Chemistry
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Acids and Bases
In Everyday Products
We can find acids and bases in every supermarket, some of them in our food, others in cleaning agents. In everyday products, acids and bases as well as acidic and alkaline reacting salts have extremely different functions. In food, acids are either present or added as flavouring agents such as citric acid, tartaric acid and acetic acid, as antioxidants such as ascorbic acid or generally as acidifiers, sequestrants (citric acid and tartaric acid) and preservatives (acetic acid). In baking powder acidic salts (phosphates or tartar) react with soda as a raising agent – by means of a chemical reaction, carbon dioxide is formed as a gas. The film shows where we find acids and bases in our everyday life and what functions they have. The acid-base theory of the physico-chemist Arrhenius is explained just as Brønsted’s definition. Simple and interesting experiments encourage the pupils to perform their own tests. The comprehensive accompanying material includes information for further or in-depth discussion of the subject of acids and bases at school. The DVD was compiled in cooperation with the well-known professor of chemistry Georg Schwedt.
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Curriculum-centred and oriented towards educational standards
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Today, the use of new media has become a matter of course not only in everyday life – schools and teaching, too, benefit from the new technologies and methods, which support active and independent learning. Especially in computer science, ethics and language courses but also in all other subjects, modern media are a valuable pedagogic and didactic asset. This DVD uses the example of podcasts to demonstrate how the possibilities opened up by new media can be applied in the classroom and how the pupils can be taught to handle them in a competent and target-oriented manner. The film is aimed at supporting the use of podcasts at school and encourages making them. This also requires the ability to find information on the Internet and assess it. The film informs on the functionality of podcasts and technical background as well as on the teaching and learning possibilities offered by podcasts – ranging from specific contents to superordinate learning targets such as the advancement of creativity and team spirit. The DVD is a useful support for teachers applying new media and wishing to show their pupils how to handle Running Time: 20:29 ms them in a sensible way.
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