Popular Science Website

Chlorine is a stronger oxidizer than oxygen. Therefore, oxidation with chlorine is often used in various kinds of experiments. With chlorine, metals such as gold and platinum are directly connected, forming compounds AuCl₃ and PtCl₄. Chlorine is very active - it directly combines with almost all elements of the periodic system...

Experience with nitric acid. In a porcelain cup, fill with dry sawdust, heat them on fire. In a glass, preheat 2-3 ml of nitric acid with a density of 1,5 and pour it on hot sawdust. Sawdust are engaged. An experiment with nitric acid can also be carried out in this way. In the cup we put dry finely chopped straw, heat it as in the first case, and pour 2-3 ml with hot nitric acid. Straw is engaged...

An experience. Approximately the same amounts of sodium peroxide Na₂O₂ and sawdust are mixed on the asbestos cardboard or metal plate. This mixture is given the shape of a branch, its apex is pressed with a finger and a drop of water is pipetted into the pit. The mixture flashes and burns. First, the water reacts...

Probably, there is not such a schoolboy who would not have read with enthusiasm the remarkable fairy tale of I.Ya. Franco "The painted fox". It turns out that the fox can be repainted without paint. An experience. On a thick white paper, draw a fox and cut out the drawing with scissors. In a beaker, a saturated solution of K₂Cr₂O₇ in diluted...

In a liter flask, prepare a saturated solution of potassium nitrate in hot water. Before demonstration, heat this solution. We will demonstrate a transparent hot solution of potassium nitrate. We lower the flask with the solution in the snow. After a few minutes, we demonstrate the loss of crystals in the form of large needles of potassium nitrate...

We measure the temperature of the water with a thermometer. Prepare solutions for reducing temperature: 1) from 120 g of ammonium nitrate in 200 ml of water and 2) with 60 g of ammonium chloride in 200 ml of water in glass beakers. We lower in thermometers to reduce temperature thermometers and thermoscopes, which will show a sharp drop in temperature. Let us immerse the test tubes with 1-2 ml of water...