In this interactive object, the learner reads a case study and then determines appropriate assessment, planning, and intervention strategies necessary during the detoxification phase.

Students read different definitions of "acids" and "bases." In an interactive exercise, they identify if a substance is an acid or a base.

Learners observe that the melting of a solid and the freezing of its liquid occur at the same temperature. The melting point is an intrinsic property and is used to identify a substance.

In this animated object, students observe how ATP energy is used to move substances across the cell membrane from an area of lower concentration to an area of higher concentration and when something too large needs to get in or out of a cell.

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