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  2. Methylidynephosphane - Wikipedia

    en.wikipedia.org/wiki/Methylidynephosphane

    Methylidynephosphane (phosphaethyne) is a chemical compound which was the first phosphaalkyne compound discovered, containing the unusual C≡P carbon-phosphorus triple bond. Although isolated samples of methylidynephosphane are impractical, other derivatives have been well studied such as tert-butylphosphaacetylene.

  3. List of chemical databases - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_databases

    Chemexper Chemical Directory catalogue chemicals CASno Structure SMILES "ChemExper". Chemxpert Database Chemxpert Chemical Database small molecules database buyers,suppliers "ChemxpertDB". 10,00000 Chemical Book East West University: commercially available compounds CASno, suppliers, properties "Chemical Book". 200,000 Chemical Register

  4. Glossary of chemistry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemistry_terms

    The ligand is usually an organic compound called a chelant or chelating agent. chemical See chemical species and chemical compound. chemical bond See bond. chemical composition The identity and relative number of the elements that make up a chemical compound, which can often be expressed with a chemical formula. chemical compound See compound.

  5. Mass spectral interpretation - Wikipedia

    en.wikipedia.org/wiki/Mass_spectral_interpretation

    Even when compounds only contain elements with less intense isotope peaks (carbon or oxygen), the distribution of these peaks can be used to assign the spectrum to the correct compound. For example, two compounds with identical mass of 150 Da, C 8 H 12 N 3 + and C 9 H 10 O 2 + , will have two different M+2 intensities which makes it possible to ...

  6. Mass spectrometry - Wikipedia

    en.wikipedia.org/wiki/Mass_spectrometry

    A mass spectrum is a type of plot of the ion signal as a function of the mass-to-charge ratio. These spectra are used to determine the elemental or isotopic signature of a sample, the masses of particles and of molecules, and to elucidate the chemical identity or structure of molecules and other chemical compounds. Discovery of Neon Isotopes

  7. METAR - Wikipedia

    en.wikipedia.org/wiki/METAR

    METAR indicates that the following is a standard hourly observation. KTTN is the ICAO identifier for the Trenton-Mercer Airport . 051853Z indicates the day of the month is the 5th and the time of day is 1853 Zulu/ UTC , or 1:53PM Eastern Standard Time .

  8. Molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Molecular_geometry

    A pure substance is composed of only one type of isomer of a molecule (all have the same geometrical structure). Structural isomers have the same chemical formula but different physical arrangements, often forming alternate molecular geometries with very different properties. The atoms are not bonded (connected) together in the same orders.

  9. Mass (mass spectrometry) - Wikipedia

    en.wikipedia.org/wiki/Mass_(mass_spectrometry)

    Theoretical isotope distribution for the molecular ion of caffeine. The molecular mass (abbreviated M r) of a substance, formerly also called molecular weight and abbreviated as MW, is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of 12 C).