Article
Khan Academy

Khan Academy: What Is Displacement?

For Students 9th - 10th
Learn the definitions of position, displacement, distance, and distance traveled and view examples of each.
Article
Khan Academy

Khan Academy: Double Replacement Reactions

For Students 9th - 10th
Definition and examples of double replacement reactions. Predicting and balancing neutralization and precipitation reactions.
Handout
Clackamas Community College

Clackamas Community College: Single Replacement Reactions

For Students 9th - 10th
A very useful site that includes examples of replacement reactions as well as exercises for practicing balancing replacement reactions.