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  2. AP United States History - Wikipedia

    en.wikipedia.org/wiki/AP_United_States_History

    The AP U.S. History exam lasts 3 hours and 15 minutes and consists of two sections, with the first (Section I) being divided into two parts. Section I part A includes 55 multiple-choice questions with each question containing four choices.

  3. Solution (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Solution_(chemistry)

    Making a saline water solution by dissolving table salt in water.The salt is the solute and the water the solvent. In chemistry, a solution is defined by IUPAC as "A liquid or solid phase containing more than one substance, when for convenience one (or more) substance, which is called the solvent, is treated differently from the other substances, which are called solutes.

  4. Multiple choice - Wikipedia

    en.wikipedia.org/wiki/Multiple_choice

    A multiple choice question, with days of the week as potential answers. Multiple choice (MC), [1] objective response or MCQ(for multiple choice question) is a form of an objective assessment in which respondents are asked to select only the correct answer from the choices offered as a list.

  5. Law of definite proportions - Wikipedia

    en.wikipedia.org/wiki/Law_of_definite_proportions

    The law of definite proportion was given by Joseph Proust in 1797. [2]I shall conclude by deducing from these experiments the principle I have established at the commencement of this memoir, viz. that iron like many other metals is subject to the law of nature which presides at every true combination, that is to say, that it unites with two constant proportions of oxygen.

  6. Glossary of engineering: A–L - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_engineering:_A–L

    Barometer A device for measuring pressure. Battery Electrochemical cells that transform chemical energy into electricity. Base In chemistry, bases are substances that, in aqueous solution, release hydroxide (OH −) ions, are slippery to the touch, can taste bitter if an alkali, [50] change the color of indicators (e.g., turn red litmus paper blue), react with acids to form salts, promote ...

  7. John C. Calhoun - Wikipedia

    en.wikipedia.org/wiki/John_C._Calhoun

    [12] [13] Calhoun made friends easily, read widely, and was a noted member of the debating society of Brothers in Unity. He graduated as valedictorian in 1804. He graduated as valedictorian in 1804. He studied law at the nation's first independent law school, Tapping Reeve Law School in Litchfield, Connecticut , where he worked with Tapping ...

  8. Twelfth Amendment to the United States Constitution

    en.wikipedia.org/wiki/Twelfth_Amendment_to_the...

    The Twelfth Amendment (Amendment XII) to the United States Constitution provides the procedure for electing the president and vice president. It replaced the procedure in Article II, Section 1, Clause 3 , under which the Electoral College originally functioned.

  9. Perestroika - Wikipedia

    en.wikipedia.org/wiki/Perestroika

    Perestroika (/ ˌ p ɛr ə ˈ s t r ɔɪ k ə / PERR-ə-STROY-kə; Russian: перестройка, IPA: [pʲɪrʲɪˈstrojkə] ⓘ) [1] was a political reform movement within the Communist Party of the Soviet Union (CPSU) during the late 1980s, widely associated with CPSU general secretary Mikhail Gorbachev and his glasnost (meaning "transparency") policy reform.