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Videos de Conceptos Relacionados

Elements and Compounds01:27

Elements and Compounds

Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.ElementsElements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Essential Minerals for Bone Health

The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Fineness Modulus01:19

Fineness Modulus

The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
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Analysis of Minerals Produced by hFOB 1.19 and Saos-2 Cells Using Transmission Electron Microscopy with Energy Dispersive X-ray Microanalysis
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Un componente meteorítico rico en elementos volátiles: su caracterización e implicaciones.

R Ganapathy, J W Larimer

    Science (New York, N.Y.)
    |January 4, 1980
    PubMed
    Resumen

    Un material único rico en carbono en el meteorito Abee muestra un enriquecimiento extremo en elementos volátiles. Este descubrimiento puede explicar la inusual abundancia de elementos como el mercurio en los meteoritos, ofreciendo información sobre los procesos de la nebulosa solar.

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    Área de la Ciencia:

    • Cosmoquímica es la cosmoquímica.
    • Ciencias planetarias Ciencias planetarias.
    • La meteorítica es la meteorología.

    Sus antecedentes:

    • Los meteoritos proporcionan información crucial sobre la composición y los procesos del sistema solar temprano.
    • Comprender las abundancias elementales en los meteoritos ayuda a reconstruir las condiciones de la formación de planetas.

    Objetivo del estudio:

    • Para investigar la composición de un inusual material rico en carbono dentro del meteorito Abee.
    • Para determinar los factores de enriquecimiento de los elementos volátiles y no volátiles en este material.
    • Explorar las implicaciones de estos hallazgos para la química de la nebulosa solar y la composición de los meteoritos.

    Principales métodos:

    • Análisis de las inclusiones ricas en carbono del meteorito Abee.
    • Cuantificación de las abundancias elementales, centrándose en los elementos volátiles y no volátiles.
    • Comparación de los factores de enriquecimiento observados con modelos de los procesos de la nebulosa solar.

    Principales resultados:

    • El material rico en carbono está altamente enriquecido en elementos volátiles (hasta 10^4 veces) en comparación con los elementos no volátiles.
    • Se observó un factor de enriquecimiento de mercurio de 8500.
    • Este patrón de enriquecimiento sugiere la formación tardía en la nebulosa solar de polvo residual.

    Conclusiones:

    • El meteorito Abee contiene un componente único, rico en volátiles, formado bajo condiciones específicas de la nebulosa solar.
    • La composición de este material proporciona una explicación potencial para la alta abundancia de mercurio y otros elementos volátiles en ciertos meteoritos.
    • Los hallazgos apoyan los modelos de acreción en etapa tardía en la nebulosa solar que involucra polvo residual.