Inquiry in Action is a great site from the American Chemical Society that provides classroom activities for science teachers. There are downloadable materials, step by step instructions with pictures and much more.
This is the kind of site that I love to find. It has great resources, is free, and is sponsored by a group that is expert in the topic.
There is a very nice chemistry review section and the materials are good for general science and chemistry classes.
You can download the book, "Inquiry in Action, Investigating Matter Through Inquiry" free in PDF form. They also sell a printed version in a 3 ring binder for $24.95.
I love inquiry as a learning tool, but often find myself having a hard time creating inquiry activities. This book is a great resource and can also help you create modified activities .