Chemistry is the branch of the physical sciences, which is concerned with the study of matter, its composition, and its properties, particularly pertaining to the ways varying types interact with one another in the physical world. The smallest known unit of matter is called an atom, which contains a nucleus consisting of protons and neutrons, and orbiting electrons. The size of the nucleus determines the type of atom it is. An atom is named according to the number of protons contained in the nucleus, and all atoms with that "atomic number" are considered of the same type- or element. An atom with an atomic number of one has been given the name "hydrogen."

A periodic table of elements has been established that arranges elements according to their sizes, which happens to indicate physical properties of elements, as well. In fact, the periodic table was originally created before protons were discovered, classifying elements into "metals" and "non-metals." We still classify elements as such- with the addition of a "metalloid" category and more specific subdivisions within each.

Though atoms have been split in modern times, elements have long been considered the basic units of matter, held together by chemical bonds. Because electrons and protons hold opposite charges, they are drawn to each other and so different elements lend themselves to "covalent bonding," forming "molecules. For example, when two atoms of hydrogen and one atom of oxygen bond in such a manner, also known as H2O, water is formed. As molecules react to each other, whether by combining by sharing an electron between them, or by elements' recombining with one another when the magnetic attraction of the electron of one atom becomes more strongly attracted to the proton of another and the electron "jumps" to the orbit of another, their interactions are called "chemical reactions." Various branches of chemistry have been formed according to the types of reactions which are being studied. Biochemistry, for instance, is the study of chemical reactions within biological systems.

However, chemistry is not all about making experiments that unfortunately will end by blowing up your house as we see in the movie cliches. Before making experiments in the field of chemistry, every chemist or student must be familiar with at least the basic information regarding substances, tools and the equipment used when making these particular experiments because while some substances are harmless such as calcium, others like phosphorus or mercury can be really dangerous if not used properly. Besides the regular chemistry, there are other branches such as neuro-chemistry which deals with studying the nervous system.

Going back to the beginnings of the chemistry, it is known that the first time people had contact with this science was around 4 millenniums ago, when the Egyptians made the first experiments involving substances. The first processes based on their knowledge regarding chemistry were used in beer making or creating certain alloys. Throughout time, more and more substances have been discovered when it comes to chemistry, and this is why the periodic table (also called Mendeleev`s Tabel, after the name of its creator) is still being completed.

To sum up, tools like chemical scoops, calorimeters, funnels, droppers, conflagration spoons or the alcohol lamps are only a few of the pieces of equipment used in the chemistry laboratories, whether we talk about special chemistry laboratories with hi-tech equipment or a school lab. It is not easy to find and buy them online, and most web directories have a list of sites from where chemists can buy what they need.

Chemistry is the science of physical matter. This covers the study of matter itself, and also the study of changes it can undergo.

Chemistry has been important for a long time. In ancient Egypt, the properties of matter were understood and led to the possibility of innovations in controlling physical matter in the environment: metals could be extracted from ores, grains could be fermented into ale, and chemicals could be extracted from plants to make dye.

Chemistry starts from the foundation of the study of the atom the "building block" of all matter. The field expands to study complicated structures of matter and their functions, such as the relatively young subfield of neurochemistry in which the inner workings of the nervous system is explored through the study of neurochemicals and neuron function.

With so many types of physical matter than exist in the universe, chemistry has a large number of subfields that are studied. Classifications as broad as the division between organic or inorganic matter are broken down into countless subsets based on what properties are examined or why the matter is being studied.

With the study of chemistry, we are able to fully understand the reason our world works the way it does. With the study of matter, we can understand how physical entities are constructed and changed and use this information to manipulate and control our physical environment. With this type of control and understanding, we are able to create faster and more efficient technology or remedies and medicines for physical problems.

Using a web directory that catalogues resources from all aspects of chemistry, one can research about the properties of matter and its changes or keep up on the newest information about the growing field of chemistry, from new technologies in the field to new breakthroughs in study.

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