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  2. Solvent effects - Wikipedia

    en.wikipedia.org/wiki/Solvent_effects

    The determining factor when both S N 2 and S N 1 reaction mechanisms are viable is the strength of the Nucleophile. Nuclephilicity and basicity are linked and the more nucleophilic a molecule becomes the greater said nucleophile's basicity. This increase in basicity causes problems for S N 2 reaction mechanisms when the solvent of choice is protic.

  3. Substitution reaction - Wikipedia

    en.wikipedia.org/wiki/Substitution_reaction

    This results in S N 1 reactions usually occurring on atoms with at least two carbons bonded to them. [2] A more detailed explanation of this can be found in the main SN1 reaction page. S N 2 reaction mechanism. The S N 2 mechanism has just one step. The attack of the reagent and the expulsion of the leaving group happen simultaneously.

  4. Metal detector - Wikipedia

    en.wikipedia.org/wiki/Metal_detector

    U.S. Army soldiers use a military standard metal detector. A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft [dubious – discuss], and a variable-shaped ...

  5. SpaceX Starship (spacecraft) - Wikipedia

    en.wikipedia.org/wiki/SpaceX_Starship_(spacecraft)

    In December 2018, the structural material was changed from carbon composites [87] [80] to stainless steel, [88] [89] marking the transition from early design concepts of the Starship. [ 88 ] [ 90 ] [ 91 ] Musk cited numerous reasons for the design change; low cost and ease of manufacture, increased strength of stainless steel at cryogenic ...

  6. SN1 reaction - Wikipedia

    en.wikipedia.org/wiki/SN1_reaction

    An example of a reaction proceeding in a S N 1 fashion is the synthesis of 2,5-dichloro-2,5-dimethylhexane from the corresponding diol with concentrated hydrochloric acid: [8] As the alpha and beta substitutions increase with respect to leaving groups, the reaction is diverted from S N 2 to S N 1.

  7. Photon counting - Wikipedia

    en.wikipedia.org/wiki/Photon_counting

    Photon counting eliminates gain noise, where the proportionality constant between analog signal out and number of photons varies randomly. Thus, the excess noise factor of a photon-counting detector is unity, and the achievable signal-to-noise ratio for a fixed number of photons is generally higher than the same detector without photon counting.

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    www.aol.com/top-10-stocks-buy-2024-211100857.html

    If you'd instead put your $10,000 into an S&P 500 (SNPINDEX: ^GSPC) index fund, you would've had just $11,900 at the end of the year. An equal investment in an S&P 500 index fund would be worth ...

  9. Darzens reaction - Wikipedia

    en.wikipedia.org/wiki/Darzens_reaction

    The oxygen anion in this aldol-like product then S N 2 attacks on the formerly-nucleophilic halide-bearing position, displacing the halide to form an epoxide. [2] This reaction sequence is thus a condensation reaction since there is a net loss of HCl when the two reactant molecules join. [7] Arrow-pushing mechanism for the Darzens reaction.

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