# Chemistry Videos

On this page I am posting videos of problem solving methods used in chemistry. I create these with a tablet and screen capture software. The results are in Streaming Flash (.swf) and .mp4 format.

### Lewis Structures

These problems address the following CA standard: *Students know how to draw Lewis dot structures.* The examples are drawn from the Lewis Structures Worksheet used in class.

- The HONC rule ( SWF ) ( MP4 )
- Methane - CH
_{4}( SWF ) ( MP4 ) - Ammonia - NH
_{3}( SWF ) ( MP4 ) - Water - H
_{2}O ( SWF ) ( MP4 ) - Carbon dioxide - CO
_{2}( SWF ) ( MP4 ) - Hydrogen cyanide - HCN ( SWF ) ( MP4 )
- Ethane - C
_{2}H_{6}( SWF ) ( MP4 ) - Ethyne - C
_{2}H_{2}( SWF ) ( MP4 ) - Formaldehyde - CH
_{2}O ( SWF ) ( MP4 )

### Mole Conversion Problems

These problems address the following CA standard: *Students know how to determine the molar mass of a molecule from its chemical formula and a table of atomic masses and how to convert the mass of a molecular substance to moles, number of particles, or volume of gas at standard temperature and pressure. *

- Problem #1 - Converting Moles to Grams ( SWF ) ( MP4 )
- Problem #2 - Converting Grams to Moles ( SWF ) ( MP4 )
- Problem #3 - Converting Moles to Liters ( SWF ) ( MP4 )
- Problem #4 - Converting Liters to Moles ( SWF ) ( MP4 )
- Problem #5 - Converting Atoms to Moles ( SWF ) ( MP4 )
- Problem #6 - Converting Moles to Molecules ( SWF ) ( MP4 )
- Problem #7 - Converting Molecules to Grams ( SWF ) ( MP4 )
- Problem #8 - Converting Grams to Liters ( SWF ) ( MP4 )

### Stoichiometry Problems

These problems address the following CA standard: *Students know how to calculate the masses of reactants and products in a chemical reaction from the mass of one of the reactants or products and the relevant atomic masses. *

The solutions are from a sampling of problems from our Interactive Stoichiometry Problem Set.

- Problem #1 - Converting Moles to Moles ( SWF ) ( MP4 )
- Problem #4 - Converting Liters to Moles ( SWF ) ( MP4 )
- Problem #8 - Converting Grams to Moles ( SWF ) ( MP4 )
- Problem #10 - Converting Liters to Moles ( SWF ) ( MP4 )
- Problem #11 - Converting Liters to Liters ( SWF ) ( MP4 )
- Problem #15 - Converting Liters to Grams ( SWF ) ( MP4 )

These problems are from our practice benchmark.

- Problem #1 - Converting Moles to Moles ( SWF ) ( MP4 )
- Problem #2 - Converting Moles to Liters ( SWF ) ( MP4 )
- Problem #3 - Converting Grams to Moles ( SWF ) ( MP4 )
- Problem #4 - Converting Grams to Liters ( SWF ) ( MP4 )
- Problem #5 - Converting Moles to Grams ( SWF ) ( MP4 )
- Problem #6 - Converting Moles to Liters ( SWF ) ( MP4 )
- Problem #7 - Converting Grams to Liters ( SWF ) ( MP4 )
- Problem #8 - Converting Grams to Grams ( SWF ) ( MP4 )

### Gas Law Problems

These problems address the following CA standard: *Students know how to apply the gas laws to relations between the pressure, temperature, and volume of any amount of an ideal gas or any mixture of ideal gases.* These solutions are from the "warm up" problem sets used in class.

- Problem #1a - Boyle's law (P and V) ( SWF ) ( MP4 )
- Problem #2a - Boyle's law (P and V) ( SWF ) ( MP4 )
- Problem #1b - Charles' law (V and T) ( SWF ) ( MP4 )
- Problem #2b - Charles' law (V and T) ( SWF ) ( MP4 )
- Problem #1c - Gay Lussac's law (P adn T) ( SWF ) ( MP4 )
- Problem #2c - Gay Lussac's law (P adn T) ( SWF ) ( MP4 )
- Problem #1d - Combined law (P, V and T) ( SWF ) ( MP4 )
- Problem #2d - Combined law (P, V and T) ( SWF ) ( MP4 )

### Calculations of Solution Concentration

These videos demonstrate solutions to solution concentration problems. The problems come from a set of practice problems used in class, which address the CA standard: *Students know how to calculate the concentration of a solute in terms of grams per liter, molarity, parts per million, and percent composition.*

- Problem #1 - Grams per Liter ( SWF ) ( MP4 )
- Problem #2 - Grams per Liter ( SWF ) ( MP4 )
- Problem #3 - Molarity ( SWF ) ( MP4 )
- Problem #4 - Molarity ( SWF ) ( MP4 )
- Problem #5 - Percent Composition ( SWF ) ( MP4 )
- Problem #6 - Percent Composition ( SWF ) ( MP4 )
- Problem #7 - Parts per Million (ppm) ( SWF ) ( MP4 )
- Problem #8 - Parts per Million (ppm) ( SWF ) ( MP4 )
- A Comparison of the Methods of Calculation ( SWF ) ( MP4 )

### Thermochemical Calculations

These videos demonstrate solutions to thermochemical calculation problems. The problems come from a set of interactive practice problems used in class, which address the CA standard: *Students know how to solve problems involving heat flow and temperature changes, using known values of specific heat and latent heat of phase change. *

- Problem #1 - Specific Heat ( SWF ) ( MP4 )
- Problem #2 - Specific Heat ( SWF ) ( MP4 )
- Problem #4 - Specific Heat ( SWF ) ( MP4 )
- Problem #7 - Specific Heat ( SWF ) ( MP4 )
- Problem #9 - Latent Heat ( SWF ) ( MP4 )
- Problem #10 - Latent Heat ( SWF ) ( MP4 )
- Problem #14 - Latent Heat ( SWF ) ( MP4 )
- Problem #15 - Latent Heat ( SWF ) ( MP4 )