In this interactive object, students examine how the volume and temperature of an ideal gas relate under conditions of constant pressure and quantity.

Boyle's Law states that gas volume varies inversely with the pressure at constant temperature and is described by the equation PV = constant. An example of a sample of gas at two conditions of P and V is used to illustrate the law.

In this interactive and animated object, students distribute the valence electrons in simple covalent molecules with one central atom. Six rules are followed to show the bonding and nonbonding electrons in Lewis dot structures. The process is well illustrated with eight worked examples and two interactive practice problems.

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