Vision Learning
Vision Learning: States of Matter
Did you know the ancient Greeks first identified the three states of matter? Read about how the molecules differ in solids, liquids, gases, and plasma. View photographs and watch how the molecules move in each state. If you're really...
Simon Fraser University
Chem1 Virtual Textbook: Densities of Substances and Materials
As part of a larger site called "Getting started in Chemistry," this site examines various topics related to the densities of substances and materials. Included in the study are properties of solids, liquids and gases, and how density is...
Museum of Science
The Atom's Family: Mighty Molecules
In this activity, students construct models of molecules using marshmallows and gum drops.