Subject Websites Videos
Atomic Mass UnitsDefinitionColorado Education ExplanationExplanatory Video
Avogadro's NumberBritannica DefinitionChem1 Explanation with Example ProblemsKhan Academy Introduction
Balancing Chemical EquationsPhET Introduction and SimulationJefferson Lab Practice10-Step Process ExplanationKhan Academy IntroductionExplained Practice ProblemsIntroduction to Balancing Chemical Equations
Chemical Equations: An Overview Vision Learning ExplanationInteractive ReviewHow to Write Chemical EquationsAnother Explanation Involving Writing Equations
Classification of MatterPren Hall Discussion with DiagramsChemogenesis Explanation and Graphic Organizer The Science Classroom Explanation
Compounds/Elements/Molecules Straight-Forward DiscussionSimple DefinitionsRelationships Between Elements, Molecules, and CompoundsRelationships Between Elements, Atoms, and MoleculesKhan Academy Elements and AtomsBill Nye Explanation
DensityVision Learning ExplanationPhET SimulationDensity Practice ProblemsBozeman Science Explanation
Empirical and Molecular FormulasSample CalculationsStep by Step Explanation and Sample ProblemsKhan Academy ExplanationCalculating Molecular Formula from Empirical Formula
Fundamental Chemical Laws PDF Explanation with ExamplesCrash Course Overview
Gravimetric AnalysisOverview with Example ProblemsBritannica DefinitionWired Chemist Lab ApplicationExplanatory Example Problem
History of the AtomConcise TimelineDetailed Explanation with Diagrams Brief Crash Course OverviewThe Science Classroom ExplanationModels of the Atom TImeline
IonsNorthwestern Definition What's an Ion?Alternate Explanation of Ions
Limiting ReactantsExplanation with Example ProblemsChem Team Explained Example Problems  Introduction to Limiting Reactant and Excess ReactantExplained Practice Problem
Metric Units and Prefixes Table OutlineBinary Prefixes 
MolesBritannica DefinitionVision Learning OverviewIntroduction to MolesKhan Academy: The Mole and Avogadro's NumberBozeman Science Mole Conversions,Mole Ratio Practice Problem ExplanationsConverting Between Moles, Atoms, and Molecules
Molar MassOverview and Explained ProblemsDefinition, Formula, and ExamplesHow to Calculate Molar MassChemistry Lesson Explanation
Naming Covalent CompoundsExplained Rules and Practice ProblemsNaming Binary Covalent CompoundsExplanatory TutorialBrightstorm Examples
Naming Ionic CompoundsKhan Academy: Naming Monatomic Ions and Ionic CompoundsClear Rules and Explained Examples Naming Ionic Compounds with Transition MetalsIntroduction to Writing Ionic FormulasExplanation of Naming Ionic Compounds Through Examples
Complete Molecular, Complete Ionic, and Net Ionic Equations, and Spectator IonsKhan Academy Explanation and Practice ProblemsChem Team OutlinePractice Problems with SolutionsBozeman Science Explanation
Percent Composition of CompoundsDefinition and Explained Example ProblemsCalculating Percent Composition and Determining Empirical Formulas Percent Composition by Mass TutorialExplanation with Practice Problems
Polyatomic IonsKhan Academy: Definition, Structure, Naming, and Example CalculationsPolyatomic Ions: Names, Formulas, and Shapes What is a Polyatomic Ion?Writing Formulas with Polyatomic Ions
Radioactivity/Radioactive DecayAtomic Notation, Alpha, Beta, and Gamma Decay, Writing Nuclear Equations, and Half-LifeKhan Academy: Writing Nuclear Equations for Alpha, Beta, and Gamma Decay, and Half-LifeCrash Course OverviewKhan Academy: Types of DecayNuclear Half-Life: Introduction and ExplanationWriting Nuclear Equations for Alpha, Beta, and Gamma Decay
Scientific NotationExplanation and Practice ProblemsExplained Practice Calculations A Chemical Introduction to Scientific NotationScientific Notation and Significant FiguresScientific Notation Practice Problems
Significant FiguresStep by Step TutorialAdding/Subtracting and Multiplying/Dividing with Significant FiguresLaboratory Application of Significant FiguresSignificant Figure RulesCrash Course: Unit Conversion and Significant FiguresHow to Determine Significant Figures and Use "Sig-Fig" RulesSignificant Figure Practice Problems
Stoichiometry Khan Academy Stoichiometry OverviewReaction Stoichiometry TutorialChem Wiki Stoichiometric Coefficients and Practice ProblemsKhan Academy IntroductionCrash Course ExplanationBozeman Science Example ProblemsStoichiometry: Grams to Moles
Systematic Error vs. Random Error and Uncertainty in MeasurementDefinitionsSpecific Examples and Minimizations,Practice Problems with SolutionsChem Wiki: Precision vs. Accuracy, Random Error vs. Systematic Error, Calculating Error, and Minimizing Error 
Theoretical/Actual/Percent YieldDefinitions and Steps for CalculationExplained Example Problems Tutorial with Explained StepsTheoretical, Actual, and Percent Yield Descriptions and Example Problem
Types of ReactionsSynthesis ReactionsDecomposition ReactionsAcid-Base ReactionsOxidation and Reduction ReactionsPrecipitation ReactionsCombustion ReactionsSingle Displacement ReactionsDouble Displacement Reactions Overview of Synthesis, Combustion, Decomposition, Single Replacement and Double Replacement ReactionsClassifying Types of Chemical Reactions Practice Problems
Unit ConversionUnit Conversion Using the Railroad Tracks MethodBasic Unit Conversion and Conversion Factors Khan Academy: Unit Conversion within the Metric SystemConverting Units with Conversion Factors TutorialExplained Practice Problems