Learners view several movie clips that demonstrate the use of an indicator to follow the neutralization reaction that occurs when an acid and a base are mixed. Students test their knowledge in a series of questions. Immediate feedback is given.

Learners examine phase diagrams that show the phases of solid, liquid, and gas as well as the triple point and critical point.

In this interactive object, learners identify charges on ions, write new formulas based on charge, and balance equations using coefficients.

Roman numerals are used to identify the charges on metal cations having multiple oxidation states. Five examples are provided for practice.