Popular Science Website

Everyone knows that water is a chemical compound, and its chemical formula - H₂O - is well known to everyone. Water consists of two elements - hydrogen and oxygen. Let's experiment with it, namely, try to decompose the water into its constituent parts and then create it again. This is not an easy task because water is a very stable compound...

Let's work with gases. Experiments with gases are somewhat more difficult to do than with liquids. Therefore, first of all, we will need plugs with holes and gas pipes. Slide a rubber or polyethylene flexible tube 30 centimeters long over the glass tube, and insert a short glass tube into the other end...

What is stearin and how to make a stearin candle from soap? To answer these questions, let's remember why soap washes. For this, its molecules have a special structure: a "head" and a long "tail", and the "head" tends to water, and the "tail", on the contrary, repels from the water... The hydrophobic tail is long hydrocarbon chains. One of them - the so-called stearin - can be obtained by taking laundry soap as a basis...

In experiments that are so similar to tricks, colorless solutions were painted in one or another color, and this happened immediately, as if by magic. Indeed, chemical reactions proceed very quickly and, as a rule, begin immediately after mixing the reagents. However, there are exceptions to this rule. The reaction mixture may remain colorless for a while, and then instantly turn color. Want - in five seconds, want - in ten; you yourself can set the "chemical clock" to the required time...

Silver nitrate solution is often used to determine hydrochloric acid or chlorides. Since silver nitrate is not easy to obtain, we can obtain a small amount by dissolving a piece of an old silver object (a silver coin, a piece of a spoon, jewelry, or chain). Silver objects, however, are not made of pure metal, but of alloys, which often contain copper as a second component. It gives the metal greater...

In recent decades, man-made fibers have literally taken over the world. And although cotton and flax are still sown, sheep and goats are raised, artificial fiber is added to traditional natural fibers to give strength, elegance, and other useful properties. How to get artificial fiber in conditions close to home?..