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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 discovery of atoms of electricity
The history of the discovery of the electron goes back to the search for the
properties of amber. Several scientists contributed to the creation of a scientific climate in which it became possible to discover the electron. This scientific history can …Translated by
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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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The first female Flemish chemical engineer: Marie-Louise Compernolle 1/2
After her studies, Marie-Louise continued to work as an assistant for four years. The first year with Professor Van de Velde, where she specialized in commodity knowledge, which she loved to do very much. At that time there was a general policy of …
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Greenhouse Effect: PhET Simulation
In the simulation of PhET Colorado, a number of questions are asked about the amplification and the natural greenhouse effect.
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Synthesis of gold colloids from honey
Gold colloid synthesis is a colorful nanochemical experiment. In this
contribution we discuss a student project where gold colloids are prepared from
a gold (III) salt using honey. The experiment is simple in execution.Translated by
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Determine the critical micelle concentration
Surfactants tend to form micelles in solution. The critical
micelle concentration is an important parameter for describing stability
of micelles. In this article we describe a relatively simple experiment through which
conductivity measurements the …Translated by
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STEMOOV: Vision on STEM
Given the importance of STEM in education and the current transition of teacher training, the Association University - Limburg University of Applied Sciences (AUHL) thought it desirable to arrive at a common vision on STEM for the teacher …
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