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Many of the chemical elements came to life only after long searches and experiments by chemists. One such popular element in modern technology is beryllium. "How so!?" - you will exclaim. Indeed, the main minerals of beryllium - emerald and beryl - have been accompanying man for many millennia in the form of precious stones for various ornaments...

Soap was known to man before the new era of chronology. The earliest written mention of soap in European countries is found in the Roman scientist Pliny the Elder (23-79 gg.), Who wrote about the ways of cooking soap with saponification of fats. Moreover, he wrote about a hard and soft soap, obtained using soda and potash, respectively...

There is a rule: the more active the metal, the more it oxidizes in the air, is corroded. Therefore, for example, sodium is stored under kerosene. But aluminum is much more active than iron, but iron quickly rusts, and aluminum and chrome in the air, no matter how much they hold, practically do not change. Why is this happening?..

How to determine the protein in front of us or not? You need to conduct quality reactions to protein, you will say, and you will be right. There are several such reactions. For biuret reactions, we need solutions of washing soda and copper sulfate. We prepare several solutions that contain protein, for example, meat and fish broth...

Many of the surrounding metal objects can be corroded. And this does not surprise anyone, because oxygen and water interact quite intensively with many metals. But, for example, some do it quickly and with the release of heat - practically explode - sodium, potassium, lithium. Magnesium also belongs to them. Let's look at interesting experiments with magnesium and try to figure out why this is possible...

Today the issue of ecology comes to the fore. But a healthy ecology is impossible without oxygen. It is he who is the main building block of life on the planet Earth. In addition, oxygen is often involved in many chemical reactions. Let's look at how to get oxygen in a chemical laboratory...