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.

Knowing how to read nuclear symbols is an important chemistry skill. In this lesson, Professor Dave shows you how to interpret them with ease.

Begin by looking at the construction of a chemical equation and discovering what it means. Then, practice balancing a few chemical equations in this lesson.

Professor Dave offers an easy-to-understand explanation of moles, stoichiometry, and the rules for solving stoichiometric calculations in this chemistry lesson.

Professor Dave explains limiting reagents in an easy-to-understand fashion. Learn to calculate the amount of end product, percentage yield, and more.

How do you find out how much of each atom is in a compound? Elemental analysis can help you figure this out, and in this lesson, Professor Dave shows how!

Review the properties of a gas, then learn about gas pressure, temperature, volume, and moles, and see how each of these relate using the ideal gas law.