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  2. Hertz–Knudsen equation - Wikipedia

    en.wikipedia.org/wiki/Hertz–Knudsen_equation

    The Hertz–Knudsen equation describes the non-dissociative adsorption of a gas molecule on a surface by expressing the variation of the number of molecules impacting on the surfaces per unit of time as a function of the pressure of the gas and other parameters which characterise both the gas phase molecule and the surface: [1] [2]

  3. Cross-coupling reaction - Wikipedia

    en.wikipedia.org/wiki/Cross-coupling_reaction

    In organic chemistry, a cross-coupling reaction is a reaction where two different fragments are joined. Cross-couplings are a subset of the more general coupling reactions. Often cross-coupling reactions require metal catalyst

  4. Quantitative analysis (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Quantitative_analysis...

    Once the presence of certain substances in a sample is known, the study of their absolute or relative abundance could help in determining specific properties. Knowing the composition of a sample is very important, and several ways have been developed to make it possible, like gravimetric [3] and volumetric analysis. Gravimetric analysis yields ...

  5. Chemistry - Wikipedia

    en.wikipedia.org/wiki/Chemistry

    Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

  6. Chemical reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_reaction

    Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur. The substance (or substances) initially involved in a chemical reaction are called reactants or reagents.

  7. Dying To Be Free - The Huffington Post

    projects.huffingtonpost.com/dying-to-be-free...

    Chemistry, not moral failing, accounts for the brain’s unwinding. In the laboratories that study drug addiction, researchers have found that the brain becomes conditioned by the repeated dopamine rush caused by heroin. “The brain is not designed to handle it,” said Dr. Ruben Baler, a scientist with the National Institute on Drug Abuse.

  8. Separation process - Wikipedia

    en.wikipedia.org/wiki/Separation_process

    Analytical chemistry – Study of the separation, identification, and quantification of matter; Chemical process – A method or means of somehow changing one or more chemicals or chemical compounds. High-performance liquid chromatography – Technique in analytical chemistry; Unit operation – Basic step in a process

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    SYSTEM REQUIREMENTS. Mobile and desktop browsers: Works best with the latest version of Chrome, Edge, FireFox and Safari. Windows: Windows 7 and newer Mac: MacOS X and newer Note: Ad-Free AOL Mail ...