Learners examine the method for calculating the atomic weight of copper from the natural percent composition of each of its two isotopes.

In this animated object, learners view hydrogen and hydroxide ions in a solution. A brief quiz on the basic principles of the term pH completes the activity.

Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).

In this screencast we are introduced to the lab equipment used to contain and dispense chemicals.