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".
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.
China buys US Bonds. Created by Sal Khan.
China keeps peg but diversifies holdings. Created by Sal Khan.
China Pegs to Dollar to Keep Trade Imbalance. Created by Sal Khan.
Chinese Central Bank Buying Treasuries. Created by Sal Khan.
This podcast series consists of simple dialogue exchanges. The listening materials are suitable for beginners and help them take the first step toward becoming proficient listeners. The contents of these 72 dialogues are completely based on the beginning level Chinese curriculum; they are creative yet realistic scenarios on topics that listeners can relate to, such as the social, family and school aspects of one’s life. Full transcripts transcripts in both traditional and simplified characters as well as English translations are provided as downloadable PDF documents. The podcast format enables a generation of increasingly ‘mobile’ learners to study the material ‘on-the-go’.
A collection of video lessons on grammar topics for beginning Mandarin Chinese, available as a YouTube playlist.
An overview of the truly Imperial Chinese Dynasties including the Qin, Han, Sui, Tang, Song, Yuan, Ming and Qing. Discussion of innovations during Tang and Song China.
Chinese inflation. Created by Sal Khan.
Kinematic equations help solve for an unknown in a problem when an object has either a constant velocity or constant acceleration. This video will help you choose which kinematic equations you should use, given the type of problem you're working through.
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.
Overview of the changing relationship between the Roman Empire and Christianity from the time of Jesus to the reign of Theodosius.
Who was Christopher Columbus? In this video, Kim explores Columbus's background, his search for royal patronage, and his first voyage in 1492.
How homologous chromosomes exchange fragments in prophase I. Tetrads, chiasmata, and alleles.
Overview of DNA transcription, translation, and replication during mitosis and meiosis. Learn about chromosomes, chromatids, and chromatin.
Discussion of the relatively recent changes in our ability as a species to shine light on our deep past. Created by Sal Khan.
Adafruit founder Limor Fried and virtual reality designer Nat Brown show how simple logical circuits underlie everything your computer does.
Definition of circuit terms: element, component, node, branch, mesh, and loop . Created by Willy McAllister.
In a closed economy, goods and services are exchanged in product markets and factors of production are exchanged in factor markets. In this video, we explore how to model this in a straightforward way using the circular flow model. Created by Sal Khan.