A curious old guy.
The W's Enrolled Lessons

3 minSign Language lesson2 CQ
Conversing about school is important for kids and teachers, so why not learn some ASL school signs? Practice terms including math, science, history, and gym.
with SignwithkristaConversing about school is important for kids and teachers, so why not learn some ASL school signs? Practice terms including math, science, history, and gym.

3 minFREEChemistry lessonFree2 CQ
Learn to distinguish solids from liquids and gases, differentiate chemical changes from physical changes, and identify elements, compounds, and mixtures.
Learn to distinguish solids from liquids and gases, differentiate chemical changes from physical changes, and identify elements, compounds, and mixtures.

3 minChemistry lesson2 CQ
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 determine the number of significant figures in a number, round accurately, and add, subtract, multiply, and divide numbers with sig figs.

4 minChemistry lesson3 CQ
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.
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.

4 minChemistry lesson3 CQ
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.
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.

4 minChemistry lesson3 CQ
Knowing how to read nuclear symbols is an important chemistry skill. In this lesson, Professor Dave shows you how to interpret them with ease.
Knowing how to read nuclear symbols is an important chemistry skill. In this lesson, Professor Dave shows you how to interpret them with ease.

3 minChemistry lesson2 CQ
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.
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.

5 minChemistry lesson3 CQ
Professor Dave offers an easytounderstand explanation of moles, stoichiometry, and the rules for solving stoichiometric calculations in this chemistry lesson.
Professor Dave offers an easytounderstand explanation of moles, stoichiometry, and the rules for solving stoichiometric calculations in this chemistry lesson.

4 minChemistry lesson3 CQ
Professor Dave explains limiting reagents in an easytounderstand fashion. Learn to calculate the amount of end product, percentage yield, and more.
Professor Dave explains limiting reagents in an easytounderstand fashion. Learn to calculate the amount of end product, percentage yield, and more.

3 minChemistry lesson2 CQ
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!
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!