This video/animation shows that a molecule of water is made up of oxygen and hydrogen atoms. When oxygen and hydrogen atoms exist alone, their properties are different from the properties they have when they are chemically combined to...

Bill Nye explains all about the matter in the universe. Learn about atoms and molecules, and how they make up all the "stuff" in the world. [22:42]

[Free Registration/Login Required] An informational text explaining the difference between atoms an molecules. A question sheet is available to help students build skills in reading comprehension.