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Showing 1 - 10 of 94 results
• Updated 2 months ago - 4,245 words
The somewhat less common MLCT has the same intensity and energy of the LMCT as they involve the transition of an electron from the t2g (pi) and the eg (sigma*) to the t1u (pi*/sigma*). In addition, the d-d transitions are lower in energy than the CT band because of the smaller energy gap between the t2g and eg in octahedral complexes (or eg to t2g in tetrahedral complexes) than the energy gap between the ground and excited states of the charge transfer band.
http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Electronic_Spectroscopy/Electronic_Spectroscopy%3A_Interpretation
• Updated 2 months ago - 1,119 words
These diagrams are helpful because they allow us to predict the shape of the molecule and see the positions of each atom relative to the others. In the case of CO 2 , when it comes time to create a lewis structure, it seems as though you don not have enough electrons to complete the octets of all the atoms. If you go about the steps that were given to you above, you will notice that the octets of the oxygen atoms have been filled, but the carbon still needs 4 more electrons.
http://chemwiki.ucdavis.edu/Wikitexts/UC_Davis/UCD_Chem_124A%3A_Kauzlarich/ChemWiki_Module_Topics/Lewis_Structures
• Updated 2 months ago - 1,750 words
The greater the E° cell of a reaction the greater the driving force of electrons through the system, the more likely the reaction will proceed (more spontaneous). *If the E° values of the reaction is negative, then the reaction is NOT spontaneous and therefore the reverse reaction is occuring and the electrons are flowing in the opposite direction.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Electrochemistry_and_Thermodynamics
• Updated 2 months ago - 909 words
The equation above indicates that the electrical potential of a cell depends upon the reaction quotient $$Q$$ of the reaction. As a result, the cell potential continues to decrease and when the cell potential drops down to 0, the concentration of reactants and products stops changing. The equation above indicates that the equilibrium constant K eq is proportional to the standard potential of the reaction.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Nernst_Equation
• Updated 2 months ago - 2,858 words
The standard deviation of an elution peak can be approximated by assuming that a Gaussian elution peak is roughly triangular, in that case the plate height can be given by the width of the elution peak squared times the length of the column over the retention time of the that peak squared times 16.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Instrumental_Analysis/Chromatography/High_performance_liquid_chromatography
• Updated 2 months ago - 2,037 words
Titration is the slow addition of one solution of a known concentration (called a titrant) to a known volume of another solution of unknown concentration until the reaction reaches neutralization, which is often indicated by a color change. The graphs of titration curves effectively show the relationship between the pH of the solution of unknown concentration as the standard solution is added to it in order to reach neutralization.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantitative_Analysis/Titration
• Updated 2 months ago - 2,281 words
By looking at a reduction potential table, it is easy to see that the half reaction Ag + (aq) + e - → Ag(s) has a reduction potential of 0.80V and that the half-reaction Zn 2+ (aq) + 2e - → Zn(s) has a reduction potential of -0.76V. The only difference is adding hydroxide ions (OH - ) to each side of the net reaction to balance any H + . OH - and H + ions on the same side of a reaction should be added together to form water.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Redox_Chemistry/Balancing_Redox_reactions
• Updated 2 months ago - 6,599 words
Since there is a field distribution of E o at the surface of M o, it can be said that there is a field distribution at the surface of M 1 . Since there will be a change in size of the field this means that the electromagnetic wave will have change in amplitude by ρ 0 *ρ 1 and a phase factor of $$e^-jk2d$$, creating additional fields. If λ is the wavelength of the laser light, a is the radius of the beam, and f is the focal length of the lens, then the radius of the region is
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Instrumental_Analysis/Lasers
• Updated 2 months ago - 4,673 words
The last section also implicitly presented the idea that the interferogram measured by an FTIR interferometer is just the sum of the interferograms of all the constituent frequencies present in the source. Figure 10: Convolution of perfectly monochromatic light with the Fourier transform of the truncation function, . The effect of the truncation is to effectively broaden the peak revealing a maximum resolution determined by the total distance capable of being traversed by the mirror.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Instrumental_Analysis/Spectrometer/How_an_FTIR_instrument_works
• Updated 2 months ago - 2,029 words
Figure 1, above, starts with a negative ion sputter source, which commonly consists of a stream of Cesium ions (Cs + ) with energies of 2-3 keV focused on the surface of a solid sample in order to transfer enough energy to the target material to produce free atoms and ions of the sample material.
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Instrumental_Analysis/Mass_Spectrometry/Accelerator_Mass_Spectroscopy
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