• • • Chemistry is the involved with and composed of, and: their composition, structure, properties, behavior and the changes they undergo during a with other substances. In the scope of its subject, chemistry occupies an intermediate position between.

It is sometimes called because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant chemistry (), the formation of igneous rocks (), how atmospheric ozone is formed and how environmental pollutants are degraded (), the properties of the soil on the moon (), how medications work (), and how to collect DNA evidence at a crime scene (). Chemistry addresses topics such as how atoms and molecules interact via to form new. There are four types of chemical bonds: bonds, in which compounds share one or more electron(s);, in which a compound donates one or more to another compound to produce ( and );; and bonds. Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Etymology The word comes from alchemy, which referred to an earlier set of practices that encompassed elements of chemistry, metallurgy, philosophy, astrology, astronomy, mysticism and medicine.

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It is often seen as linked to the quest to turn lead or another common starting material into gold, though in ancient times the study encompassed many of the questions of modern chemistry being defined as the study of the composition of waters, movement, growth, embodying, disembodying, drawing the spirits from bodies and bonding the spirits within bodies by the early 4th century Greek-Egyptian alchemist. An alchemist was called a ' in popular speech, and later the suffix '-ry' was added to this to describe the art of the as 'chemistry'.

The modern word alchemy in turn is derived from the word al-kīmīā (الكیمیاء). In origin, the term is borrowed from the Greek χημία or χημεία. This may have origins since al-kīmīā is derived from the Greek χημία, which is in turn derived from the word, which is the ancient name of Egypt in the. Alternately, al-kīmīā may derive from χημεία, meaning 'cast together'.

Modern principles. Institute of Biochemistry, in. The current model of atomic structure is the. Traditional chemistry starts with the study of,,,, metals, and other aggregates of matter. This matter can be studied in solid, liquid, or gas, in isolation or in combination. The, reactions and transformations that are studied in chemistry are usually the result of interactions between atoms, leading to rearrangements of the chemical bonds which hold atoms together. Such behaviors are studied in a chemistry.

The chemistry laboratory stereotypically uses various forms of. However glassware is not central to chemistry, and a great deal of experimental (as well as applied/industrial) chemistry is done without it. Solutions of substances in reagent bottles, including and, illuminated in different colors A is a transformation of some substances into one or more different substances.

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The basis of such a chemical transformation is the rearrangement of electrons in the chemical bonds between atoms. It can be symbolically depicted through a, which usually involves atoms as subjects. The number of atoms on the left and the right in the equation for a chemical transformation is equal. (When the number of atoms on either side is unequal, the transformation is referred to as a or.) The type of chemical reactions a substance may undergo and the energy changes that may accompany it are constrained by certain basic rules, known as chemical laws. And considerations are invariably important in almost all chemical studies.