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Encyclopedia > Chemical

A chemical substance is any Matter is anything that has mass and occupies space. One [contemporary] view on matter takes it as all scientifically observable entities whatsoever. Matter can more accurately be defined as the energy that has a low vibratory rate, a compressed energy state. Commonly, the definition is limited to such entities explored... material substance used in or obtained by a process in -1... chemistry:

  • A A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition. For example, dihydrogen monoxide (water, H2O) is a compound composed of two hydrogen atoms for every oxygen atom. In general, this fixed ratio must be fixed due to some sort... chemical compound is a substance consisting of two or more A chemical element, often called simply element, is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom, which consists of electrons centered around a nucleus of protons and neutrons. The atomic number of an... chemical elements that are chemically combined in fixed proportions.
  • A A chemical element, often called simply element, is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom, which consists of electrons centered around a nucleus of protons and neutrons. The atomic number of an... chemical element is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an Atom Helium atom (not to scale) Showing nucleus with two protons (red) and two neutrons (green) and with a probability cloud (gray) of two electrons (yellow). Classification Smallest division of a chemical element Properties Mass: atomic mass Electric Charge: 0 C Diameter: 10pm to 100pm For alternative meanings see atom... atom, which consists of Electron The first few hydrogen atom electron orbitals shown as cross-sections with color-coded probability density Classification Elementary particle Fermion Lepton First Generation Electron Properties Mass: 9.11 × 10−31 kg 1⁄1836 amu Electric Charge: −1.6 × 10−19C Spin... electrons centered around a Plural: nuclei In chemistry and physics, the nucleus (atomic nucleus) is the collection of protons and neutrons in the center of an atom that carries the bulk of the atoms mass and positive charge. In cell biology, the nucleus (cell nucleus) is the membrane-bound subcellular organelle found in... nucleus of For alternative meanings see proton (disambiguation). Proton Classification Subatomic particle Fermion Hadron Baryon Nucleon Proton Properties Mass: 938 MeV/c2 Electric Charge: 1.6 × 10−19 C Spin: 1/2 Quark Composition: 1 Down, 2 Up In physics, the proton (Greek proton = first) is a subatomic particle with a... protons and Neutron Classification Subatomic particle Fermion Hadron Baryon Nucleon Neutron Properties Mass: 940 MeV/c² Electric charge: 0 C Spin: ½ Quark composition: 2 Down, 1 Up In physics, the neutron is a subatomic particle with no net electric charge and a mass of 940 MeV/c² (1.6749 × 10-27 kg... neutrons.
  • A In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. A molecule consists of multiple atoms joined by shared pairs of electrons in a covalent bond. It may consist of atoms of the same chemical element, as with oxygen... molecule is the smallest particle of an element or compound that retains the characteristics of the element or compound.
  • An This article is about the electrically charged molecule. For other uses of this word, see ion (disambiguation). An ion is an atom or group of atoms with a net electric charge. A negatively charged ion, which has gained one or more electrons, is known as an anion, for it is... ion is an Atom Helium atom (not to scale) Showing nucleus with two protons (red) and two neutrons (green) and with a probability cloud (gray) of two electrons (yellow). Classification Smallest division of a chemical element Properties Mass: atomic mass Electric Charge: 0 C Diameter: 10pm to 100pm For alternative meanings see atom... atom or group of atoms with a net electric charge, having lost (cation) or gained (anion) an Electron The first few hydrogen atom electron orbitals shown as cross-sections with color-coded probability density Classification Elementary particle Fermion Lepton First Generation Electron Properties Mass: 9.11 × 10−31 kg 1⁄1836 amu Electric Charge: −1.6 × 10−19C Spin... electron.

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FEMA: Household Chemical Emergency (191 words)
Although the risk of a chemical accident is slight, knowing how to handle these products and how to react during an emergency can reduce the risk of injury.
Once you have located a product, check the label and take the necessary steps to ensure that you are using, storing, and disposing of the material according to the manufacturer’s directions.
It is critical to store household chemicals in places where children cannot access them.
Chemical Weapons Information - Federation of American Scientists (2265 words)
Chemical weapons use the toxic properties of chemical substances rather than their explosive properties to produce physical or physiological effects on an enemy.
Although instances of what might be styled as chemical weapons date to antiquity, much of the lore of chemical weapons as viewed today has its origins in World War I. During that conflict "gas" (actually an aerosol or vapor) was used effectively on numerous occasions by both sides to alter the outcome of battles.
Chemical weapons were never deliberately employed by the Allies or the Axis during World War II, despite the accumulation of enormous stockpiles by both sides.
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