This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter two provides practice and demonstrations of the distinction between physical and chemical properties.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter three part one provides practice and demonstrations related to atomic structure in chemistry.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter four provides practice and demonstrations related to nuclear chemistry.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter five provides practice and demonstrations related to moles, molarity, and reaction types in chemistry.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter six provides practice and demonstrations related to stoichiometry chemistry.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter seven provides practice and demonstrations related to gas laws in chemistry.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter eight provides practice and demonstrations in chemistry related to Atomic Structure, (this is part two).

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. Chapter nine provides practice and demonstrations related to chemical bonding and geometry.

This collection of videos, animations and documents comes from the NCSSM AP chemistry online course. This introduction provides practice and demonstrations of basic concepts of chemistry such as significant figures and the distinction between physical and chemical changes.

Series of videos on the Chemistry created by the team at Crash Course

This question is addressed through a series of questions and answers, each providing related introductory information such as how climate change is studied, the history of Earth‰Ûªs climate, and the effects of climate change on Earth‰Ûªs geology and biology. The Climate Kids website is a NASA education resource featuring articles, videos, images and games focused on the science of climate change.

Use the imbedded sliding scale to observe changes in sea ice distribution, carbon emission levels and average global temperatures over time, as well as the effects of variations in sea level rise along coastal regions. This interactive is part of the Climate Kids website, a NASA education resource featuring articles, videos, images and games focused on the science of climate change.

Watch your solution change color as you mix chemicals with water. Then check molarity with the concentration meter. What are all the ways you can change the concentration of your solution? Switch solutes to compare different chemicals and find out how concentrated you can go before you hit saturation!

Experiment with conductivity in metals, plastics and photoconductors. See why metals conduct and plastics don't, and why some materials conduct only when you shine a flashlight on them.

This 11-minute video lesson works through a calculation for K-Ar dating (it is good to have some prior experience with e and logarithms to understand). [Cosmology and Astronomy playlist: Lesson 80 of 85]

This 11-minute video lesson looks at Potassium-Argon (K-Ar) dating and it can be used to date very old volcanic rock and the things that might be buried in between. [Cosmology and Astronomy playlist: Lesson 79 of 85]

Simulate the original experiment that proved that electrons can behave as waves. Watch electrons diffract off a crystal of atoms, interfering with themselves to create peaks and troughs of probability.

This feature article from the National Aeronautics and Space Administration (NASA) Earth Observatory discusses the use of satellite imagery to evaluate desertification which is occurring in the Sahel, a region of central African savannah that forms the boundary between the Sahara Desert to the north and the wetter, more fertile regions to the south. Topics include the use of Very High Resolution Radiometer (VHRR) data, obtained from National Oceanic and Atmospheric Administration (NOAA) meteorological satellites, to develop a vegetation index, and exactly how the term 'desertification' should be defined in order to distinguish temporarily degraded land from that which has permanently lost productivity.

Concluding a two-part lab activity, students use triple balance beams and graduated cylinders to take measurements and calculate densities of several household liquids and compare them to the densities of irregularly shaped objects (as determined in Part 1). Then they create density columns with the three liquids and four solid items to test their calculations and predictions of the different densities. Once their density columns are complete, students determine the effect of adding detergent to the columns. After this activity, present the associated Density & Miscibility lesson for a discussion about why the column layers do not mix.

These two hands-on labs are about the role of temperature and salinity in governing the density of seawater, a major factor controlling the ocean's vertical movements and layered circulation. In the first activity students work in groups to determine the density of tap water and of tap water with salt, then compare the densities. The second activity investigates the role of temperature and salinity in determining seawater density. Students use a Temperature-Salinity (T-S) Diagram to examine the effect of mixing on density. A list of key concepts, essential questions, common preconceptions and more is included. These are part of the Aquarius Hands-on Laboratory Activities.