DTU Science Show visits BG
On Thursday, January 9, BG was visited by the DTU Science Show in connection with the students' study choice on January 20.
The demonstration experiments that the three DTU students chose to show spanned both chemistry and physics. One example is an experiment in which the air was ionized by a Tesla coil with a voltage of 30,000 V, which created beautiful "lightning" over the coil.
Many of the chemistry experiments illustrated aspects of the part of chemistry that deals with redox reactions - what we experience, for example, when a bicycle rusts or when the body converts sugar into energy. In several cases, these experiments gave rise to visible color changes in aqueous solutions of chemical substances.
When gas is formed in chemical reactions, this is accompanied by a large increase in pressure. This was demonstrated by putting dry ice (solid CO2) in a plastic cola bottle and placing it in a large plastic barrel. The result was a very loud bang.
Liquid nitrogen has a temperature of around -200℃ and boils on contact with a hot surface such as a hand. If hot water is poured into a barrel of liquid nitrogen, a violent reaction occurs.
If an aqueous solution of potassium permanganate is mixed with hydrogen peroxide and a little washing-up liquid, a huge “foam sausage” can be made.
