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  2. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    At 25 °C (77 °F), solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic. Solutions with a pH of 7 at 25 °C are neutral (i.e. have the same concentration of H + ions as OH − ions, i.e. the same as pure water). The neutral value of the pH depends on the temperature and is lower than 7 if the temperature ...

  3. 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.

  4. Basis set (chemistry) - Wikipedia

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

    In theoretical and computational chemistry, a basis set is a set of functions (called basis functions) that is used to represent the electronic wave function in the Hartree–Fock method or density-functional theory in order to turn the partial differential equations of the model into algebraic equations suitable for efficient implementation on a computer.

  5. Problem solving - Wikipedia

    en.wikipedia.org/wiki/Problem_solving

    Problem solving in psychology refers to the process of finding solutions to problems encountered in life. [5] Solutions to these problems are usually situation- or context-specific. The process starts with problem finding and problem shaping, in which the problem is discovered and simplified. The next step is to generate possible solutions and ...

  6. Phase diagram - Wikipedia

    en.wikipedia.org/wiki/Phase_diagram

    The pressure on a pressure-temperature diagram (such as the water phase diagram shown above) is the partial pressure of the substance in question. A phase diagram in physical chemistry , engineering , mineralogy , and materials science is a type of chart used to show conditions (pressure, temperature, etc.) at which thermodynamically distinct ...

  7. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    For example, daily homework may be counted as 50% of the final grade, chapter quizzes may count for 20%, the comprehensive final exam may count for 20%, [1] and a major project may count for the remaining 10%. Each are created to evaluate the students' understanding of the material and of their complex understanding of the course material.

  8. List of airlines of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_airlines_of_the...

    This is a list of airlines that have an air operator's certificate issued by the Federal Aviation Administration of the United States.. Note: Destinations in bold indicate primary hubs, those in italic indicate secondary hubs, and those with regular font indicate focus cities.

  9. Curtiss P-6 Hawk - Wikipedia

    en.wikipedia.org/wiki/Curtiss_P-6_Hawk

    XP-6 Model 34P, modified from a P-1 with a Curtiss V-1570-17 Conqueror engine XP-6A Model 34K, same as XP-6 but with untapered wings and wing radiators to reduce drag P-6A 18 ordered by the U.S. Army, nine were fitted with Prestone- rather than water-cooled V-1570 engines XP-6B P-1 converted to take the V-1670 engine P-6C cancelled XP-6D