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2,2′-Dipyridyldisulfide, sometimes known as DPS, is used for preparing thiols [1] [2] and activating carboxylic acid for coupling reactions, as in the following reaction: [3] Uses [ edit ]
Disintegrations per minute (dpm) and disintegrations per second (dps) are measures of the activity of the source of radioactivity. The SI unit of radioactivity, the becquerel (Bq), is equivalent to one disintegration per second. This unit should not be confused with cps, which is the number of counts received by an instrument from the source.
The area required to calculate the volumetric flow rate is real or imaginary, flat or curved, either as a cross-sectional area or a surface. The vector area is a combination of the magnitude of the area through which the volume passes through, A , and a unit vector normal to the area, n ^ {\displaystyle {\hat {\mathbf {n} }}} .
Iron rusting has a low reaction rate. This process is slow. Wood combustion has a high reaction rate. This process is fast. The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. [1]
As an example, consider the gas-phase reaction NO 2 + CO → NO + CO 2.If this reaction occurred in a single step, its reaction rate (r) would be proportional to the rate of collisions between NO 2 and CO molecules: r = k[NO 2][CO], where k is the reaction rate constant, and square brackets indicate a molar concentration.
Degrees per second, a unit for measuring angular velocity; Direct Print Standard, part of PictBridge standard; Display PostScript, an on-screen display system; Dynamic positioning system, a means to automatically maintain a ship's position and heading by using her own propellers and thrusters; DPS protocol, a quantum key distribution protocol
The change in the extent of reaction is then defined as [2] [3] d ξ = d n i ν i {\displaystyle d\xi ={\frac {dn_{i}}{\nu _{i}}}} where n i {\displaystyle n_{i}} denotes the number of moles of the i t h {\displaystyle i^{th}} reactant or product and ν i {\displaystyle \nu _{i}} is the stoichiometric number [ 4 ] of the i t h {\displaystyle i ...
The distribution constant (or partition ratio) (K D) is the equilibrium constant for the distribution of an analyte in two immiscible solvents. [1] [2] [3]In chromatography, for a particular solvent, it is equal to the ratio of its molar concentration in the stationary phase to its molar concentration in the mobile phase, also approximating the ratio of the solubility of the solvent in each phase.