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  2. Quantitative analysis (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Quantitative_analysis...

    In analytical chemistry, quantitative analysis is the determination of the absolute or relative abundance (often expressed as a concentration) of one, several or all particular substance(s) present in a sample. [1] It relates to the determination of percentage of constituents in any given sample. [2]

  3. Chemical reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_reaction

    For example, when barium chloride (BaCl 2) and magnesium sulfate (MgSO 4) react, the SO 4 2− anion switches places with the 2Cl − anion, giving the compounds BaSO 4 and MgCl 2. Another example of a double displacement reaction is the reaction of lead(II) nitrate with potassium iodide to form lead(II) iodide and potassium nitrate : Pb ( NO 3 ...

  4. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus.The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus.

  5. Crash Course (web series) - Wikipedia

    en.wikipedia.org/wiki/Crash_Course_(web_series)

    Literature 2 Literature 3 Literature 4: 8 16 9 12 November 15, 2012 February 27, 2014 July 7, 2016 November 7, 2017 January 24, 2013 June 12, 2014 September 8, 2016 February 13, 2018 John Green John Green Alexis Soloski Launched in 2013 US History: 48 January 31, 2013 February 6, 2014 John Green John Green Raoul Meyer Chemistry: 46 February 11 ...

  6. Lessons in Chemistry - Wikipedia

    en.wikipedia.org/wiki/Lessons_in_Chemistry

    Download as PDF; Printable version; In other projects Wikidata item; Appearance. move to sidebar hide. Lessons in Chemistry may refer to : Lessons in Chemistry, a ...

  7. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Oxygen (1s 2 2s 2 2p 4), fluorine (1s 2 2s 2 2p 5), and neon (1s 2 2s 2 2p 6) then complete the already singly filled 2p orbitals; the last of these fills the second shell completely. [ 39 ] [ 58 ] Starting from element 11, sodium , the second shell is full, making the second shell a core shell for this and all heavier elements.

  8. Tosyl group - Wikipedia

    en.wikipedia.org/wiki/Tosyl_group

    Tosyl group (blue) with a generic "R" group attached Tosylate group with a generic "R" group attached. Note the extra oxygen, compared to plain tosyl. In organic chemistry, a toluenesulfonyl group (tosyl group, abbreviated Ts or Tos [nb 1]) is a univalent functional group with the chemical formula −SO 2 −C 6 H 4 −CH 3.

  9. Period 5 element - Wikipedia

    en.wikipedia.org/wiki/Period_5_element

    A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall ...