Here are some useful worksheets that I have found around the web. Please let me know if you find any broken links!

Chapter 1 (Matter, Measurement, and Problem Solving)

Chapter 2 (Atoms and Elements)

Chapter 3 (Molecules, Compounds, and Chemical Equations)

Chapter 4 (Chemical Reactions and Chemical Quantities)

Chapter 5 (Introduction to Solutions and Aqueous Reactions)

Chapter 6 (Gases)

Chapter 7 (Thermochemistry)

Chapter 8 (The Quantum-Mechanical Model of the Atom)

Chapter 9 (Periodic Properties of the Elements)

Chapter 10 (Chemical Bonding 1: The Lewis Model)

Chapter 11 (Chemical Bonding 2: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory)