Search results
Results From The WOW.Com Content Network
Note: This Frost diagram for nitrogen is also incomplete as it lacks azide (N − 3, or hydrazoic acid, HN 3), presented here above in the former Frost diagram for nitrogen. The pH dependence is given by the factor −0.059 m / n per pH unit, where m relates to the number of protons in the equation, and n the number of electrons exchanged.
Example: a mixture of Mn(III) and Mn(VI) will comproportionate towards Mn(IV) as illustrated in the Frost diagram for manganese. Non-adjacent neighboring species of Mn obeying the same general rule will also react together as, e.g., Mn 2+ and MnO − 4 to form MnO 2. So, the more distant Mn(II) and Mn(VII) can also react together to form Mn(IV).
Photograph taken 21 March 2010 in Norwich, Vermont. Frost heaving (or a frost heave) is an upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil (the freezing front or freezing boundary).
Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice. The term serves as an umbrella term for a variety of processes, such as frost shattering, frost wedging, and cryofracturing.
Latimer diagrams can be used in the construction of Frost diagrams, as a concise summary of the standard electrode potentials relative to the element. Since Δ r G o = -n F E o , the electrode potential is a representation of the Gibbs energy change for the given reduction.
The energy levels for cyclic systems can be predicted using the Frost circle mnemonic (named after the American chemist Arthur Atwater Frost ). A circle centered at α with radius 2β is inscribed with a regular N- gon with one vertex pointing down; the y -coordinate of the vertices of the polygon then represent the orbital energies of the [ N ...
[4] [5] [6] The CALPHAD approach is based on the fact that a phase diagram is a manifestation of the equilibrium thermodynamic properties of the system, which are the sum of the properties of the individual phases. [7] It is thus possible to calculate a phase diagram by first assessing the thermodynamic properties of all the phases in a system.
Möbius–Hückel correlation diagram; two modes of butadiene to cyclobutene conversion. It has been noted that for every degeneracy along a reaction coordinate there is a molecular orbital crossing. [4] Thus for the butadiene to cyclobutene conversion, the two Möbius (here conrotatory) and Hückel (here disrotatory) modes are shown in Figure 5.