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

In this animated object, students examine the role that the solubility of water plays in various biological functions.

Learners observe that the volume of one mole of any gas is 22.4 L at standard temperature and pressure. An illustration shows that only the mass of the molar volume differs with the identity of the gas.

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.