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  2. Solvent - Wikipedia

    en.wikipedia.org/wiki/Solvent

    A solvent dissolves a solute, resulting in a solution Ethyl acetate, a nail polish solvent. [1]A solvent (from the Latin solvō, "loosen, untie, solve") is a substance that dissolves a solute, resulting in a solution.

  3. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Addition of fractions is much simpler when the denominators are the same; in this case, one can simply add the numerators while leaving the denominator the same: + = +, so + = + =. [ 63 ] The commutativity and associativity of rational addition is an easy consequence of the laws of integer arithmetic. [ 64 ]

  4. Lithium - Wikipedia

    en.wikipedia.org/wiki/Lithium

    Thus, the Democratic Republic of Congo is expected to be a significant supplier of lithium to the world with its high grade and low impurities. On 16 July 2018 2.5 million tonnes of high-grade lithium resources and 124 million pounds of uranium resources were found in the Falchani hard rock deposit in the region Puno, Peru. [121]

  5. Viscosity - Wikipedia

    en.wikipedia.org/wiki/Viscosity

    Viscosity is a measure of a fluid's rate-dependent resistance to a change in shape or to movement of its neighboring portions relative to one another. [1] For liquids, it corresponds to the informal concept of thickness; for example, syrup has a higher viscosity than water. [2]

  6. Noble gas - Wikipedia

    en.wikipedia.org/wiki/Noble_gas

    The simplest is the helium hydride molecular ion, HeH +, discovered in 1925. [59] Because it is composed of the two most abundant elements in the universe, hydrogen and helium, it was believed to occur naturally in the interstellar medium , and it was finally detected in April 2019 using the airborne SOFIA telescope .

  7. Ethanol - Wikipedia

    en.wikipedia.org/wiki/Ethanol

    Ethanol-water mixtures have less volume than the sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture. [75] [80] Mixing ethanol and water is exothermic, with up to 777 J/mol [81] being released at 298 K. Hydrogen bonding in solid ethanol at −186 °C

  8. Chiang Kai-shek - Wikipedia

    en.wikipedia.org/wiki/Chiang_Kai-shek

    With help from foreign military advisers such as Max Bauer and Alexander von Falkenhausen, Chiang's Fifth Campaign finally surrounded the Chinese Red Army in 1934. [53] The Communists, tipped off that a Nationalist offensive was imminent, retreated in the Long March during which Mao rose from a mere military official to the most influential ...

  9. Nicholas II - Wikipedia

    en.wikipedia.org/wiki/Nicholas_II

    Nicholas, unbreeched at two years old, with his mother, Maria Feodorovna, in 1870 Grand Duke Nicholas was born on 18 May [O.S. 6 May] 1868, in the Alexander Palace in Tsarskoye Selo south of Saint Petersburg, during the reign of his paternal grandfather, Emperor Alexander II.

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