Many chemical reactions are reversible, and the forward and backward reactions can occur at the same time. When the rate of the forward reaction is equal to the rate of the backward reaction, we call that a dynamic equilibrium. We will learn how equilibrium can be described by the equilibrium constant K, and how different factors than can affect the chemical equilibrium.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

We are now going to delve into the heart of chemistry. We learn ways of representing molecules and how molecules react. To do this, we'll even think about "how many" of a molecule we have using a quantity called a "mole".

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

In this video produced for Teachers' Domain, learn about MIT professor Cathy Drennan's research into microorganisms that remove carbon dioxide, a greenhouse gas, from the atmosphere.

Have you ever wondered why salt is used to de-ice roads? In this activity, you will use the same chemistry principles to hoist ice cubes with a piece of string. Is it possible to do this without getting your hands cold? Try the activity and see what a pinch of salt can do!

Using the mass defect to calculate the energy released when a helium nucleus formed. Introduction to the nuclear strong force. [11:24]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Learn how atoms stick together to form a bond in this video. Video explains ionic, covalent, and metallic bonding. [13:21]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Anaken lives with his brother Kiko on a beautiful island. Today they are learning about life processes. Join them and find out what they learn.

An example of how ice can cause energy to transfer and reduce the temperature of water. [11:23]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

If Chinese is your native language and you want to learn English online, use this tutorial to learn commonly used English words.

Lessons include: (1) Chinese. Use this interactive tutorial to learn English if your native language is Chinese.

This video features the Chinese story "The Little Rabbits" in both English and Chinese.

Canadian Wildlife site features the Chipmunk. Highlights its habitats and habits, range, feeding and breeding characteristics.

Students focus on the three interconnected choices global society faces as Earth's climate continues to change -- suffer, adapt, and mitigate -- to analyze and predict current and future impacts to Earth's systems. Using videos excerpted from NOVA: Decoding the Weather Machine, students explore ways that adaptation and mitigation strategies can work at various levels to minimize suffering and then develop an evidence-based action plan for their local community

A tutorial explaining how to use technology to create graphics and visuals to enhance documents and presentations. A brief audiovisual presentation identifies types of visuals, and another audiovisual presentation describes how and when to use nine types of graphics. Also includes a slideshow describing the technology needed to create graphics and a list of questions to help determine when to use graphics and visuals in documents or presentations. [19], [7:17] SL.9-10.5 Audio Visuals, SL.11-12.5 Audio Visuals

The traditional religions of Great Britain's North American colonies had difficulty maintaining their holds over the growing population. This did not, however, result in a wholesale decline in religiosity among Americans.  In fact, the most significant religious development of 18th century America took place along the frontier, in the form of the Great Awakening. This curriculum unit will, through the use of primary documents, introduce students to the First Great Awakening, as well as to the ways in which religious-based arguments were used both in support of and against the American Revolution.

Learn all about browsing, customizing, and bookmarking in Chrome, as well as personalizing your privacy and security settings.

Lessons include: (1) Getting Started with Google Chrome. Learn how to get started with Google Chrome. (2) Browsing in Chrome. Learn how to browse in Chrome. (3) Customizing Chrome. Learn how to customize Chrome so it's user friendly for you. (4) Bookmarking in Chrome. Learn how to bookmark in Chrome to save your favorite sites. (5) Privacy and Security in Chrome. Learn all about privacy and security in Chrome.

In this free tutorial, you'll learn more about Chromebooks as a low-cost alternative to traditional laptops.

Lessons include: (1) What is a Chromebook?. Learn what a Chromebook is and how it differs from a tablet or a laptop. (2) Choosing Between a Chromebook and a Laptop. Learn the similarities and differences between a Chromebook and a laptop. (3) Getting to Know the Chromebook Interface. Get to know the Chromebook interface, including common functions. (4) Migrating to a Chromebook. Learn how to migrate your files and information to a Chromebook. (5) Chromebook Settings and Customization. Learn all about Chromebook settings and customization. (6) Printing with a Chromebook. Learn how to print from your Chromebook.

This site from the Chulalongkorn University contains general information on skimming and scanning when reading.

Adafruit founder Limor Fried and virtual reality designer Nat Brown show how simple logical circuits underlie everything your computer does. [4:44]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

From The Physics Classroom. Uses easy- to-understand language to discuss how circular motion principles apply to the motion of satellites. Describes the tangential velocity and centripetal acceleration of a satellite. Includes many diagrams and a Check Your Understanding section.

Sal Khan introduces the circulatory system function and the structure and function of the heart. [14:53]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.