemistry's Counting Unit
Avogadro's number is just chemistry's 'dozen' — and stoichiometry is its grocery-list math. Mole conversions, mass-to-mass calculations, limiting reagent, and percent yield with worked examples.
Solutions: Molarity, Dilution, and Colligative Properties
When salt disappears into water, what really happens? Solubility, the math of molarity and dilution, the like-dissolves-like rule, and how dissolved solute changes the boiling and freezing points.
Gas Laws & the Kinetic Molecular Theory
Boyle, Charles, Gay-Lussac, and the ideal gas law — plus the kinetic molecular theory that explains WHY gases behave the way they do.
Thermochemistry: Heat in Reactions
Why some reactions burn hot while others get cold. Endothermic vs exothermic, ΔH sign conventions, specific heat calculations, calorimetry, and phase-change energies.
Nuclear Chemistry: Decay, Fission, and Fusion
Alpha, beta, gamma — the three classic decay types. Half-life problems, balancing nuclear equations, and the difference between fission (splitting heavy nuclei) and fusion (combining light nuclei). Plus how radioisotopes serve medicine and dating.