Chapter 04 vocab.txt

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Author:
Gesyca_is_joy
ID:
269261
Filename:
Chapter 04 vocab.txt
Updated:
2014-04-20 22:33:41
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CHEM 1405
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Chemistry
Description:
Basic Concepts About Matter
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  1. Chemistry
    The scientific discipline concerned with the characteristics, composition, and transformations of matter
  2. Matter
    Anything that has mass and occupies space.
  3. Solid
    The physical state characterized by a definite shape and a definite volume
  4. Liquid
    The physical state characterized by an indefinite shape and a definite volume
  5. Gas
    The physical state characterized by an indefinite shape and an indefinite volume
  6. Properties
    The distinguishing characteristics of a substance that are used in its identification and description
  7. Physical property
    A characteristic of a substance that can be observed without changing the substance into another substance
  8. Chemical property
    A characteristic of a substance that describes the way the substance undergoes or resist change to form a new substance
  9. Intensive property
    A property that is independent of the amount of substance present. For example, temperature, color, melting point, and density
  10. Extensive property
    A property that depends on the amount of substance present. For example, the mass, length, and volume
  11. Physical change
    A process in which a substance changes its physical appearance but not its chemical composition
  12. Chemical change
    A process in which a substance undergoes a change in chemical composition
  13. Chemical reaction
    A process in which at least one new substance is produced as a result of chemical change
  14. Pure substance
    A single kind of matter that cannot be separated into other kinds of matter using physical means
  15. Mixture
    A physical combination of two or more pure substances in which each substance retains its own identity. Substances are physically mixed rather than chemically combined
  16. Heterogeneous mixture
    A mixture that contains two or more visually distinguishable phases (parts), each of which has different properties
  17. Homogeneous mixture
    A mixture that contains only one visually distinguishable phase (part), which has uniform properties throughout
  18. Element
    A pure substance that cannot be broken down into simpler pure substances using ordinary chemical means such as a chemical reaction, an electric current, heat, or a beam of light
  19. Compound
    A pure substance that can be broken down into two or more simple or pure substances using chemical means
  20. Chemical symbol
    A one or two letter designation for an element derived from the elements name
  21. Chemically homogenous
    All pure substances are chemically homogenous. Only one substance can be present in a chemically homogenous material, therefore all mixtures which by definition must contain two or more substances, are never chemically homogenous
  22. Chemically heterogeneous
    Mixtures are always chemically heterogeneous because they have two or more substances. A pure substance will never be chemically heterogeneous, because, by definition of a pure substance can only contain one substance.
  23. Physically homogenous
    Describes materials consisting of only one phase (part)
  24. Physically heterogeneous
    Describes materials consisting of more than one phase (part)

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