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  2. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.

  3. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    The 21 proteinogenic α-amino acids found in eukaryotes, grouped according to their side chains' pK a values and charges carried at physiological pH (7.4) 2- , alpha- , or α-amino acids [ 21 ] have the generic formula H 2 NCHRCOOH in most cases, [ b ] where R is an organic substituent known as a " side chain ".

  4. AP Precalculus - Wikipedia

    en.wikipedia.org/wiki/AP_Precalculus

    1.2 Rates of Change 2 1.3 Rates of Change in Linear and Quadratic Functions 2 1.4 Polynomial Functions and Rates of Change 2 1.5 Polynomial Functions and Complex Zeros 2 1.6 Polynomial Functions and End Behavior 1 1.7 Rational Functions and End Behavior 2 1.8 Rational Functions and Zeros 1 1.9 Rational Functions and Vertical Asymptotes 1 1.10

  5. Plate tectonics - Wikipedia

    en.wikipedia.org/wiki/Plate_tectonics

    Plate tectonics (from Latin tectonicus, from Ancient Greek τεκτονικός (tektonikós) 'pertaining to building') [1] is the scientific theory that the Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago.

  6. Sokoto Caliphate - Wikipedia

    en.wikipedia.org/wiki/Sokoto_Caliphate

    An estimated 1 to 2.5 million non-Muslim slaves were captured during the Fulani War. [11] Slaves worked plantations and much of the population converted to Islam despite being encouraged not to. [ 8 ] [ 12 ] By 1900, Sokoto had "at least 1 million and perhaps as many as 2.5 million slaves" second only to the American South (which had four ...

  7. Umayyad state of Córdoba - Wikipedia

    en.wikipedia.org/wiki/Umayyad_state_of_Córdoba

    The Emirate of Córdoba, from 929, the Caliphate of Córdoba, was an Arab Islamic state ruled by the Umayyad dynasty from 756 to 1031. Its territory comprised most of the Iberian Peninsula (known to Muslims as al-Andalus), the Balearic Islands, and parts of North Africa, with its capital in Córdoba (at the time Qurṭubah).

  8. Reactions to the 1989 Tiananmen Square protests and massacre

    en.wikipedia.org/wiki/Reactions_to_the_1989...

    Yan Xiaoqiao, a PhD chemistry student enrolled in Simon Fraser University, said "today is one of the darkest days in Chinese history". [74] Many of the Chinese foreign exchange students studying in Canada opted to apply for permanent residency in the aftermath of 4 June rather than return to China. [81]