Chemistry and Math

• Significant Figures
• Significant Figures in Addition, Subtraction Multiplication, and Division
• Significant Figures Practice Problems
• Converting Units With Conversion Factors Dimensional Analysis
• Conversion Factors and Dimensional Analysis Practice Problems
• Density Practice Problems

The Components of Matter

• Pure Substances, Mixtures, Elements, and Compounds
• Heterogeneous and Homogeneous Mixtures
• States of Matter: Solid, Liquid, Gas, and Plasma

Atoms, Molecules, and Ions

• Subatomic particles and Isotopes
• What are Isotopes?
• How To Calculate The Number of Protons, Neutrons, and Electrons
• The Average Atomic Mass
• Calculating The Percent Abundance of Each Isotope
• Naming Monatomic and Polyatomic Ions
• Naming Ionic Compounds
• Writing Chemical Formulas For Ionic Compounds
• Naming Covalent Compounds
• Naming Acids and Bases
• Atomic and Molecular Masses

Stoichiometry

• The Mole and Molar Mass
• How To Calculate The Molar Mass
• How To Convert Grams To Moles
• Grams to Molecules and Molecules to Mass
• How To Convert Grams To Number of Atoms
• Mass, Moles, and Number of Particles Practice
• Percent Composition and Empirical Formula
• Percent Composition and Empirical Formula Practice Problems
• Stoichiometry of Chemical Reactions
• Limiting Reactant
• How To Find The Amount of Excess Reactant
• Limiting Reactant Practice Problems
• Reaction/Percent Yield
• Stoichiometry Practice Problems
• Mass, Moles, and Number of Particles Quiz
• The Stoichiometry of Chemical Reactions Quiz

Reactions in Aqueous Solutions

• Solutions
• Strong and Weak Electrolytes
• Dissociation of Ionic Compounds
• Molecular, Ionic, and Net Ionic Equations
• Molarity 
• Dilution
• Ion Concentration
• Precipitation Reactions
• Definitions of Acids and Bases
• Naming Acids and Bases
• Acid-Base Reactions
• Displacement Reactions
• Predicting The Products of Chemical Reactions
• Stoichiometry of Reactions in Aqueous Solutions
• Acid-Base Titrations
• Oxidation State
• Oxidation-Reduction (Redox) Reactions
• Balancing Redox Reactions
  Oxidizing and Reducing Agents
• Oxidation State Practice Problems
  Reactions in Aqueous Solutions – Practice Problems
  Reactions in Aqueous Solutions Quiz

Gases

• Boyle’s Law
• Charle’s Law
• Gay-Lussac’s Law
• Avogadro’s Law
• The Ideal Gas Law
• Celsius or Kelvin
• Ideal-Gas Laws
• Combined Gas Law Equation
• How to Know Which Gas Law Equation to Use
• Molar Mass and Density of Gases
• Graham’s Law of Effusion and Diffusion
• Graham’s Law of Effusion Practice Problems
• Dalton’s Law of Partial Pressures
• Mole Fraction and Partial Pressure of the Gas
• Gases in Chemical Reactions
• Gases-Practice Problems
• A Multiple-Choice Quiz on Gases

Thermochemistry

• Energy Related to Heat and Work
• Endothermic and Exothermic Processes
• Heat Capacity and Specific Heat
• Heat Capacity Practice Problems
• Heat and Phase Change Diagrams
• What is Enthalpy
• Constant-Pressure Calorimetry
• Bomb calorimeter – Constant Volume Calorimetry
• Calorimetry Practice Problems
• Stoichiometry and Enthalpy of Chemical Reactions
• Hess’s Law and Enthalpy of Reaction
• Hess’s Law Practice Problems
• Standard Enthalpies of Formation
• Enthalpy of Reaction from Enthalpies of Formation
• Thermochemistry Practice Problems
• Thermochemistry Quiz

Electronic Structure of Atoms

• Atomic Orbitals
• Electron Configurations
• Electron Configurations of Ions
• Orbital Diagrams
• Aufbau’s Principle, Hund’s Rule, and Pauli’s Exclusion Principle
• Hund’s Rule
• Pauli Exclusion Principle
• Quantum Numbers (n, l, m_l, m_s)
• Bohr Model of the Hydrogen Atom
• Rydberg Formula
• The Photoelectric Effect
• Calculating The Energy of a Photon
• Effective Nuclear Charge
• Atomic Radius
• Ionic Radius
• Ionization Energy
• Electron Affinity
• Energy, Wavelength, and Frequency Practice Problems
• Electronic Structure of Atoms Quiz
• Periodic Table and Periodic Trends

Concepts of Chemical Bonding

• Lewis Dot Symbols
• Valence Electrons
• The Ionic Bond
• The Covalent Bond
• Sigma and Pi Bonds
• Electronegativity and Bond Polarity
• The Octet Rule
• Formal Charges
• Lewis Structures and the Octet Rule
• Lewis Structures Practice Problems
• Resonance Structures
• Chemical Bonding and Lewis Structures Quiz

Molecular Geometry

• The VSEPR Model
• VSEPR Theory Practice Problems
• Hybridization of Atomic Orbitals
• sp, sp², sp³, sp³d, and sp³d² Hybridization Practice Problems
• Geometry and Hybridization Quiz