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Homogeneity and heterogeneity; only ' b ' is homogeneous Homogeneity and heterogeneity are concepts relating to the uniformity of a substance, process or image.A homogeneous feature is uniform in composition or character (i.e., color, shape, size, weight, height, distribution, texture, language, income, disease, temperature, radioactivity, architectural design, etc.); one that is heterogeneous ...
These terms are derived from the idea that a homogeneous mixture has a uniform appearance, or only one phase, because the particles are evenly distributed. However, a heterogeneous mixture has constituent substances that are in different phases and easily distinguishable from one another. In addition, a heterogeneous mixture may have a uniform ...
The IUPAC definition of a solid solution is a "solid in which components are compatible and form a unique phase". [3]The definition "crystal containing a second constituent which fits into and is distributed in the lattice of the host crystal" given in refs., [4] [5] is not general and, thus, is not recommended.
The solution-phase intermediates are not necessarily distinguishable from those obtained during homogeneous cross-couplings – for example, a heterogeneous Pd-catalyzed Suzuki reaction still proceeds via oxidative addition of the electrophile by Pd(0), transmetallation of a boronate, and reductive elimination to give product and regenerate Pd ...
There are then questions as to whether, if the records are combined to form a single longer set of records, those records can be considered homogeneous over time. An example of homogeneity testing of wind speed and direction data can be found in Romanić et al., 2015. [9]
In industrial process engineering, mixing is a unit operation that involves manipulation of a heterogeneous physical system with the intent to make it more homogeneous. Familiar examples include pumping of the water in a swimming pool to homogenize the water temperature, and the stirring of pancake batter to eliminate lumps (deagglomeration).
The proton is a pervasive homogeneous catalyst [4] because water is the most common solvent. Water forms protons by the process of self-ionization of water. In an illustrative case, acids accelerate (catalyze) the hydrolysis of esters: CH 3 CO 2 CH 3 + H 2 O ⇌ CH 3 CO 2 H + CH 3 OH. At neutral pH, aqueous solutions of most esters do not ...
Some examples of catalysis are: [10] Homogeneous acid catalysis hydrolysis of propene to give propan-2-ol by H 3 PMo 12 O 40 and H 3 PW 12 O 40; Prins reaction by H 3 PW 12 O 40; polymerisation of THF by H 3 PW 12 O 40; Heterogeneous acid catalysis dehydration of propan-2-ol to propene and methanol to hydrocarbons by H 3 PW 12 O 40