What exactly is chemistry ?!

A visit came to the lab today to actually see what chemistry is, that chemistry is not just in medicines, soaps, shampoos, but all around us. Chemistry is divided into several units: Analytical Chemistry, Inorganic Chemistry, Organic Chemistry, Physical Chemistry, Biochemistry, Theoretical Chemistry. Some of the basic concepts in chemistry are: Atom, Molecule, Mol, Element, Compound, Mixture, Substance, Chemical Bonds, Joni, Chemical Reaction, Energy.
An atom is the smallest part of a substance, A molecule is the smallest unit of a chemical compound, Mol is one of seven SI units for a quantity of a substance, A chemical element is characterized by a certain number of protons in the nucleus of its atoms, A chemical compound is a pure substance consisting of two or more elements , Mixtures are sets of two or more different substances, A substance is a form of existence of matter accessible to the human senses, A chemical bond is an attractive force between two atoms, Jon is a charged particle, Chemical reactions are permanent s in the structure of the starting materials, the reaction was Enegrija in which increased or wasting energy.

The very origin of chemistry is the emergence of the phenomenon of metallurgy, it is a craft of how to extract metal from ores. At that time, people did not know how only fire has the power to get from one form to another (such as melting, burning, heating water, ...), while also producing light and heat. No one could discover the secret then.

The chemistry as we know it today first appears in Europe because of the various diseases that caused people to die.

That is why even then, drugs appeared (this was around the early Middle Ages).

When all the chemical elements were discovered at the time of alchemy. All this culminated when Dmitry Mendeleev created a periodic system and later discovered a number of other synthetic elements.

One of the most important inventions was in the 20th century, when scientists made artificial fertilizer using nitrogen. The diet of 40% of the world's population is estimated to depend on artificial fertilizers based on ammonia synthesis. While other great discoveries were related to human genetics.

In the pictures we can see some very interesting and simple experiments ...