Light: is it a wave or a particle? How about both? In this quantum mechanics lesson, learn about two experiments that established wave particle duality.

In this advanced physics lesson, build on the concept of the photoelectric effect by running through some more intense calculation examples.

In this physics lesson, learn about the Heisenberg Uncertainty Principle by looking at it conceptually, then mathematically with an equation.

In this quantum mechanics lesson, learn about the development of the de Broglie wavelength and what it has to do with kinetic energy and momentum.

In this quantum mechanics lesson, learn about an advanced concept known as the particle-in-a-box concept. Discover quantum mechanical models and how they work.

In this quantum mechanics lesson, learn about the hydrogen atom and how the Bohr model and the Rydberg equation describe an atom's energy levels.

Learn to distinguish solids from liquids and gases, differentiate chemical changes from physical changes, and identify elements, compounds, and mixtures.

Learn how to determine the number of significant figures in a number, round accurately, and add, subtract, multiply, and divide numbers with sig figs.

Learn how to use scientific notation to represent big and small numbers in a clean fashion. Then look at dimensional analysis and scientific unit conversion.

Take a historical stroll down chemistry lane. Learn how early atomic truths were unveiled, and take a look at some of the early atomic structure models.