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  • Updated 14 months ago
    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 14 months ago
    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 14 months ago
    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 14 months ago
    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 14 months ago
    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 14 months ago
    Through a careful study of multiple model compounds of known oxidation states and spin configurations, from Ni(I), to low- and high-spin Ni(III) up to Ni(IV), a relationship is derived between the position of the L 3 edge and the ratio of the integrals of the L 3 and L 2 edges.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/X-ray_Spectroscopy/XANES%3A_Application
  • Updated 14 months ago
    The first type of arrow, shown in pink, originates from the electron pair of the nucleophile and extends to the electrophilic carbon of the haloalkane. The simplest way to think about this in any mechanism you learn is that electrons will be pushed from an electron rich species or site to an electron poor species or site, and the direction of the curved arrow will indicate this.
    http://chemwiki.ucdavis.edu/Organic_Chemistry/Reactions/Pushing_Arrows
  • Updated 14 months ago
    This rule states that the absorption coefficient is proportional to the square of the transition moment integral, or |<i|H|f>| 2 , where i is the unaffected core energy level before it interferes with the neighboring atoms, H is the interaction, and f is the final state in which the core energy level has been affected and a photoelectron has been ejected.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/X-ray_Spectroscopy/EXAFS%3A_Theory
  • Updated 14 months ago
    In order to observe resonance, the frequency of the microwaves must correspond to the splitting of the spin states of the electron, which is determined by the strength of the magnetic field. The peaks seen in figure 12 correspond to specific quantitative parameters that describe the coupling of the electron and the nucleus, thus corresponding to the distance between the nuclei and the electron.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Magnetic_Resonance_Spectroscopies/Electron_Paramagnetic_Resonance/EPR%3A_Application
  • Updated 14 months ago
    V m which is the natural frequency of the mechanical oscillator which depends on the force constant of the spring and the mass of the attached body and independent of energy imparted on the system. Where A is the absorbance of the sample, I is the intensity of transmitted light, I 0 is the intensity of incident light, l is the path length, a is the molar absorptivity of the substance, and c is the concentration of the substance.
    http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Vibrational_Spectroscopy/Infrared_Spectroscopy/Infrared%3A_Theory
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