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  2. 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 ...

  3. Chemical substance - Wikipedia

    en.wikipedia.org/wiki/Chemical_substance

    [1] [2] Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture. [3] If a mixture is separated to isolate one chemical substance to a desired degree, the resulting substance is said to be chemically pure. [4]

  4. Chemical reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_reaction

    In a synthesis reaction, two or more simple substances combine to form a more complex substance. These reactions are in the general form: A + B AB {\displaystyle {\ce {A + B->AB}}} Two or more reactants yielding one product is another way to identify a synthesis reaction.

  5. List of purification methods in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_purification...

    Electrolysis refers to the breakdown of substances using an electric current. This removes impurities in a substance that an electric current is run through; Sublimation is the process of changing of any substance (usually on heating) from a solid to a gas (or from gas to a solid) without passing through liquid phase. In terms of purification ...

  6. Characteristic property - Wikipedia

    en.wikipedia.org/wiki/Characteristic_property

    A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample being observed is large or small. Thus, conversely, if the property of a substance changes as the sample size changes, that property is not a characteristic ...

  7. 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.

  8. Inside Demi Moore’s Oscar-nominated Substance ... - AOL

    www.aol.com/news/inside-demi-moore-oscar...

    Inside Demi Moore’s Oscar-nominated Substance transformation: 20,000 litres of ‘blood’ and 5 hours of make-up Maira Butt Updated January 27, 2025 at 2:10 AM

  9. Chemical compound - Wikipedia

    en.wikipedia.org/wiki/Chemical_compound

    Many solid chemical substances—for example many silicate minerals—are chemical substances, but do not have simple formulae reflecting chemically bonding of elements to one another in fixed ratios; even so, these crystalline substances are often called "non-stoichiometric compounds".