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  1. A compound contains atoms of different elements chemically combined together in a fixed ratio. A mixture is a combination of two or more substances where there is no chemical combination or reaction. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.

  2. close. compound A pure substance made from two or more elements which are chemically bonded in a fixed ratio. and. mixtures. close. mixture When two or more compounds or elements are present ...

  3. Jun 22, 2020 · A molecule is made whenever two or more atoms form chemical bonds, while a compound occurs whenever two or more different atoms form chemical bonds. Under this narrow definition, oxygen and hydrogen are molecules but not compounds. Water is both a molecule and a compound. Why Water Is not a Mixture. Another common question is whether water is a ...

  4. Aug 23, 2019 · A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous. Elements and compounds are both examples of pure substances.

  5. Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different ...

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  7. This means a lot of phases made of molecules (like H2O) are considered compounds (though H2 is not). While in mixtures proportions of constituents are highly variable, in compounds they are not. If a compound is molecular, all it's molecules are virtually identical (this doesn't account for different isotopes, or molecular conformations).

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