In this video Paul Andersen explains how energy can enter and leave a system. The amount of energy a substance can receive through heating or lose through cooling is measured using the specific heat capacity. Phase changing energy from...

Can we do stoichiometry regarding phase changes? Sure! If we know how many moles of a substance we have, and the energy associated with each mole of that substance undergoing a particular phase change, we can get the energy associated...

In this video, I explain how to use Gibbs phase rule in relation to phase diagrams; also, I work 5 examples of Gibbs phase rule.

Learn about reversible reactions. Find out where you can find them and what they actually are. In this lesson, we will learn about reversible reactions. When we fry an egg, it is impossible to 'unfry' it. A lot of reactions work in the...

Learn about reversible reactions. Find out where you can find them and what they actually are. In this lesson, we will learn about reversible reactions. When we fry an egg, it is impossible to 'unfry' it. A lot of reactions work in the...

In this video Paul Andersen explains that entropy is simply the dispersion of matter or energy. He begins with a series of video that show the natural direction of processes. According to the second law of thermodynamics the entropy...

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Crystal Palace poetically exemplified the goals of the industrial revolution in England. Here we discuss the cultural impact of the impressive structure.

The world's major economies are growing in concert for the first time in years. Interest rates are rising. After a sustained rise over many years, stock markets suffered a rare bout of volatility in February. What's next?

Here is one example in which we calculate enthalpy of reaction (ΔH_rxn).

What's the difference between a physical change and a chemical change? What are elements, compounds, pure substances, and mixtures? So many definitions to learn! Don't worry, Professor Dave will take you through the details.

In 2016, the first synthetic organism of original design was created. When you hear this statement, what does it make you think of? The word synthetic does imply that something was built by man. But if you're imagining artificial...

Polo is a historic and prestigious team sport that dates back over 2000 years, originally played by royalty and nobility. The game involves players on horseback using mallets to hit a ball, aiming to score goals in periods known as...

In this video Paul Andersen explains how metallic solids form when delocalized electrons hold the positive nuclei in an electron sea. This model helps to explain the properties of metals like conductivity, shiny appearance,...

Most people know the advice about never putting water on an oil fire. We joined Dr Peter Wothers on the roof of the Ri building in London to show exactly why. Above the famous Lecture Theatre, the team set up a clear protective shield...

Practice REAL problems from actual past IIT/JEE exams with Professor Dave!

Learn about dynamic equilibrium, the conditions required for dynamic equilibrium to be reached and examples of systems at equilibrium.

Solute particles interfere with the physical processes a solution may undergo. These are known as the colligative processes of a solution. Ever wonder why we put salt on icy streets? Find out here!