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Es wird erklärt, was ein Impfdurchbruch ist. Der Film beschreibt die vier Gründe für die steigenden Zahlen: Inzwischen sind viele Leute geimpft, die Fallzahlen steigen wegen schwindender Maßnahmen, die Delta-Variante ist ansteckender und die Zahl der Antikörper sinkt, wobei schwere Verläufe aber selten sind.
We see crystals everywhere in nature. They fascinate us with their shape and repetition - but how are they formed? This video looks at the various types of crystals, shows their formation in experiments and explains important terms and concepts such as the crystal lattice, quasi crystals and the law of constant angles.
With fossil fuels dwindling, finding alternatives to them becomes increasingly important. One way to meet our energy needs without oil and gas is solar power. This film explains how sunlight can be converted into useable energy, what problems there still are with solar power, and takes looks at the history of its discovery.
Ebola und Corona haben unterschiedliche Eigenschaften: Ebola ist tödlicher, Corona ansteckender. Westafrika, wo der Ebola-Ausbruch 2014 stattfand, war weniger international vernetzt als der Verkehrsknotenpunkt Wuhan. Und schließlich war es politisches Unvermögen, das die Verbreitung von Corona begünstigte.
Michael war immer aktiv und fit, bis er an ALS erkrankte - einer irreversiblen Form von Muskelschwund, die dazu führt, dass er inzwischen auf die Pflege durch seine Frau angewiesen ist. Zwei Reporter leben sieben Tage mit dem Paar und lernen, dass das Leben auch für einen Pflegefall lebenswert ist.
The six alkaline earth metals - beryllium, magnesium, calcium, strontium, barium, and radium - rank among the most reactive elements, coming in second after alkaline metals. They don´t occur in their elemental state. This video shows the properties and reactions of alkaline earth metals in different experiments.
Copper is one of the metals humans have been using the longest. In nature, it can be found in its pure form as nuggets, and humans began using it 10,000 years ago. Copper can be worked easily when smelted and cast. Using various experiments, this film demonstrates copper´s properties and its reactions with other substances.
Carbon can form multiple bonds with itself and other substances, making it one of the most versatile elements. This becomes particularly apparent in organic carbon compounds. Examples include the carbohydrate group but also petroleum, natural gas and coal, which are made up of the remains of plants and animals.
This film is about the organic compounds we call alcohols. Alcohol is not a human invention - it occurs naturally wherever yeast spores find the right conditions to reproduce. The video shows the molecular structure of alcohols, the differences between them, explains their properties and uses and looks at their production.
With a density of only around 2.7 g/cm^3, aluminium is one of the lightest metals. It is the third most abundant element in Earth's crust, is very soft, has a low melting point and excellent conductivity, making it one of the most versatile materials used in construction, packaging, and electrical engineering.
Endothermic reactions consume more energy than they release, whereas the opposite is true for exothermic reactions. Therefore, there are many applications for the latter. The film presents various forms of exothermic reaction and shows how, for example, combustion, thermite reactions and explosions can be used beneficially.
The first group of the periodic table consists of hydrogen and the six alkali metals lithium, sodium, potassium, rubidium, caesium, and francium. With only one electron in their outer shell, alkali metals are very reactive. This film explains some of the most important properties of the alkali metals.
As an alternative to petroleum, the possibilities of biomass are now being explored. The film presents biomass gasification and energy generation from biomass, explains how they work and names the advantages, but also the disadvantages of the new processes, which have not been sufficiently researched for a long time.
The air we breathe consists of nitrogen, oxygen, very little carbon dioxide and numerous other substances. The film explains what its composition is and how people have explored it over time. Another topic of the video are the five different layers that make up the vital atmosphere around the earth.
The global carbon cycle - the process by which carbon gets moved around between Earth´s atmosphere and biosphere - can be divided up into a geological and a biological carbon cycle. This video explains both of them and gives insight into the risks to Earth´s equilibrium brought on by burning fossil fuels.
Dass die Anzahl der Betten auf einer Intensivstation nicht das einzige Kriterium für die Überlastung ist, erklärt dieser Film: Covid-Patienten sind betreuungsintensiver als andere. Der Druck auf die Pfleger ist lange schon hoch, viele Stellen sind unbesetzt und es gibt nicht genug ausgebildete Fachkräfte.
Nach der Pandemie kommt die Endemie - das heißt, dass das Virus heimisch und ähnlich wie die Grippe relativ stabile Infektionszahlen verursachen wird. Ein Übergang mit Maßnahmen könnte Systemausfälle verhindern. Ein Übergang ohne Maßnahmen ginge wahrscheinlich schneller, würde aber mehr Leben kosten.
Die Zahl der psychischen Erkrankungen und Notfälle ist durch die Pandemie stark angestiegen. Das liegt an den multiplen Stressoren, denen wir durch die lang anhaltende Ausnahmesituation ausgesetzt sind. Für Angsterkrankungen, Essstörungen und Suchterkrankungen wirken die Corona-Maßnahmen als Katalysator.
Materials that by their mere presence can enable or speed up reactions that would either not even happen at all or take much longer to run without them are called catalysts. Catalysts are not involved in those reactions and come out untouched. They lower the activation energy and therefore speed up the reaction rate.
Chemical equilibriums occur when reversible reactions take place in a closed system. Most chemical reactions are not only unidirectional, but are rather reversible. Chemical and dynamic equilibrium are demonstrated with various experiments. The equilibrium constant is explained and the law of mass action described.
The substances dealt with in chemistry almost never occur in pure form naturally. Even substances that we consider to be "pure" contain admixtures of other substances. Topics of this film are the different mixtures of solid, liquid and gaseous substances and their different types of heterogeneous and homogeneous mixtures.
Chemical reactions take different forms: It pops or bubbles, but sometimes a reaction is barely visible. The film shows the common features of chemical reactions: Starting material and product, exothermic and endothermic reactions as well as the most important influencing variables of chemical reactions.
Electroplating, colloquially known as galvanising, is the electrochemical deposition of metal layers on so-called substrates - for example, coating a piece of metal with a usually very thin layer of a more noble metal. The process is named after the man who discovered it, the Italian doctor Luigi Galvani.
In neutralization reactions, the pH values of acids and bases cancel each other out. The film shows this using the reaction of hydrochloric acid and caustic soda as an example. The products are described, the titration procedure and the use of neutralization reactions in everyday life are demonstrated.
Exothermic chemical reactions give off more energy than they themselves need for their process. The film explains combustion, which is the most important exothermic reaction - we use it to produce heat for example. It is the most commonly used chemical reaction, and it is also the oldest one known to mankind.
Titration is used for the exact measurement of amounts and is a part of quantitative analytical chemistry. The most important instrument in titration is the burette, a glass tube with a scale. With its help, the concentration of a sample solution can be determined by adding a precise amount of a known standard solution.
This film is about the separation methods that can be used to split mixtures into their different components. It explains the separation methods decantation, sedimentation, sink-float separation, centrifugation, picking, filtration, evaporation, distillation, adsorption, extraction, chromatography, and combinations thereof.
Silver is considered to be the second most precious metal after gold. Silver is a brilliant white precious metal and with a density of 10.4 g/cm³, it is one of the heavy metals. Of all metals, it is the most reflective and absorbent of light. The film presents the properties of silver and how it reacts with other substances.
The simplest compounds in organic chemistry are the hydrocarbons. The film introduces the first alkanes (saturated hydrocarbons) and alkenes (unsaturated hydrocarbons) and explains their differences and properties. The substances can occur in many variants, which have correspondingly different properties.
We encounter sodium in various forms in many places in everyday life, including the kitchen. The film introduces sodium and sodium hydroxide, points out their differences, and demonstrates their material properties by means of experiments. The very different uses of the reactive element are also shown.