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  2. Comparison of YouTube downloaders - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_YouTube_down...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  3. List of unsolved problems in chemistry - Wikipedia

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    This article needs attention from an expert in chemistry. The specific problem is: Incomplete list. WikiProject Chemistry may be able to help recruit an expert.

  4. Salt (chemistry) - Wikipedia

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

    In chemistry, a salt or ionic compound is a chemical compound consisting of an assembly of positively charged ions and negatively charged ions , [1] which results in a compound with no net electric charge (electrically neutral). The constituent ions are held together by electrostatic forces termed ionic bonds.

  5. Molecular diffusion - Wikipedia

    en.wikipedia.org/wiki/Molecular_diffusion

    Diffusion is of fundamental importance in many disciplines of physics, chemistry, and biology. Some example applications of diffusion: Sintering to produce solid materials (powder metallurgy, production of ceramics) Chemical reactor design; Catalyst design in chemical industry; Steel can be diffused (e.g., with carbon or nitrogen) to modify its ...

  6. Ion - Wikipedia

    en.wikipedia.org/wiki/Ion

    The net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons. A cation is a positively charged ion with fewer electrons than protons [ 2 ] (e.g. K + (potassium ion)) while an anion is a negatively charged ion with more electrons than protons.