Khan Academy
Khan Academy: What Is Displacement?
Learn the definitions of position, displacement, distance, and distance traveled and view examples of each.
Khan Academy
Khan Academy: Double Replacement Reactions
Definition and examples of double replacement reactions. Predicting and balancing neutralization and precipitation reactions.
Clackamas Community College
Clackamas Community College: Single Replacement Reactions
A very useful site that includes examples of replacement reactions as well as exercises for practicing balancing replacement reactions.