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  2. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Download as PDF; Printable version ... This article needs attention from an expert in chemistry. ... "First 25 of 125 big questions that face scientific inquiry over ...

  3. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

  4. HSAB theory - Wikipedia

    en.wikipedia.org/wiki/HSAB_theory

    HSAB is an acronym for "hard and soft (Lewis) acids and bases".HSAB is widely used in chemistry for explaining the stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.

  5. File:High School Chemistry.pdf - Wikipedia

    en.wikipedia.org/wiki/File:High_School_Chemistry.pdf

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  6. List of chemical compounds with unusual names - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_compounds...

    Chemical nomenclature, replete as it is with compounds with very complex names, is a repository for some names that may be considered unusual. A browse through the Physical Constants of Organic Compounds in the CRC Handbook of Chemistry and Physics (a fundamental resource) will reveal not just the whimsical work of chemists, but the sometimes peculiar compound names that occur as the ...

  7. 49ers suspend De'Vondre Campbell for refusing to enter game ...

    www.aol.com/report-49ers-suspend-devondre...

    The San Francisco 49ers on Monday suspended linebacker De'Vondre Campbell for the final three games of the regular season for refusing to play Thursday night against the Los Angeles Rams.. Niners ...

  8. List of unsolved problems in fair division - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    NOTE: the following related problems are known to be computationally hard: Calculating the 1-of-MMS of a given agent is NP-hard even if all agents have additive preferences (reduction from partition problem). Deciding whether a given allocation is 1-of-MMS is co-NP complete for agents with additive preferences.

  9. The best gifts to buy your grandkids — from babies to big ...

    www.aol.com/lifestyle/the-best-gifts-to-buy-your...

    I'm not a grandparent myself, but I've watched plenty of parents, including my own, turn into grandparents, and boy, does it look like a lot of fun.