Explore the concepts of reversible and irreversible changes in matter, distinguishing between the types of transformations that can be undone and those that are permanent. This video clarifies how physical changes, like melting wax or...

It explains permanent, temporary, reversible and irreversible changes.

What chemical and physical changes are at play in cake baking.
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Material processes - Changing materials - More chem
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Learning Points
Chemica
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changes are usually...

Thermodynamic Reversibility

In this video Paul Andersen explains how the second law of thermodynamics applies to reversible and irreversible processes. In a reversible process the net change in entropy is zero. In and irreversible process the entropy will always...

Learn all about the states of matter - solid, liquid and gas. We explain the concepts of freezing, melting, evaporation, and condensation, and discuss the reversibility of physical changes. We also distinguish between physical and...

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...

From the Hindu festival of Dessehra to a kitchen in Chinatown, we bring you five demonstrations of non-reversible changes resulting in new materials, for use with students in the classroom. Non-reversible changes result in the formation...

What drives natural phenomena? Why does entropy only increase or stay the same. Why does a pencil on its tip fall to the table?

Things always tend towards their lowest energy state. Why is nature driven this...

Chemical equation shows the overall chemical change of reactants into products. It's a bit like a detailed cooking recipe, but where all the ingredients and all the products are written down, even the ones you can't necessarily see. The...

How does the indeterminate world of quantum mechanics, where the future isn’t fixed, become the classical predictable real world we experience? Quantum researchers argue about it even today. It's really all...

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...

Chemical equation shows the overall chemical change of reactants into products. It's a bit like a detailed cooking recipe, but where all the ingredients and all the products are written down, even the ones you can't necessarily see. The...

In quantum mechanics, it’s just as natural to go forward in time as going backwards. And if you look at a typical Feynman diagram, you can turn the diagram either way. Where does this transition from time symmetry...

It explains the transfer of heat from colder to warmer bodies, relation between entropy and spontaneity,Gibbs energy and spontaneity.

Find out what makes a mixture, and what happens when materials react chemically.
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Material processes - Separating mixtures - What


is a mixture? />

Learning Points
A mixture is formed when...

To change the shape of a protein or amino acid molecule, disrupting its normal biological activity, but without changing it chemically.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60...