Chemistry is a large field comprising many sub-disciplines that often overlap with significant portions of other sciences.
Chemistry typically is divided into several major sub-disciplines.
Quantum chemistry describes the behavior of matter at the molecular scale.
Modern physics shows that it is actually energy that is conserved, and that energy and mass are related; a concept which becomes important in nuclear chemistry.
Chemistry is the scientific study of the interaction of chemical substances, which comprise often multiple copies of and/or combinations of atoms composed of protons, electrons and neutrons.
Chemistry (from Egyptian k?me (chem), meaning "earth") is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions.
More central to chemistry is the interaction of matter with other matter such as in the classic chemical reaction where chemical bonds are broken and made, forming new molecules.
Hence a detailed understanding of quantum mechanics is not necessary for most chemistry, as the important implications of the theory (principally the orbital approximation) can be understood and applied in simpler terms.
neurochemistry, the study of the chemical dynamics of the brain.
Most chemists have a broad general knowledge of many areas of chemistry as well as one or two areas of specialization.
Chemistry works extensively with multiple variations on the basic pattern of beneficial interactions between complementary, oppositely-charged pairs of entities.
More modern laws of chemistry define the relationship between energy and transformations.
Chemistry can be called "the central science" because it connects the other natural sciences, such as astronomy, physics, material science, biology, and geology.
The most fundamental concept in chemistry is the law of conservation of mass, which states that there is no detectable change in the quantity of matter during an ordinary chemical reaction.
Chemistry is in some ways physics on a larger scale and in some ways it is biology or geology on a smaller scale.
Chemistry incorporates the concepts of energy and entropy in relation to the spontaneity of chemical processes.
Chemistry is somehow involved in almost every science, every technology and every "thing."
Chemistry is used to understand and make better materials for engineering.
Presented below are summaries and links to other articles that contain knowledge on a wide variety of sub-disciplines, techniques, theories, and tools used in chemistry.
Atoms are the fundamental units of chemistry as each of the chemical elements comprises one distinctive type of atom.
The defining feature of chemistry is that it involves matter in some way, which may include the interaction of matter with non-material phenomenon, such as energy for example.
Chemistry is a physical science related to studies of various atoms, molecules, crystals and other aggregates of matter whether in isolation or combination.
The genesis of chemistry can be traced to certain practices, known as alchemy that were practiced for several millennia in various parts of the world, particularly the Middle East.
Disciplines within chemistry are traditionally grouped by the type of matter being studied or the kind of study.
Historically, modern chemistry evolved out of alchemy following the chemical revolution (1773).
Chemistry is divided into many areas of study called sub-disciplines in which chemists specialize.
Example 1: Pure water is a compound made from two elements - hydrogen and oxygen. The ratio of hydrogen to oxygen in water is always 2:1. Each molecule of water contains two hydrogen atoms bonded to a single oxygen atom. Example 2: Pure table salt is a compound made from two elements - sodium and chlorine.
A chemical symbol designates an element that belongs to the periodic table. A chemical formula combines two or more symbols and it represents a chemical compound. We notice that the chemical symbols are followed oftenly by a subscript that represents the mole proprtions of next element.