Videos


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

Conjugate Acid-Base Pairs

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
 

Calculate the Weighted Average Atomic Mass when given the atomic masses of isotopes and their percent abundance
 

ATOMIC STRUCTURE
Electronic Structure of Atoms

Using the Rydberg Equation
 

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

Predict if a precipitate will form, write an ionic and net ionic equation, and indicate the spectator ions

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 cm3 and convert L to drops

Multi-Step Conversions: convert from miles to km and convert number of carbon atoms to ounces of carbon

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 5: Calculate Equilibrium Concentrations when given Kc and initial concentrations

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 NO2 (g)

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

Reaction Mechanism with Two Fast Equilibrium Steps: Determine if Mechanism is Consistent with Observed Rate Law

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)

Enantiomeric Excess

Alkane Nomenclature

Draw a Lewis Structure and Determine Formal Charges

Draw the two chair conformations for a disubstituted cyclohexane and determine which conformer is most stable

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

Use the enthalpy of sublimation of dry ice to determine the mass of dry ice needed to cool a given mass of water

Calculation of Enthalpy of Vaporization using Clausius-Clapeyron Equation

SOLUTIONS

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

Calculate molarity of a solution and calculate the number of grams of solute needed to prepare a solution of given molarity and volume

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 CS2

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

Stoichiometry and Thermochemical Equations: Determine the amount of heat produced for given amount of product or reactant

Drawing and Enthalpy Diagram for an Exothermic Reaction

GOB CHEMISTRY Lecture Videos

GOB Chemistry Lecture Videos

CHEMISTRY 161 VIDEO LESSONS

CHM 161 Video Lessons For Preparatory Chemistry

CHM 261 Lecture Videos

CHM 261 Chapter 4 Video 1

CHM 261 Chapter 4 Video 2

CHM 261 Chapter 5 Video 1

 
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