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Vocabulary, food budget and logarithms
What do a writer's vocabulary and one's budget spent on food have to do with each other? Well, more than you might think! The mathematical relationship appears to be logarithmic.
Creating a mathematical model using regression analysis is …Translated by
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Crispr: Crash course
The gene editing technique CRISPR unleashed a true revolution in science. How exactly do genetic scissors work? Eos editor Kim Verhaeghe experienced this for himself during a crash course in Crispr in the lab of Joleen Masschelein at KU Leuven and …
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Climate change: Brochure
Czech brochure explaining how and why climate change education is important.
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Circular Economy: Infographic
This infographic is the principle diagram of the circular economy: the butterfly diagram.
It shows the different possibilities for circularity for biological (left half) and technical (right half) materials, in order of value retention for those …
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Qualitative determination of sulphites in wine
Almost every label on a bottle of wine states that the wine contains 'sulfites'. Sulphites are therefore a frequently used additive during the vinification process because many winegrowers are convinced that they are indispensable to …
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Flame tests with tea light holders
Metal salts dissolved in methanol color beautifully in the flame. These are very simple
experiments that can also be carried out by students under supervision.Translated by
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Between natural magic and science
Van Helmont is a seeker for the truth between magic and what we now call science, between alchemy and chemistry. Van Helmont's story is a source of inspiration for anyone interested in the evolution of thinking about the workings of nature.
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The critical micelle concentration of sodium dodecyl sulfate
The determinations of the critical micelle concentrations (cmc) for ionic surfactants using specific conductivity measurements are excellent research projects for students and pupils to gain insight into some properties of substances in solution. …
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Giving an extra dimension to classic equilibrium tests
Chemical equilibrium is a difficult topic theoretically. By studying the complexation reactions in an aqueous solution of a copper salt with hydrogen chloride and with ammonia, it can be made clear that there is a single reaction system.
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Experiment with copper nanoparticles to show color changes
In this contribution, we discuss a student project where copper nanoparticles were prepared by reducing copper (II) sulfate using sodium borohydride. The use of iodide ions provides the necessary stabilization of the nanoparticles formed. The …
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Atomic orbitals of hydrogen
Visualizing atomic orbitals of hydrogen using parametric equations.
Atomic orbitals are not a standard subject in secondary chemistry education in the Netherlands and Flanders. Teachers do pay attention to this subject. Simplified artistic …
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The discovery of argon and the importance of accurate data analysis
John William Strutt, third baron of Rayleigh (1842-1919), is one of the most impressive figures in the history of the natural sciences. He is best known for his explanation of the blue color in the sky caused by Rayleigh scattering. It is less …
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