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  2. OpenSciEd - Wikipedia

    en.wikipedia.org/wiki/OpenSciEd

    OpenSciEd's approach is based on a science storyline, where students build upon their understanding of a topic by asking questions and investigating their answers through various activities. [2] It has been adopted by 10 states. [3] All materials are reviewed by and follow Next Generation Science Standards. [4] [5]

  3. Elemental analysis - Wikipedia

    en.wikipedia.org/wiki/Elemental_analysis

    Modern simultaneous CHNS combustion analyzer. Elemental analysis is a process where a sample of some material (e.g., soil, waste or drinking water, bodily fluids, minerals, chemical compounds) is analyzed for its elemental and sometimes isotopic composition.

  4. Formaldehyde - Wikipedia

    en.wikipedia.org/wiki/Formaldehyde

    Formaldehyde appears to be a useful probe in astrochemistry due to prominence of the 1 10 ←1 11 and 2 11 ←2 12 K-doublet transitions. It was the first polyatomic organic molecule detected in the interstellar medium. [29] Since its initial detection in 1969, it has been observed in many regions of the galaxy.

  5. Radioactive decay - Wikipedia

    en.wikipedia.org/wiki/Radioactive_decay

    Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation.

  6. General chemistry - Wikipedia

    en.wikipedia.org/wiki/General_chemistry

    General chemistry professors have been known to make tests worth a large portion of the course, and make them more challenging than the material presents itself as. Grade deflation, purposely adjusting the grades of a course to be lower, is also an issue of general chemistry courses at the undergraduate level.

  7. Arsenic - Wikipedia

    en.wikipedia.org/wiki/Arsenic

    [44] [45] [46] Cacodylic acid, which is of historic and practical interest, arises from the methylation of arsenic trioxide, a reaction that has no analogy in phosphorus chemistry. Cacodyl was the first organometallic compound known (even though arsenic is not a true metal) and was named from the Greek κακωδία "stink" for its offensive ...

  8. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The Millennium Prize Problems are seven well-known complex mathematical problems selected by the Clay Mathematics Institute in 2000. The Clay Institute has pledged a US $1 million prize for the first correct solution to each problem.

  9. Meiosis - Wikipedia

    en.wikipedia.org/wiki/Meiosis

    This is an accepted version of this page This is the latest accepted revision, reviewed on 24 January 2025. Cell division producing haploid gametes For the figure of speech, see Meiosis (figure of speech). For the process whereby cell nuclei divide to produce two copies of themselves, see Mitosis. For excessive constriction of the pupils, see Miosis. For the parasitic infestation, see Myiasis ...