4/9/2023 0 Comments Atom definition chemistryMolecules are typically a set of atoms bound together by covalent bonds, such that the structure is electrically neutral and all valence electrons are paired with other electrons either in bonds or in lone pairs. However, this definition only works well for substances that are composed of molecules, which is not true of many substances (see below). Several concepts are essential for the study of chemistry some of them are: MatterĪ ball-and-stick representation of the caffeine molecule (C 8H 10N 4O 2).Ī molecule is the smallest indivisible portion of a pure chemical substance that has its unique set of chemical properties, that is, its potential to undergo a certain set of chemical reactions with other substances. Most chemists specialize in one or more sub-disciplines. Scientists engaged in chemical research are known as chemists. They can be analyzed using the tools of chemical analysis, e.g. Chemical substances are classified in terms of their structure, phase, as well as their chemical compositions. (When the number of atoms on either side is unequal, the transformation is referred to as a nuclear reaction or radioactive decay.) 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.Įnergy and entropy considerations are invariably important in almost all chemical studies. The number of atoms on the left and the right in the equation for a chemical transformation is equal. It can be symbolically depicted through a chemical equation, which usually involves atoms as subjects. The basis of such a chemical transformation is the rearrangement of electrons in the chemical bonds between atoms. Solutions of substances in reagent bottles, including ammonium hydroxide and nitric acid, illuminated in different colorsĪ chemical reaction is a transformation of some substances into one or more different substances. Alternately, al-kīmīā may derive from χημεία 'cast together'. This may have Egyptian origins since al-kīmīā is derived from the Ancient Greek χημία, which is in turn derived from the word Kemet, which is the ancient name of Egypt in the Egyptian language. The modern word alchemy in turn is derived from the Arabic word al-kīmīā ( الكیمیاء). Alchemy is often seen as linked to the quest to turn lead or other base metals into gold, though alchemists were also interested in many of the questions of modern chemistry. The word chemistry comes from a modification during the Renaissance of the word alchemy, which referred to an earlier set of practices that encompassed elements of chemistry, metallurgy, philosophy, astrology, astronomy, mysticism and medicine.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |