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Dünnschichtchromatographie
Chromatografische Verfahren sind physikalische / chemische Trenntechniken von Stoffen.
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Lerneinheit Chemie 8 – Kalk
In unserem Arbeitsheft „Lerneinheit Chemie 8 – Kalk“ finden Sie 10 interaktive und didaktisch aufbereitete Aufgaben zum Thema Kalk.
Wie Chemiker arbeiten
Chemie begegnet uns permanent im Alltag, beim Kochen, Putzen oder Backen.
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Basics of Chemistry II
When we take a closer look at substances, we discover that they consist of either one single element or of mixtures of several elements. Chemists therefore divide the world of substances into pure and mixed chemical substances. A pure substance is of homogeneous composition. Substance mixtures, however, consist of two or more pure substances. The many mixtures are subdivided not only into homogeneous and heterogeneous mixtures but depending on the respective aggregate states of their components, are classified into various groups of mixtures.
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Gummi
Heutzutage einen Industriezweig zu finden, der ohne Gummi auskommt, ist denkbar schwierig. In dieser Folge gehen Joey Grit Winkler und Fero Andersen der Frage nach: Was ist Gummi eigentlich und wie wird er hergestellt?
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Basics of Chemistry I
We are surrounded by objects and substances. We recognise objects that are to serve a specific purpose by their shapes. Similar objects may consist of different materials or substances. Substances, however, are independent of shapes and possess very specific properties. We are able to perceive many of these substances with our senses. For example, we can see, touch or smell them so as to be able to recognise them. Chemists are particularly interested in those substance characteristics that can be measured. On the basis of these measurable properties they can distinguish between substances, identify a specific substance or test it for special use. Models help us to understand phenomena. They depict only specific elements of our reality, thus presenting the world in a simplified way. The spherical particle model, for example, helps us to understand how a scent spreads all over the room or substances disperse in water.
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Produkte des Alltags
Gut verpackt ist halb verkauft. Je kreativer, bunter und ansprechender Produkte verpackt sind, desto besser lassen sie sich verkaufen. Laut aktuellen Studien trifft ein Käufer seine Entscheidung in nur 1,6 Sekunden. Und dabei lässt er sich meistens von Größe, Farbe, Design und dem Namen des Produkts leiten. Der Inhalt wird bei der Kaufentscheidung oft zur Nebensache. In dieser neuen Folge von "Schau Dich schlau!" erklären Joey Grit Winkler und Fero Andersen neben psychologisch präzise ausgefeilten Verkaufsstrategien auch die Herkunft der bekanntesten Markennamen. Psychologen haben herausgefunden: Sehen wir etwas Rotes, Gelbes oder Orangenes, bekommen wir automatisch Appetit. Fällt unser Blick auf etwas Grünes oder Blaues, denken wir an Sauberkeit und Frische. Von einem Experten wird Joey Grit Winkler in die Geheimnisse der Verpackungswelt eingeführt und lässt sich erklären, woher die bekanntesten Markennamen kommen. Währenddessen taucht Fero Andersen in die Materie ein und analysiert, ob in den Verpackungen auch immer das drin steckt, was drauf steht. Muss Schwarzwälder Schinken aus dem Schwarzwald stammen? Oder genügt es, wenn der Schinken lediglich im Schwarzwald geräuchert wurde, das Fleisch aber aus Dänemark stammt? "Schau Dich schlau!" klärt über diese und andere wichtige und interessante Verbraucherfragen auf.
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Aluminium II
The metal aluminium is growing in importance because of its specific properties and manifold application possibilities. This DVD deals with the industrial production of aluminium as a raw material, its processing and the manufacturing of alloys for the finished product. Starting with the raw material aluminium oxide the functioning of an electrolytic cell is demonstrated and explained. Alumina, white and powdery, is melted with great expenditure of energy, and by means of electrolysis converted into aluminium with a degree of purity of 99.9%. As aluminium oxide would not melt before a temperature of over 2,000°C is reached, the mineral cryolite is used as a solvent. The various alloys change the properties of aluminium and are produced according to precise formulations. The alloy is cast into blocks and bars that serve as primary material for processing plants. The responsible handling of resources underscores the importance of recycling. Aluminium is resilient and versatile.
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Aluminium I
In the modern world, we encounter aluminium at every turn. This is due to the particular properties of the metal. Increasingly, aluminium is about to edge iron and steel out of engineering, as aluminium allows energy-saving lightweight construction of aircraft and vehicles of all kind. Aluminium is weather-resistant, does not rust and is therefore well suited as building material for house facades, window frames or simply for all parts that are exposed to wind and weather. At the same time, aluminium has a noble-looking surface recommending it as material for interior design.
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MedienLB has been producing award-winning school films and interactive modules for the classroom since 2006.
Plastic
Plastic has been around for not longer than roughly 100 years, and the synthetic material is a brilliant invention. Its production is cheap, it can take almost any possible form, it is light-weight, versatile and, above all, inexpensive.
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C, CO2 and Associates in Everyday Life
All organic matter contains carbon. Coal is deposited in the Earth's interior. It developed about 300 million years ago from plants in a geological period which is also called Carboniferous. During the combustion of organic matter, carbon turns into the gas carbon dioxide. Dissolved in water, it becomes the so-called carbonic acid. Carbon dioxide is an incombustible, colourless and odourless gas that is easily dissolved in water. With various metal oxides or hydroxides it forms two types of salts: the carbonates and the hydrogen carbonates. As calcium carbonate it is contained in natural products such as chalk and egg shells. Specific forms of carbon, called modifications, are graphite and also the particularly valuable diamond.
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