FaceTime can make your iPad a communications powerhouse. This lesson shows you how to make audio and video calls, and integrate them with the Contacts app.

Explore light reactions, the Calvin cycle, and the equation for photosynthesis that allows plants to use carbon dioxide and energy from the sun to form glucose.

This lesson teaches you more about photosynthesis and how plants take energy from the sun to generate ATP, NADPH, and oxygen through light reactions.

Learn about the processes that take place during the photosynthesis light reactions, including how chemiosmosis drives the production of ATP.

Learn how the Calvin cycle uses the ATP and NADPH formed during the light reactions to generate glucose - fulfilling the ultimate purpose of photosynthesis.

Learn how plant physiology affects the efficiency of photosynthesis and how the C4 and CAM pathways address issues like that of photorespiration.

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.