Glow of solid bodies. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Glow of solids. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Barium bromate solution prepared in previous experience, cool to room temperature; white crystals of salt should precipitate. When there are enough of them, rub them with a glass rod. Maybe not the first time (requires skill), but when rubbed, flashes of light will appear.

For what reason - after all, chemical processes are no longer going on, and crystallization has also ended?

Indeed, the reason here is different - friction. And this phenomenon is triboluminescence (in Greek tribos - friction). There are substances that are very sensitive to friction and begin to glow in the dark not only when rubbed, but even when shaken. True, these substances are not the most common, but maybe they are in the school chemistry room or in the chemistry circle. Here are two of them: zinc sulfide ZnS with the addition of 0,02% manganese sulfide MnS; cadmium sulfide CdS. However, among the substances that emit light when rubbed, there are surprisingly ordinary ones. For example, sucrose.

In a large porcelain mortar, pour a little refined (i.e., refined) granulated sugar on the bottom. Enter a dark room and stay there for a few minutes. When your eyes get used to the darkness, at first slowly, then gradually speeding up the pace, rub the granulated sugar in a circular motion with a porcelain pestle. Soon, bluish sparks will appear, which will merge into a luminous ring. If you do not speed up the pace of rubbing, then sparks will flash under the pestle here and there.

A simplified version of the experiment: firmly hold a piece of refined sugar in your hand and strike it several times on a rough surface - faience, ceramic. Do this, as before, in the dark. If your eyes are used to it, you will see luminous stripes that go out as soon as they flare up.

Radiation during triboluminescence is explained by electric discharges that occur during the destruction of crystals. That is why it stops when the sugar crystals in the mortar are ground. Powdered sugar does not glow from friction.

Author: Olgin O.M.

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