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Basic Concepts in General Chemistry

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Termini in questo insieme (12)

  • Element

    An element is a pure substance consisting of only one type of atom.

  • Compound

    A compound is a pure substance made of two or more different elements chemically combined in fixed proportions.

  • Mixture

    A mixture contains two or more substances physically combined, not chemically bonded.

  • Homogeneous mixture

    A homogeneous mixture has a uniform composition throughout and appears as a single phase.

  • Heterogeneous mixture

    A heterogeneous mixture has visibly different parts or phases.

  • Physical property

    A physical property can be observed or measured without changing the substance's identity.

  • Chemical property

    A chemical property describes a substance's ability to undergo a chemical change.

  • Physical change

    A physical change alters the form or appearance of a substance without changing its identity.

  • Chemical change

    A chemical change results in the formation of one or more new substances.

  • Solid

    A solid has a fixed shape and volume with particles closely packed in a rigid structure.

  • Liquid

    A liquid has a fixed volume but takes the shape of its container; particles are close but can move past each other.

  • Gas

    A gas has neither fixed shape nor volume and expands to fill its container; particles are far apart and move freely.