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Showing 1 - 10 of 91 results
  • Updated 9 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 9 months ago - 866 words
    During the light reactions, energy from light is used to make ATP and NADPH, which are used to provide energy for the making of glucose, for exmple. Chlorophyll: Chlorophyll is a pigment that absorbs light in the blue and red wavelengths, which appears green to our eyes.The primary types are chlorophyll a and chlorophyll b. Thylakoid membranes: This is where the chlorophyll, which are carriers for electron transport and are the required components for synthesis of ATP and NADPH, are stored.
    http://chemwiki.ucdavis.edu/Biological_Chemistry/Photosynthesis/Photosynthesis_overview
  • Updated 9 months ago - 617 words
    If each of the three substituents in this transition state were small hydrogen atoms, as illustrated in the first example below, there would be little steric repulsion between the incoming nucleophile and the electrophilic center, thereby increasing the ease at which the nucleophilic substitution reaction can occur.
    http://chemwiki.ucdavis.edu/Organic_Chemistry/Reactions/SN2_Reaction/Substrate
  • Updated 9 months ago - 2,695 words
    Where Y is the absolute yield, N is the number of atoms a given nucleus formed, and P is the number of fission events. The fissile material is encased in a solid cladding, made of Zircalloy, to contain both the fuel and the resulting fission products and keep then from escaping into the moderator, coolant, or anywhere outside the cladding.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Nuclear_Chemistry/Fission_and_Fusion/Nuclear_Chain_Reactions
  • Updated 9 months ago - 3,060 words
    Rayleigh scattering comes from the dipole oscillating at ω 0 induced in the molecule by the electric field of the incident radiation at frequency ω 0 . Raman scattering arises from the dipole moment oscillating at ω 0 ±ω k produced by the modulation of dipole oscillating at ω 0 with molecular vibration at frequency ω k . In other words, the frequencies we observe in Raman scattering are beat frequencies of the radiation frequency ω 0­ and the molecular vibrational frequency ω k . Quantum mechan…
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Vibrational_Spectroscopy/Raman_Spectroscopy/Raman%3A_Theory
  • Updated 9 months ago - 2,745 words
    Because the vibrations have nearly the same frequency, the interaction will be affected if one mode undergoes a frequency shift from deuteration or a solvent effect while the other does not.The molecule most studied for this type of resonance (even what Fermi himself used to explain this phenomena), is carbon dioxide, CO 2 . The three fundamental vibrations are v 1 = 1337 cm -1 , v 2 =667 cm -1 , v 3 =2349 cm -1 . The first overtone of v 2 is v 1 + 2v 2 with symmetries σ g + and (σ g + + δ g + …
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Vibrational_Spectroscopy/Vibrational_Modes/Combination_Bands%2C_Overtones_and_Fermi_Resonances
  • Updated 9 months ago - 5 words
    Page created for new attachment
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Quantum_Mechanics/Quantum_Theory/Trapped_Particles/Potential_Barriers
  • Updated 9 months ago - 1,152 words
    B is the magnetic field vector, is the Bohr magneton, S z is the z projection of the spin, and is the angle of the applied magnetic field with respect to the symmetry axis of the system in the zx-plane. We have shown that, by taking linear combinations of the and states that show no transitions, we can construct a description of the system that accounts for the transitions observed in the parallel mode EPR spectra of integer spin systems.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Magnetic_Resonance_Spectroscopies/Electron_Paramagnetic_Resonance/Parallel_Mode_EPR%3A_Theory_and_Application
  • Updated 9 months ago - 7,849 words
    The electronic-state configurations for molecules can be described by the primary quantum number n, the angular momentum quantum number Λ, the spin quantum number S, which remains a good quantum number, the quantum number Σ (S, S-1, ..., -S), and the projection of the total angular momentum quantum number onto the molecular symmetry axis Ω, which can be derived as Ω=Λ+Σ.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Fundamentals/Selection_rules_and_transition_moment_integral
  • Updated 9 months ago - 1,688 words
    Thus, the magnetic field is on the x-axis of EPR spectrum; dχ″/dB, the derivative of the imaginary part of the molecular magnetic susceptibility with respect to the external static magnetic field in arbitrary units is on the y-axis. This value contains the chemical information that lies in the interaction between the electron and the electronic structure of the molecule, one can simply take the value of g = g e + Δg as a fingerprint of the molecule.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Magnetic_Resonance_Spectroscopies/Electron_Paramagnetic_Resonance/EPR%3A_Interpretation
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