Take a look at an organized physics course. The 34-section electronic textbook covers material in AP® Physics 1 and 2. Teachers use the text to supplement lectures and have the class work through the labs. Each section contains multiple...

Twelve fundamental particles exist in our universe, and they interact in exactly four ways. Does this mean we should be able to predict the future? We know entropy increases, but how does that impact us? These questions and more become...

Entropy, often misunderstood yet easily proven through mathematics, caused confusion for many years. A video explains entropy through simple models. It demonstrates the mathematical proof behind the phenomenon.

Only 10 percent of an incandescent bulb's energy is used to create light; the remaining 90 percent is heat. In the unit of activities, young chemists examine energy through hands-on activities, videos, discussions, and readings. Scholars...

Free energy, get your free energy here! Learners see that all organisms require free energy, which comes from the sun. The lesson explains the first two laws of thermodynamics and then analyzes metabolism, via glycolysis, on a very...

As to be expected from the American Chemical Society Olympiad Examinations Task Force, this 60-question test tops the charts in terms of excellence. It consists entirely of multiple choice questions designed to assess a year's worth of...

The National Chemistry Olympiad exams are comprehensive tests covering an entire  year of chemistry concepts. You can use them as practice for competing in the challenge, or simply as a review, or as an actual final exam for your general...

The 2009 version of the first part of a national chemistry competition is posted for your use with olympiad hopefuls. Test takers deal with 60 multiple choice questions covering an entire year of chemistry curriculum. Use this to...

This 60-question comprehensive exam was designed to determine who would go on to compete in the 2000 US National Chemistry Olympiad. Hopefuls answer multiple choice questions regarding all chemistry topics taught in the first year...

A beautifully designed, eighteen-page chemistry tutorial awaits your learners. The main topics: enthalpy and entropy. By completing this lesson, learners will be able to define these concepts, determine whether each is increasing or...

In this chemistry Olympiad worksheet, students solve sixty multiple choice questions on a variety of chemistry topics from finding molarity of solutions to calculating products of reactions. Students are given graphs, equations, reaction...

The University of the State of New York has designed a series of exams to be given to high schoolers. This chemistry exam is one of the most comprehensive and well-written that you will ever find. It consists of 84 questions in a variety...

Sal provides two definitions for entropy: the thermodynamic definition and the mathematical definition. Entropy and the 2nd Law of Thermodynamics are the focuses of this chemistry video. The law states that the change in entropy in the...

Entropy is the focus of this chemistry video. More specifically, Sal drives the point home that entropy is a macro state variable. This means that a change in the universe's entropy must always be positive, because when heat is added to...

In the previous video, Sal introduced students to entropy and the 2nd Law of Thermodynamics. An example he used had a couple of points that were factual, but not clear to many students. In this video, he goes over those points again in...

There are reasons elderly people are more susceptible to diseases. A video lesson instructor discusses the changes cells endure over someone's lifespan and how that affects the likelihood of contracting a disease.

CPT theory is the basis for much of physics, but what happens when researchers disprove the theory piece by piece? Explore the idea with a video about the Nobel Prize-winning breakthroughs that shifted the entire way scientists...

Scientists discovered the first law of thermodynamics 25 years after the second law of thermodynamics. The seemingly obvious discoveries sometimes confuse scientists while more complex challenges encourage extra study—and take more time...

Your car's engine is likely to be only 20 percent thermally efficient. Why so inefficient? Viewers of the 10th video in an engineering series learn how the second law of thermodynamics and entropy limit the efficiency of a car engine....

Just when you thought you had life figured out ... here comes another great video! Young biologists discover the multi-faceted meaning of life through a video from a comprehensive science playlist. Content includes when life appeared on...

Using the resource is probably the most efficient way to learn about efficiency. The 18th installment of a 25-part Energy Systems and Solutions unit has pupils investigate energy efficiency through discussions and associated activities....

It's all uphill from here! Scholars examine the pattern of random particle motion up a staircase. The simulation shows how the linear increase in energy corresponds to an exponential decrease in particle concentration.