CH 221 Online Extra Credit Problems

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Chapter One: Essential Ideas

  1. Significant Figures
  2. Scientific Notation
  3. Predicting Exponents
  4. Direct and Inverse Relationships
  5. Direct/Inverse Problems
  6. General 3 Variable #1
  7. General 3 Variable #2
  8. General 3 Variable #3
  9. Percentages
  10. Mass, Density and Volume
  11. Converting Volume
  12. Converting Mass
  13. Converting Distance
  14. Converting Density
  15. Converting Temperature
  16. Metric Conversions
  17. More Metric Conversions

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Chapter 2 Part 1: Atoms, Molecules and Ions

  1. Protons, Electrons and Neutrons

Chapter 2 Part 2: Atoms, Molecules and Ions

  1. Simple Nomenclature - Formulas to Names
  2. Simple Nomenclature - Names to Formulas
  3. Transition Metal Nomenclature
  4. Elements, Moles and Mass
  5. Calculating the Molar Mass of a Compound
  6. Mass, Moles and gfw
  7. Word Problems - Elements and Moles
  8. Chemical Formulas and Mass Relationships
  9. Calculations based on Chemical Formulas
  10. Using Molar Volume
  11. Density, Elements, Mass and Moles
  12. Exercises in Comparison
  13. Further Exercises in Comparison
  14. Additional Exercises in Comparison
  15. Percent Composition
  16. Empirical Formulas From Percent Composition

Chapter 4 Part I: Stoichiometry of Chemical Reactions

  1. Balancing Chemical Reactions
  2. Basic Stoichiometry - Grams to Moles
  3. Basic Stoichiometry - Moles to Moles
  4. Basic Stoichiometry - Grams to Grams
  5. Limiting Reagents
  6. Using Limiting Reagents
  7. Calculations Based on Percent Yields
  8. Combining Limiting Reagent and % Yield
  9. Combustion Analysis

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Chapter 4 Part II: Stoichiometry of Chemical Reactions

  1. Mixing Soluble Salts
  2. Oxidation Numbers
  3. Identifying Redox Components
  4. Molarity, Moles and Volume
  5. Molarity, Mass and Volume
  6. Dilution

Chapter 5: Thermochemistry

  1. Energy, Heat and Work
  2. Energy, Heat and Work - Word Problems
  3. Heat and Temperature Changes for Water
  4. Heat Transfer - Water
  5. Heat Transfer - Two Samples of Water
  6. Heat Transfer - Water and Another Substance
  7. Hess's Law
  8. Thermochemical Equations
  9. Using Heats of Formation

Chapter 6 Part I: Electronic Structure and Periodic Properties of Elements

  1. Wavelength, Frequency and Energy
  2. Atomic Spectrum of Hydrogen
  3. The de Broglie Wave Equation

Chapter 6 Part 2: Electronic Structure and Periodic Properties of Elements

  1. Electronic Structures of Atoms and Ions
  2. The Quantum Numbers

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