Life’s been around on Earth for at least 3.7 billion years. But for most of that time, it was incredibly boring — just simple little cells squirming around in water. It only got interesting in the last few hundred million years. And that...

The Moon is typically 380,000-ish kilometers from the Earth, so it doesn't seem like they have that much of a direct influence on one another. However, the presence of hematite on the lunar surface suggests our planet is causing the Moon...

Oxygen levels in the Martian atmosphere are mysteriously inconsistent, and scientists don’t have a clear explanation for what’s behind the changes. Meanwhile, scientists DO have explanations for the tiger-like stripes on one of Saturn’s...

Mr. Andersen explains the difference between physical and chemical changes. A brief discussion of chemical reactions and equations is also included.

Today's Crash Course Chemistry takes a historical perspective on the creation of the science, which didn't really exist until a super-smart, super-wealthy Frenchman put the puzzle pieces together - Hank tells the story of how we...

Astronauts onboard the ISS get their breathable oxygen in two main ways - through systems onboard the ISS that generate breathable oxygen and through resupply missions that deliver breathable oxygen to the ISS. There is plenty of oxygen...

Astronauts onboard the ISS get their breathable oxygen in two main ways - through systems onboard the ISS that generate breathable oxygen and through resupply missions that deliver breathable oxygen to the ISS. There is plenty of oxygen...

This video provides an overview of the combustion of fuels, including what fuels are and their various uses, the differences between complete and incomplete combustion, and how to balance an equation for the combustion of a particular...

It describes various types of waste material in plants and their disposal.

This video discusses three different methods that can be used to determine the amount of oxygen in the atmosphere. The speaker explains the importance of oxygen and its role in respiration, burning fuels, and obtaining useful products...

Describe the components of light harvesting complexes in photosystem I and II and explain the events taking place during cyclic and non-cyclic photophosphorylation.

The video is a tutorial on how to balance chemical equations. The instructor goes through three different equations, counting the number of elements present on each side and then adjusting the coefficients to balance the equation. The...

This video is on moles and how to convert between grams and moles. The speaker explains what a mole is, its significance in measuring chemical amounts, and the use of Avogadro's constant in determining the number of atoms or molecules in...

The video discusses the history of the Earth's atmosphere and how it has changed over time. It explains the theories and evidence scientists have used to hypothesize these changes, from the early atmosphere being similar to that of Mars...

This video is an educational tutorial on the concepts of oxidation and reduction in chemistry. The presenter covers topics such as state symbols, ionization, and half equations. Using examples and demonstrations, the presenter explains...

This program provides an introduction to chemistry. We begin by discussing how chemistry touches every part of everyday life and give several examples of basic chemical reactions that students come into contact with regularly. The entire...

This program covers part 3 of the very important topic of the atomic theory of matter. We discuss how atoms combine together to form new compounds. Students review the law of conservation of mass and how the mass of the substances at the...

This video is a tutorial on balancing chemical equations. The presenter discusses the law of conservation of mass and the importance of balancing equations to determine the ratios of reactants and products. They explain the meaning of...

The video discusses the composition of air, specifically the gases nitrogen, oxygen, argon, and carbon dioxide. The presenter explains how these gases react with certain compounds and how they can be made from other substances. The video...

Through animation and video footage students will learn that there are two basic types of catalysts, heterogeneous and homogeneous. Students will come to understand that catalysts have many practical applications and that scientists use...

This lively video investigates the wide, colorful assortment of fish found on the planet. Concepts and terminology: saltwater, freshwater, cold-blooded, fins, backbone, eggs, scales, and gills.

This video discusses the various tests that chemists use to identify different gases like hydrogen, oxygen, carbon dioxide, chlorine, and ammonia. The presenter demonstrates each test using simple equipment like test tubes, splints, and...

Through animation and video footage students will learn that there are two basic types of catalysts, heterogeneous and homogeneous. Students will come to understand that catalysts have many practical applications and that scientists use...

This video defines what a chemical reaction is and explains how chemical reactions obey the law of conservation of matter. Students will see real world examples of chemical reactions and come to understand that no matter is created or...