Here’s a comprehensive site that covers all natures of matter. There are sections on the structure of matter, states of matter, compounds and mixtures, and properties of matter. Each section has several pages of explanation and description. After you’ve learned all you can about each concept of matter, you can do at least two activities that review what you know. Learn the equations for density, volume, and mass, and see how each is related to the other two.
courtesy of Knovation