define phase chemistry
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What does phase mean in chemistry? A phase, or state of matter, is a domain within a many-body system within which relevant physical properties are uniform. Relevant properties may include chemical composition, stoichiometry, and density, which do not reflect how the components are arranged in space.
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Phase (matter) Because phase boundaries relate to changes in the organization of matter, such as a change from liquid to solid or a more subtle change from one crystal structure to another, this latter usage is similar to the use of phase as a synonym for state of matter.
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form dispersing phase. Thesaurus. Definitions of dispersing phase. 1. n (of colloids) a substance in which another is colloidally dispersed. (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary. Word Family.
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phase Phase(noun) a particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form of enlightened disk; as, the phases of the moon or planets.
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Water chemistry FAQ Frequently Asked Questions The changes from a liquid to a solid or to a gas are called phase changes. When a substance such as water changes phase, its physical appearance changes, but not its chemical properties. This is because the chemical structure remains the same, but the molecules of which it consists will float a little further apart.
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phase rule A rule used in thermodynamics stating that the number of degrees of freedom in a physical system at equilibrium is equal to the number of chemical components in the system minus the number of phases plus the constant 2. Also called Gibbs phase rule.
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phase in Biology A characteristic form, appearance, or stage of development that occurs in a cycle or that distinguishes some individuals of a group: the white color phase of a weasel; the swarming phase of locusts. tr.v. phased, phas·ing, phas·es. 1. To plan or carry out systematically by phases.
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Molecular Orbital Theory The phase of an orbital is a direct consequence of the wave-like properties of electrons. In graphical representations of orbitals, orbital phase is depicted either by a plus or minus sign (which have no relationship to electric charge) or by shading one lobe.
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phase States of matter such as solid and liquid are examples of phases, as are different crystal lattice structures in metals such as iron. See also phase transition, state of matter. A measure of how far some cyclic behavior, such as wave motion, has proceeded through its cycle, measured in degrees or radians.
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What Is a Phase Change in Science? Quick Answer. A phase change in science refers to any substance that changes from one state to another, with possible states being gas, liquid and solid. Substances typically phase change to the closest related state, such as liquid to solid, but in certain conditions can go from gas to solid or solid to gas. Continue Reading.
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phase Definition of phase for English Language Learners. : a part or step in a process : one part in a series of related events or actions. : a short period of time during which a person behaves in a particular way or likes a particular thing.
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solution 1 The solvent is the component whose phase is retained when the solution forms; if all components are the same phase, the one in the greatest amount is the solvent. Other components are called solutes. The process of a solute dissolving in a solvent is called dissolution. We must specify the temperature of dissolution because temperature effects the extent of dissolution. Dissolution also depends on the nature of the solute and solvent.
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phase In electronic signaling, phase is a definition of the position of a point in time (instant) on a waveform cycle. A complete cycle is defined as 360 degrees of phase as shown in Illustration A below. Phase can also be an expression of relative displacement between or among waves having the same frequency .
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- Phase space refers to the vector space spanned by combinations of the velocity and position coordinates of a system. In N-body systems, where each body is assumed to be a simple point element, the phase space contains each element's position and momentum/velocity information.
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chemistry n, pl -tries. 1. (Chemistry) the branch of physical science concerned with the composition, properties, and reactions of substances. See also inorganic chemistry, organic chemistry, physical chemistry. 2. (Chemistry) the composition, properties, and reactions of a particular substance.
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Herbs Many culinary herbs grown in Minnesota are members of two plant families. The mint family, Lamiaceae, includes basil, oregano, marjoram, catnip, all the mints, as well as rosemary, thyme, lavender, summer savory, and sage, are all grown for their aromatic leaves.
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Definition of Mobile phase Definition of Mobile phase. The solvent that moves the solute through the column. In analytical and organic chemistry, elution is the process of extracting one material from another by washing with a solvent; as in washing of loaded ion-exchange resins to remove captured ions.
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moving phase moving phase, n in chromatography, the gas that carries the vapors from the investigated sample all the way through the column of the gas-liquid chromatograph. Also called. mobile phase.
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binocular microscope phase microscope (phase-contrast microscope) a microscope that alters the phase relationships of the light passing through and that passing around the object, the contrast permitting visualization of the object without the necessity for staining or other special preparation.
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phase Phase difference, also called phase angle, in degrees is conventionally defined as a number greater than -180, and less than or equal to +180. Leading phase refers to a wave that occurs ahead of another wave of the same frequency. Lagging phase refers to a wave that occurs behind another wave of the same frequency.
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What is a phase of a wave and a phase difference? Basically phase is an angle of line joining the origin and the any point on the wave with $x$ axis of our reference frame and the word phase is defined for the single wave function. But the phase difference is defined for two waves.
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Melting Melting is therefore classified as a first-order phase transtion. Melting occurs when the Gibbs free energy of the liquid becomes lower than the solid for that material. The temperature at which this occurs is dependent on the ambient pressure. Low-temperature helium is the only known exception to the general rule.
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STATE OF MATTER Hyponyms (each of the following is a kind of state of matter): form; phase ((physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary)
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Phase (matter) A simple description is that a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air over the water is a third phase.The glass of the jar is another separate phase. (See State of Matter#Glass).owever, the state of matter and phase diagram usages are not commensurate with the formal definition given above and the intended meaning must be determined in part from the context in which the term is used.
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Phase Diagrams 1 The major features of a phase diagram are phase boundaries and the triple point. 2  Phase diagrams demonstrate the effects of changes in pressure and temperature on the state of matter.  At phase boundaries, two phases of matter coexist (which two depends on the phase transition taking place).
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- A change of state, also called a phase change, is a physical change from one state of matter to another, for example, from solid to liquid or from liquid to gas.