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  2. Isomer - Wikipedia

    en.wikipedia.org/wiki/Isomer

    Two main forms of isomerism are structural (or constitutional) isomerism, in which bonds between the atoms differ; and stereoisomerism (or spatial isomerism), in which the bonds are the same but the relative positions of the atoms differ. Isomeric relationships form a hierarchy. Two chemicals might be the same constitutional isomer, but upon ...

  3. Structural isomer - Wikipedia

    en.wikipedia.org/wiki/Structural_isomer

    Enumerating or counting structural isomers in general is a difficult problem, since one must take into account several bond types (including delocalized ones), cyclic structures, and structures that cannot possibly be realized due to valence or geometric constraints, and non-separable tautomers.

  4. Isomerase - Wikipedia

    en.wikipedia.org/wiki/Isomerase

    Calculating isomerase kinetics from experimental data can be more difficult than for other enzymes because the use of product inhibition experiments is impractical. [4] That is, isomerization is not an irreversible reaction since a reaction vessel will contain one substrate and one product so the typical simplified model for calculating ...

  5. Stereoisomerism - Wikipedia

    en.wikipedia.org/wiki/Stereoisomerism

    Anomerism is an identity for single bonded ring structures where "cis" or "Z" and "trans" or "E" (geometric isomerism) needs to name the substitutions on a carbon atom that also displays the identity of chirality; so anomers have carbon atoms that have geometric isomerism and optical isomerism (enantiomerism) on one or more of the carbons of ...

  6. Nuclear isomer - Wikipedia

    en.wikipedia.org/wiki/Nuclear_isomer

    A nuclear isomer is a metastable state of an atomic nucleus, in which one or more nucleons (protons or neutrons) occupy excited state levels (higher energy levels). ). "Metastable" describes nuclei whose excited states have half-lives 100 to 1000 times longer than the half-lives of the excited nuclear states that decay with a "prompt" half life (ordinarily on the order of 10

  7. Block scheduling - Wikipedia

    en.wikipedia.org/wiki/Block_scheduling

    A University of Virginia study of 8,000 college students found that students who had block scheduling in high school performed worse in university science courses. [ 1 ] Some students are better able to manage their time with nightly homework in every class, while other students do better with larger homework assignments that are spaced out ...

  8. Linkage isomerism - Wikipedia

    en.wikipedia.org/wiki/Linkage_isomerism

    In chemistry, linkage isomerism or ambidentate isomerism is a form of isomerism in which certain coordination compounds have the same composition but differ in their metal atom's connectivity to a ligand. Typical ligands that give rise to linkage isomers are: cyanide, CN − – isocyanide, NC −; cyanate, OCN − – isocyanate, NCO −

  9. Allenes - Wikipedia

    en.wikipedia.org/wiki/Allenes

    The symmetry and isomerism of allenes has long fascinated organic chemists. [8] For allenes with four identical substituents, there exist two twofold axes of rotation through the central carbon atom, inclined at 45° to the CH 2 planes at either end of the molecule. The molecule can thus be thought of as a two-bladed propeller.