+ Unit 2 Notes Videos

+ Unit 2, Part 1
+ Unit 2, Part 2
+ Unit 2, Part 3
+ Unit 2, Part 4
+ Unit 2, Part 5
+ Unit 2, Part 6
+ Unit 2, Part 7
+ Unit 2, Part 8
+ Unit 2, Part 9

History of Atomic Theory

Another Overview of Atomic History (Crash Course)
Overview of Atomic Theory History 
Another (Excellent) Overview of Atomic History Theory
JJ Thomson and the Cathode Ray Tube
Millikan Oil Drop Experiment
Ernest Rutherford and the Gold Foil Experiment (Discovering the Nucleus)
How to Draw Bohr Model Atom Diagrams

Isotopes

What is an isotope?
Isotope Notation
Calculating Average Atomic Mass from Percent Abundance
Calculating Percent Abundance of Isotopes given Average Atomic Mass (Harder)

Ions and Ionic Compound Nomenclature (Naming)

What is an ion?
What's the Difference between Ionic and ​Molecular/Covalent Compounds?
Balance those charges! Introduction to Binary Ionic Compounds (No Polyatomic Ions)
Naming Ionic Compounds (Ben's Chem Videos)
Transition Metals in Ionic Chemical Formulas
Introduction to Polyatomic Ions
+ Polyatomic Ions Mnemonic
Polyatomic Mnemonic: NICK the CAMEL -ate a CLAM for SUPPER in PHOENIX
Polyatomics and their Affixes: per__ate, __ate, __ite, hypo__ite
+ Naming Binary and Ternary Ionic Compounds
Naming Ionic Compounds with Transition Metals, from the Formula
Naming Ionic Compounds with Polyatomic Ions (Ternary Compounds)
+ Writing Ionic Formulas from Names
+ Even More Ionic Naming Practice/Review (Formula to Name, and Name to Formula)

Combining Concepts: Ions and Isotopes

Ions and Isotopes (Professor Dave Examples)

Molecular/Covalent Compound Nomenclature

Prefixes for Numbers (mono-, di-, tri-, tetra-, penta-, etc.)
Naming Molecular Compounds (Ben's Chem Videos)
Naming Molecular Compounds (Tyler DeWitt)
Naming Molecular Compounds (Brightstorm)
+ Naming Molecular Compounds Review/Practice 

Naming Acids and Bases

Introduction to Naming Acids (Must know polyatomic ions)
Naming Acids Practice & Examples
Naming Acids & Bases Together
    (Naming bases is easier. Bases are generally the metal + the ending "hydroxide")
    Base naming example: KOH is potassium hydroxide.

Molar Relationships & Conversions
+ Molar Conversions: Heart Chart Summary
Introduction to The Mole and Avogadro's Number
Calculating Molar Mass from a Chemical Formula
Using Molar Mass in Molar Conversions: Grams to Moles, or Moles to Grams
Using Molar Mass in Molar Conversions: Grams to Moles, or Moles to Grams (Part II)
Using Avogadro's Number in Molar Conversions: Number of Particles to Moles
Using Avogadro's Number in Molar Conversions: Number of Particles to Moles (Part II)
Gas Conversions at STP: 1 mole of any gas has a volume of 22.4 L at STP
Molar Ratios (Pre-Stoichiometry)
+ Converting Grams to # of Particles (Atoms)
Going Through The Mole: Grams to # of Particles
+ Converting # of Particles (Molecules) to Grams
Going Through The Mole: # of Particles to Grams
Multi-step Molar Conversions with Gases at STP (Example #1)
Multi-step Molar Conversions with Gases at STP (Example #2)
+ Molar Volume of Gas in a Cylinder at STP (Advanced)
Using Density in Molar Conversions
Advanced Concepts in Molar Conversions