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
- Methane - CH4
- Ammonia - NH3
- Water - H2O
- Carbon dioxide - CO2
- Hydrogen cyanide - HCN
- Ethane - C2H6
- Ethyne - C2H2
- Formaldehyde - CH2O
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. The solutions are a from a Practice Benchmark.
- Problem #1 - Converting Moles to Grams
- Problem #2 - Converting Grams to Moles
- Problem #3 - Converting Moles to Liters
- Problem #4 - Converting Liters to Moles
- Problem #5 - Converting Atoms to Moles
- Problem #6 - Converting Moles to Molecules
- Problem #7 - Converting Molecules to Grams
- Problem #8 - Converting Grams to Liters
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
- Problem #4 - Converting Liters to Moles
- Problem #8 - Converting Grams to Moles
- Problem #10 - Converting Liters to Moles
- Problem #11 - Converting Liters to Liters
- Problem #15 - Converting Liters to Grams
These problems are from our practice benchmark.
- Problem #1 - Converting Moles to Moles
- Problem #2 - Converting Moles to Liters
- Problem #3 - Converting Grams to Moles
- Problem #4 - Converting Grams to Liters
- Problem #5 - Converting Moles to Grams
- Problem #6 - Converting Moles to Liters
- Problem #7 - Converting Grams to Liters
- Problem #8 - Converting Grams to Grams
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)
- Problem #2a - Boyle's law (P and V)
- Problem #1b - Charles' law (V and T)
- Problem #2b - Charles' law (V and T)
- Problem #1c - Gay Lussac's law (P adn T)
- Problem #2c - Gay Lussac's law (P adn T)
- Problem #1d - Combined law (P, V and T)
- Problem #2d - Combined law (P, V and T)
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
- Problem #2 - Grams per Liter
- Problem #3 - Molarity
- Problem #4 - Molarity
- Problem #5 - Percent Composition
- Problem #6 - Percent Composition
- Problem #7 - Parts per Million (ppm)
- Problem #8 - Parts per Million (ppm)
- A Comparison of the Methods of Calculation
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
- Problem #2 - Specific Heat
- Problem #4 - Specific Heat
- Problem #7 - Specific Heat
- Problem #9 - Latent Heat
- Problem #10 - Latent Heat
- Problem #14 - Latent Heat
- Problem #15 - Latent Heat