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  2. AP World History: Modern - Wikipedia

    en.wikipedia.org/wiki/AP_World_History:_Modern

    Number of Questions Time allotted Exam Weight Section I, Part A: Multiple Choice Questions: 55 questions: 55 minutes: 40% Section I, Part B: Short-Answer Questions: 3 questions (2 required questions + 1 chosen from 2 others) 40 minutes: 20% Section II Part A: Document-Based Question: 1 question: recommended 60 minutes (includes 15-minute ...

  3. AP European History - Wikipedia

    en.wikipedia.org/wiki/AP_European_History

    The AP exam for European History is divided into two sections, comprising 55 multiple-choice questions (with four answer choices), three short-answer questions, and two essay responses (one thematic Long Essay Question (LEQ) and one Document Based Question (DBQ)). [3]

  4. Berkelium - Wikipedia

    en.wikipedia.org/wiki/Berkelium

    The +3 state is the most stable, especially in solutions, while the tetravalent halides BkF 4 and Cs 2 BkCl 6 are only known in the solid phase. [66] The coordination of berkelium atom in its trivalent fluoride and chloride is tricapped trigonal prismatic , with the coordination number of 9.

  5. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    According to a report published by the Water Footprint organization in 2010, a single kilogram of beef requires 15 thousand litres (3.3 × 10 ^ 3 imp gal; 4.0 × 10 ^ 3 US gal) of water; however, the authors also make clear that this is a global average and circumstantial factors determine the amount of water used in beef production.

  6. Catalysis - Wikipedia

    en.wikipedia.org/wiki/Catalysis

    An illustrative example is the effect of catalysts to speed the decomposition of hydrogen peroxide into water and oxygen: . 2 H 2 O 2 → 2 H 2 O + O 2. This reaction proceeds because the reaction products are more stable than the starting compound, but this decomposition is so slow that hydrogen peroxide solutions are commercially available.

  7. Lithium iron phosphate - Wikipedia

    en.wikipedia.org/wiki/Lithium_iron_phosphate

    4 adopts a P mnb space group with a unit cell volume of 272.4 Å 3, only slightly smaller than that of its lithiated precursor. Extraction of lithium ions reduces the lattice volume, as is the case with lithium oxides. LiFePO 4 's corner-shared FeO 6 octahedra are separated by the oxygen atoms of the PO 34 tetrahedra and cannot form a ...

  8. Physics - Wikipedia

    en.wikipedia.org/wiki/Physics

    [2] [3] [4] A scientist who specializes in the field of physics is called a physicist. Physics is one of the oldest academic disciplines . [ 5 ] Over much of the past two millennia, physics, chemistry , biology , and certain branches of mathematics were a part of natural philosophy , but during the Scientific Revolution in the 17th century ...

  9. Linux - Wikipedia

    en.wikipedia.org/wiki/Linux

    This is an accepted version of this page This is the latest accepted revision, reviewed on 26 January 2025. Family of Unix-like operating systems This article is about the family of operating systems. For the kernel, see Linux kernel. For other uses, see Linux (disambiguation). Operating system Linux Tux the penguin, the mascot of Linux Developer Community contributors, Linus Torvalds Written ...

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