In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.

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

In this interactive object, the learner examines how pressure and volume relate to each other.

In this animated and interactive object, learners examine kinetic and potential energy as well as the first law of thermodynamics and the flow of energy between a system and its surroundings. Students also answer questions about exothermic and endothermic reactions