Study Tools

Session Notes: Physics, Chemistry, Math

Every class's notes by subject and date, as a web page with a PDF download: 10 Physics, 9 Chemistry and 5 Math.

Chemistry Interim Quiz

Units 1, 2 and 3 from a bank of 263 questions. Topic quizzes with instant answers, or a 30-question timed mock test weighted like the interim: 60% atomic structure, 20% periodic trends, 20% bonding.

Chemistry Interim Flashcards

225 cards: atomic models, particles, isotopes and ions, average atomic mass, fusion, electron configuration, light, spectra, periodic trends and bonding. Browse, or drill in Study mode.

Electron Configuration Lab

Hydrogen to krypton. See the rules, fill orbital diagrams box by box, write full and noble gas configurations, and decide ground state, excited state or not possible.

Isotopes, Ions and Average Atomic Mass

Count protons, neutrons and electrons from a symbol, tell isotopes from ions, and practice average atomic mass: find the average, the missing percents or the missing isotope mass, with step-by-step solutions.

Emission Spectra Lab

Excite a hydrogen electron and watch it emit light, then match line spectra to find which elements are in an unknown. Plus a 12-question check.

Chemical Bonding: Unit Quiz

Every topic on the unit test, from a bank of 124 questions: bond types, drawing, properties, naming, designing materials, geometry and polarity. Topic quizzes with instant answers, or a 35-question timed mock test.

Chemical Bonding: Unit Flashcards

126 cards across the 7 test topics, including the naming rules, polyatomic ions, property comparisons and the shape chart. Browse, or drill in Study mode.

Trends to Bonds

Four modules: compare periodic trends, build an ionic bond step by step, slide along the bond-character spectrum, and a quiz on naming covalent compounds.

Lewis Structure Builder

Build 20 molecules and polyatomic ions yourself in 4 steps: count electrons, pick the central atom, place lone pairs, complete octets. Instant hints when something is off.

Lewis Structures & Polyatomic Ions

75 cards: valence electrons, bond order, the 4-step method, electron counts, polyatomic ions, formal charge and resonance. Browse, or use Study mode to drill.

Lewis Structures Practice Test

32 questions, including pick-the-correct-structure diagrams. Submit for your score by topic and an explanation for every answer.

VSEPR Shape Explorer

Turn 3-D models of 35 molecules and ions, or build any shape from bonded atoms and lone pairs. See the electron and molecular geometry, the bond angle, and whether the bond dipoles cancel.

Wedge & Dash Lab

Turn a 3-D model and watch its wedge-and-dash drawing change, with a view from above showing what is in front of the page and what is behind. Then a quick quiz, and practice setting each bond yourself.

VSEPR Worksheet Trainer

The class worksheet one row at a time: valence electrons, Lewis structure, electron and molecular geometry, bond angle, 3-D redraw, bond and molecular polarity. Every column is marked with an explanation.

VSEPR Worksheet Test

The class worksheet with 5 new molecules every time, in Practice or Test mode. Fill in all 7 columns, build the 3-D redraw by tapping the bonds, and get a score for each column.

VSEPR, Shapes & Polarity

59 cards: electron domains, electron and molecular geometry, bond angles, wedge-and-dash drawings, bond and molecular polarity, and the 9/30 worksheet rows. Browse, or drill in Study mode.

VSEPR & Polarity Practice Test

32 questions, including pick-the-correct 3-D drawing and two full worksheet rows. Submit for your score by topic and an explanation for every answer.

Bonding & Formulas

149 cards on electronegativity, metallic, ionic and covalent bonds, alloys, ions and naming with prefixes. Browse them all, or use Study mode for shuffled self-testing.

Free-Body Diagram Builder

14 situations, from a book on a table to a block sliding down a rough slope. Add each force and its direction, get hints for missing or wrong forces, then name the net force.

F = ma Force Lab

Push a cart with any force, mass and surface. Watch friction, the net force, the acceleration and live v–t and a–t graphs, and complete five challenges.

Action–Reaction Pair Finder

15 Third-Law questions: find each force's partner, spot the pairs that only look like pairs, and see why they never cancel.

Newton's Laws of Motion

77 cards: forces, the three laws, mass vs weight, elevators, free-body diagrams, friction, inclines and pulleys. Browse, or drill in Study mode.

Newton's Laws Practice Test

32 questions, including pick-the-correct free-body diagram. Submit for your score by topic and an explanation for every answer.

Projectile Motion

Every projectile formula with its full derivation, plus six problems (two per case) solved step by step with a diagram that builds up as you go.

Unit 1 Practice Test

32 questions on vectors, technical drawings, 1-D motion, motion graphs and projectiles. Submit to get your score by topic and an explanation for every answer.