Organic Chemistry Practice
Interactive practice tools with instant feedback on key topics to help you master organic chemistry.
Structure and Drawing
- Determine a Molecular Formula Count atoms from line-angle structures and check your answer instantly.
- IUPAC Nomenclature Name organic compounds systematically with personalized feedback to incorrect answers.
- Nomenclingo (IUPAC Name Builder) Build IUPAC names piece by piece from a structure in this interactive naming game.
- Functional Group Identification Spot every functional group in a molecule before checking your answer.
- Identify Aromaticity Determine whether ring systems are aromatic, antiaromatic, or nonaromatic.
Arrow Drawing
- Resonance Arrows Draw curved arrows showing electron movement between resonance forms.
- Mechanism Arrows Learn to draw curved arrows for common organic mechanism steps.
Stereochemistry
- Assign R or S Stereochemistry Assign R or S to chiral centers using an interactive 3D model.
- Assign E or Z Stereochemistry Determine E/Z configuration of alkenes using Cahn-Ingold-Prelog priority rules.
- Identify meso Compounds Identify meso compounds by finding internal planes of symmetry.
- Stereoisomer Relationships Classify pairs of molecules as enantiomers, diastereomers, or identical.
Conformations
- Newman Projections: Identify Identify anti, gauche, and eclipsed conformations on sight.
- Newman Projections: Build Translate wedge-dash structures by placing substituents interactively.
- Newman Projections: Rotate Rotate Newman projections to match with line-angle drawings.
- Chair Conformations Place substituents in the correct axial or equatorial positions on a chair.
- Chair Conformations: Free Draw Draw chairs from scratch with real-time angle feedback.
- Chair Conformations: Energy Compare chair conformers and pick the more stable one using A-values.
General Chemistry Practice
Build intuition for core general chemistry concepts with interactive practice problems and instant feedback.
Atoms & Measurement
- Subatomic Particles Find the number of protons, neutrons, and electrons for any element or ion.
- Significant Figures Count sig figs and round answers correctly in calculation problems.
- Dimensional Analysis Convert between units using dimensional analysis with step-by-step practice.
- Electron Configuration Write electron configurations for atoms and ions using the Aufbau principle.
Bonding & Structure
- Lewis Structures Draw Lewis dot structures for molecules and ions interactively.
- Molecular Geometry (VSEPR) Predict molecular shapes and bond angles using VSEPR theory.
Periodic Trends & Reactions
- Atomic & Ionic Size Compare atomic and ionic radii across the periodic table.
- Periodic Trends (IE, EN, EA) Compare ionization energy, electronegativity, and electron affinity across elements.
- Oxidation Numbers Assign oxidation states to atoms in compounds and ions.
- Balancing Equations Balance chemical equations one coefficient at a time.
- Le Chatelier's Principle Predict how equilibrium shifts in response to changes in conditions.
Naming & Formulas
- Naming Compounds Name ionic, covalent, and acid compounds from their formulas.
- Polyatomic Ions Memorize polyatomic ion names and formulas with flashcard-style practice.
Stoichiometry & Solutions
- Mole Conversions Convert between moles, grams, and particles step by step.
- Limiting Reagent Identify limiting reagents and calculate theoretical yields.
- Dilution (M₁V₁=M₂V₂) Solve dilution problems using the M1V1=M2V2 equation.
- Gas Laws Solve ideal gas law, combined gas law, and partial pressures problems.
Acids, Bases & Thermo
- Acid/Base Strength Compare acid and base strength using structure and periodic trends.
- Thermochemistry Solve enthalpy, Hess's law, and calorimetry problems.
- Nuclear Chemistry Solve nuclear decay, half-life, and nuclear equation balancing problems.
Literature Examples of Reactions
Tired of too-simple and made-up organic reactions that look nothing like actual exam problems? Check out this collection of real-world examples of reactions curated directly from scientific literature. Use them to practice predicting the product or to hone your mechanism drawing skills.
Substitution & Elimination Reactions
Carbonyl Chemistry
Enol & Enolate Chemistry
Aromatic Chemistry
More On The Way
Reactions
Interactive practice for product prediction under development.
Spectroscopy
Interactive practice for NMR, IR, and Mass Spec is currently under development.