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  2. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

  3. IUPAC nomenclature of organic chemistry - Wikipedia

    en.wikipedia.org/wiki/IUPAC_nomenclature_of...

    For secondary amines (of the form R−NH−R), the longest carbon chain attached to the nitrogen atom becomes the primary name of the amine; the other chain is prefixed as an alkyl group with location prefix given as an italic N: CH 3 NHCH 2 CH 3 is N-methylethanamine.

  4. Reactivity series - Wikipedia

    en.wikipedia.org/wiki/Reactivity_series

    In chemistry, a reactivity series (or reactivity series of elements) is an empirical, calculated, and structurally analytical progression [1] of a series of metals, arranged by their "reactivity" from highest to lowest.

  5. Brønsted–Lowry acid–base theory - Wikipedia

    en.wikipedia.org/wiki/Brønsted–Lowry_acid...

    [15] In Lewis theory an acid, A, and a base, B, form an adduct, AB, where the electron pair forms a dative covalent bond between A and B. This is shown when the adduct H 3 N−BF 3 forms from ammonia and boron trifluoride , a reaction that cannot occur in water because boron trifluoride hydrolizes in water.

  6. Form (education) - Wikipedia

    en.wikipedia.org/wiki/Form_(education)

    A common practice is the year number followed by the initials of the teacher who takes the form class (e.g., a Year 7 form whose teacher is John Smith would be "7S"). Alternatively, some schools use "vertical" form classes where pupils across several year groups from the same school house are grouped together.

  7. Chemical reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_reaction

    Such reactions require the addition of energy in the form of heat or light. A typical example of a unimolecular reaction is the cis–trans isomerization, in which the cis-form of a compound converts to the trans-form or vice versa. [15] In a typical dissociation reaction, a bond in a molecule splits (ruptures) resulting in two molecular fragments.

  8. Rate equation - Wikipedia

    en.wikipedia.org/wiki/Rate_equation

    In chemistry, the rate equation (also known as the rate law or empirical differential rate equation) is an empirical differential mathematical expression for the reaction rate of a given reaction in terms of concentrations of chemical species and constant parameters (normally rate coefficients and partial orders of reaction) only. [1]

  9. TES (magazine) - Wikipedia

    en.wikipedia.org/wiki/TES_(magazine)

    The Resources section is a platform for teachers to share original classroom resources, including lesson plans, PowerPoint presentations, interactive whiteboard resources, worksheets, and activities. As of May 2017, there have been over 1 billion downloads of classroom resources from the TES platform.

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