Spectacular experiments in chemistry always draw special attention to themselves, remaining in memory for a long time, for example, a volcano on a table, a golden shower or instantly growing crystals. Not less effectively silvery hoarfrost, a "snow" snow-storm or a winter landscape which can be made even in a glass looks.
It is required to you
- - benzoic acid or naphthalene;
- - chemical glass on 500 ml;
- - heating device;
- - branch of a coniferous tree;
- - porcelain cup or flask.
Instruction
1. To receive a "snow" blizzard, it is necessary to stock up with benzoic acid which can be bought in pharmacy. Also as substitute it is admissible to use naphthalene, however, snowflakes will turn out slightly more largely and at the same time not such fluffy, and therefore in general and snow will be not so realistic, as with benzoic acid. Besides, the chemical glass from fire-resistant glass, the heating device (spirit-lamp or a torch) and also branches of coniferous trees is required.
2. Receiving a blizzard is based on ability of benzoic acid to sublimation (or sublimations) thanks to which there is a transition from a firm state to gaseous. When cooling couple of acid turn into the crystals imitating a snow snow-storm again.
3. Take a chemical glass (approximately on 500 ml) and fill in it crystals of benzoic acid (or naphthalene) weighing 5 g that they covered a bottom. Enclose there a branch of a pine or fir-tree which freely would be located in capacity. Close a glass a porcelain cup or a round-bottomed flask with cold water. For additional cooling it is possible to put ice cubes in water. Such improvised fridge will promote condensation of vapors of benzoic acid and formation of crystals in the form of white flakes of "snow".
4. Carefully heat a glass bottom by means of a torch or a spirit-lamp. Crystals at first melt, passing into a vaporous state, and then at once are condensed, forming fluffy "snowflakes" which are visually similar to the real snow. In a glass the real snow snow-storm is observed therefore white flakes cover a coniferous branch, reminding a winter landscape.