These videos are posted to help with problem solving. Each video contains worked out solutions to chemistry problems. Please click the title you would like to view.

**Acid/Base Chemistry**

Neutralization Reaction and Determination of Molarity

Determine pH, pOH, hydronium ion, and hydroxide ion

Calculate the pH of an Aqueous Solution of Weak Acid

Calculate the Base Dissociation Constant, Kb

Calculate pH after the Reaction of a Weak Base with a Strong Acid

Calculate pH of Buffer Solution: Buffers Part 1

Calculate pH of Buffer Solution Using Henderson-Hasslebalch Equation: Buffers Part 2

Calculate pH of Buffer Solution After Addition of NaOH: Buffers Part 3

Calculate pH Change of Buffer After Addition of NaOH: Buffers Part 4

Calculate pH of Buffer After Addition of a Strong Acid

Calculate pH of Buffer After Addition of a Strong Base

Polyprotic Acids, Equilibrium Concentrations, and pH

**ACID/BASE TITRATIONS**

Titration of a Strong Acid by a Strong Base

Titration of a Weak Acid by a Strong Base

Strong Acid Weak Base Titration

**ATOMIC MASS**

**ATOMIC STRUCTURE**

Electronic Structure of Atoms

**BONDING**

Calculate Lattice Energy

**CHEMICAL COMPOUNDS: COMPOSITION AND THE MOLE**

Calculate the mass percent composition of a compound

Determine the empirical and molecular formulas from combustion analysis

Calculate the amount of carbon dioxide produced from the combustion of a mixture of hydrocarbons

**CHEMICAL REACTIONS**

Writing and Balancing Chemical Equations

Determine which species is oxidized and which is reduced

**CONVERSION FACTORS AND CHEMISTRY PROBLEM SOLVING**

What are Conversion Factors and how do we Set up Conversion Factors?

Simple One-Step Conversions: Convert from mg to g, inches to cm, and g to lbs

Multi-Step Conversions: Convert gallons to cm^{3} and convert L to drops

Convert volume from cubic centimeters to cubic inches

**DENSITY**

Calculate density of a metal cube and determine volume of ethanol needed

**ELECTROCHMISTRY**

Electrochemistry I–Review of Oxidation/Reduction and Balancing Redox Equations

Electrochemistry II — Voltaic Cells, Cell Diagrams, and Standard Potentials

Electrochemistry III — The Nernst Equation, Concentration Cells, Batteries, Corrosion

Electrochemistry IV — Electrode Potential, Spontaneity, and Equilibrium

Electrochemistry V — Quantitative Description of Electrolytic Cells–Electrolysis

**ELECTRONIC STRUCTURE**

Write Electron Configurations and Determine the Number of Valence Electrons

Electron Configuration and Orbital Box Diagram for First Excited State

**EQUILIBRIUM**

Calculation of the Equilibrium Constant (Kc)

Calculate Kc for a Reverse Reaction or When Coefficients have Been Multiplied

Equilibrium: Convert between Kp and Kc

Equilibrium Constants and Balanced Equations

Equilibrium Problems Part 1: Calculate Kc

Equilibrium Problems Part 2: Calculate Equilibrium Concentrations and Make Simplifying Assumption

Equilibrium Problems Part 3: Calculate Kc if given an initial concentration

Equilibrium Problems Part 4: Calculate Equilibrium Concentrations when given Kc

Equilibrium Problems Part 6: Calculate Equilibrium Concentrations when given Kc and all initial concentrations (use Qc)

**GASES, GAS LAWS, AND KINETIC MOLECULAR THEORY**

Calculate the Density of a Gas at STP

Rearrange the Ideal Gas Law to Solve for Density or Molar Mass

Using the Ideal Gas Law to Determine Molar Mass

Using the Ideal Gas Law to Density of a Gas at STP

Use the Combined Gas Law to Solve for Volume (Charles’s Law)

Use the Combined Gas Law to Solve for Temperature

Collection of Gas Over Water and Reaction Stoichiometry

**KINETICS**

Determine reaction order and rate constant from initial rates

Second Order Decomposition of NO_{2} (g)

Calculate the initial concentration of reactant if given half life and final concentration

Determine the age of an Object using Half-Life of Carbon-14

Calculate the Activation Energy Using the Arrhenius Equation

**MOLAR MASS, GRAMS, MOLE, NUMBER OF PARTICLES CONVERSION PROBLEMS **

Molar Mass, Converting from Moles to Grams and Grams to Moles, and Avogadro’s Number

Converting between Moles, Grams, Number of Ions, and Number of Molecules

**ORGANIC CHEMISTRY**

Naming Substituted Cycloalkanes

Drawing Chair Conformers Cyclohexane (Ring Flip)

Draw a Lewis Structure and Determine Formal Charges

Cyclic Compounds R and S Configurations

Draw and Label E and Z Isomers: Skeletal Structures

Ether Cleavage: Nucleophilic Substitution

**PHASE CHANGES**

Enthalpy Change when Ice is Converted to Steam

**PROPERTIES OF LIQUIDS**

Using enthalpy of vaporization in calculations

Calculation of Enthalpy of Vaporization using Clausius-Clapeyron Equation

**SOLUTIONS**

Calculate the Enthalpy of Hydration from Heat of solution and Lattice energy

Preparation of a Solution by Dilution

Calculate molarity and molality of concentrated nitric acid

Calculate molarity, molality, and mole fraction

**STOICHIOMETRY**

Simple Stoichiometry Part 1 emphasis on mole ratios and setting up a road map

Simple Stoichiometry Part 2 emphasis on limiting reactant

Stoichiometry Part 3 emphasis on conversions between moles and grams with limiting reactant

Stoichiometry Part 4 Calculate the percent yield of product

Neutralization Reaction and Determination of Molarity

**STRUCTURE**

Draw simple Lewis structures and determine molecular shape

Determine Atomic Radius From Unit Cell and Density

**TEMPERATURE CONVERSIONS**

Formulas for Temperature Conversions

Convert Degrees Celsius to Degrees Fahrenheit and Kelvin

**THERMOCHEMISTRY**

Use Hess’s Law to calculate enthalpy change for a reaction

Use Hess’s Law to determine enthalpy change for vaporization of CS_{2}

Determine the temperature change when benzoic acid is burned in a bomb calorimeter

Using Specific Heat Capacity to Determine a Final Temperature

Coffee cup Calorimetry: Determine enthalpy change of reaction

Drawing and Enthalpy Diagram for an Exothermic Reaction

**GOB CHEMISTRY Lecture Videos**

**CHEMISTRY 161 VIDEO LESSONS**

CHM 161 Video Lessons For Preparatory Chemistry

**CHM 261 Lecture Videos**

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