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  2. Chemical substance - Wikipedia

    en.wikipedia.org/wiki/Chemical_substance

    The resulting compound has all the properties of a chemical substance and is not a mixture. Iron(II) sulfide has its own distinct properties such as melting point and solubility , and the two elements cannot be separated using normal mechanical processes; a magnet will be unable to recover the iron, since there is no metallic iron present in ...

  3. Mixture - Wikipedia

    en.wikipedia.org/wiki/Mixture

    A diagram representing at the microscopic level the differences between homogeneous mixtures, heterogeneous mixtures, compounds, and elements. Mixtures can be either homogeneous or heterogeneous: a mixture of uniform composition and in which all components are in the same phase, such as salt in water, is called homogeneous, whereas a mixture of ...

  4. Chemical compound - Wikipedia

    en.wikipedia.org/wiki/Chemical_compound

    A chemical compound is a chemical substance composed of many identical molecules ... Globally, more than 350,000 chemical compounds (including mixtures of chemicals ...

  5. Separation process - Wikipedia

    en.wikipedia.org/wiki/Separation_process

    A separation process is a method that converts a mixture or a solution of chemical substances into two or more distinct product mixtures, [1] a scientific process of separating two or more substances in order to obtain purity. At least one product mixture from the separation is enriched in one or more of the source mixture's constituents.

  6. Chemical composition - Wikipedia

    en.wikipedia.org/wiki/Chemical_composition

    The chemical composition of a mixture can be defined as the distribution of the individual substances that constitute the mixture, called "components". In other words, it is equivalent to quantifying the concentration of each component. Because there are different ways to define the concentration of a component, there are also different ways to ...

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  8. Solution (chemistry) - Wikipedia

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

    Making a saline water solution by dissolving table salt in water.The salt is the solute and the water the solvent. In chemistry, a solution is defined by IUPAC as "A liquid or solid phase containing more than one substance, when for convenience one (or more) substance, which is called the solvent, is treated differently from the other substances, which are called solutes.

  9. Paper chromatography - Wikipedia

    en.wikipedia.org/wiki/Paper_chromatography

    For example, if a compound travels 9.9 cm and the solvent front travels 12.7 cm, the R ƒ value = (9.9/12.7) = 0.779 or 0.78. R ƒ value depends on temperature and the solvent used in experiment, so several solvents offer several R ƒ values for the same mixture of compound. A solvent in chromatography is the liquid the paper is placed in, and ...

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