Analytical Chemistry
 
Category: Analytical Chemistry
one of two or more Lewis structures representing a single molecule with bonding that cannot be described fully with only one Lewis structure
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chemical reactivity and physical properties (state of aggregation, solvent properties, etc.)? Can we develop the ability to predict these properties? What gives rise to the periodicities of elemental properties embodied in the periodic table
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ABC algorithms can usually be improved by adjusting the ith accepted parameter value i to correct for the (small) discrepancy between its corresponding summary statistic Si and the observed value S. Fitting the homoscedastic regression model
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you learned that when an electron is raised from a lower energy level to a higher energy level, electromagnetic energy is absorbed and when an electron drops from a higher energy level to a lower energy level, electromagnetic energy is emitted. Such transitions are referred to as electronic transitions
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Spectral resolution is determined primarily by three factors. First, the transverse relaxation time (T2) of the metabolite is inversely proportional to the ideal peak width. Second, the B0 separation between peaks ~in Hz! increases linearly with magnetic field strength.
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The irregularity in boiling point trends in Figure 10.20 is due to a particularly strong dipole-dipole force called hydrogen bonding.
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One of the main difficulties in the study of solutions is the wide variety of variables and units used to specify concentration
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An incontrovertible law of nature states: “Nothing is perfect”. This law applies to humans as well as to the inorganic world of crystalline solids and can be formulated as the 2nd law of thermodynamics
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Radioactive decay and half-lives of radioactive elements
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Atmospheric observations suggest that photochemistry in the upper troposphere has a much greater global significance than previously believed. The production of O3 in this region is significant and is controlled by interaction of the HOx and NOx radical families
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electroanalysis, sensors, energy storage and conversion devices, corrosion, electrosynthesis, and metal electroplating.
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The results of our work suggest two generalizations about these resonance substituent effects. (1) The stabilization of carbocations or carbanions by resonance delocalization of positive or negative charge is not constant but, rather, is attenuated by polar substituents attached to the charged center.
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Polycyclic aromatic hydrocarbons (PAHs) are a large group of organic compounds with two or more fused aromatic rings.
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Photochemistry, the branch of chemistry that deals with the chemical processes that are caused by the absorption of light energy. The process by which a photochemical reaction is carried out is called photolysis.
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A fundamental study into the formation of co-crystals involving organosulfur and organophosphorus compounds, with a wide variety of other functional groups, e.g. amide, sulfonamides, thioamides and thiourea, and related compounds.
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Kinetic theory of gases; First law of thermodynamics, heat, energy, and work; second law of thermodynamics and entropy; third law and absolute entropy; free energy; partial molar quantities; ideal and non-ideal solutions; phase transformation
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Elements of crystallography; diffraction methods for structure determination; bonding in solids; elastic properties of solids; defects in crystals; lattice vibrations and thermal properties of solids; free electron theory; band theory of solids; metals, semiconductors and insulators; transport properties; optical, dielectric and magnetic properties of solids; elements of superconductivity.
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The determination of the mechanism of a chemical reaction is much more than anintellectual exercise. Unravelling the proposed steps by which the reagents in a reaction mixture are converted to the observed products takes careful and conservative interpretation of painstaking experiments.
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In heterocyclic chemistry there is a special name for each individual ring system and a trivial name for each compound. Trivial names convey little or no structural information but they are still widely used.
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Dyeing is an ancient art which predates written records. It was practised during the Bronze age in Europe. Primitive dyeing techniques included sticking plants to fabric or rubbing crushed pigments into cloth.
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From dihalogen compounds : α‐ω elimination from dihalides having halogen atoms on two ends of carbon chain (α‐ω dihalides) with Na or Zn dust gives rise to the formation of cycloalkanes.
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A discussion of the general synthesis of the precursors used in the synthesis of β-diketones as well as a discussion of the general chemistry of ruthenocene derivatives is presented.
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The electronic structure of substances is such to cause each atom to have essentially zero resultant charge. No atom will have an actual charge greater than  1. i.e. the formal charge is not the actual charge distribution
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reaction of organocopper reagents with acid chlorides affords corresponding ketones in high yields. Retrosynthetically, the reaction amounts to an alkylation of a carboxylic acid.
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the system will configure the spins in such a way that the free energy is minimised. At high temperatures the entropy contribution will be dominant but at lower temperatures the free energy might be minimised by having an ordered spin state
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