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  1. Physical Change
    Produces a recognizable differnce in the appearance of a substance without causing any change in its composition or identity
  2. Chemical Reaction
    Involves the converion of one type of substance into another through a reorganization of the atoms.
  3. Elements
    a substance that cannot be decomposed into simple substances by chemical or physical means.
  4. Compound
    a substance that is characteriszed by constant composition and that can be chemically broken down into elements.
  5. Homogeneous Mixture
    a mixture of two or more substances charecterized by uniform composition.
  6. Heterogeneous Mixture
    a mixture of two or more substances characterized by nonuniform composition.
  7. Atom
    Smallest Unit of an element that retains the properties of that element.
  8. Nucleus
    the small dense center of a positive vharge in the atom.
  9. Ion
    an electrically charged particles formed by the gain or loss of electrons.
  10. Cation
    a positively charged atom or group of atoms
  11. Anion
    a negatively charged atom or group of atoms
  12. Period
    any one of 7 horizantal rows of elements in the periodic table
  13. Group
    any one of 18 vertical columns of elements: often referred to as a "family"
  14. Atomic orbital
    a specific region of space where an electron may be found.
  15. Electron Configuration
    the arrangement of electrons around the nucleus of an atom an ion, or collection of nuclei of a molecule.
  16. Valence Electron
    Electron in the outer most shell (principal quantum level) of an atom.
  17. 3 states of matter
    1. a GAS will expand to fill any container; it has no definite volume or shape.

    2. a LIQUID has a definite shape; it takes on the shape of its container.

    3. a SOLID has both a fixed volume and a fixed shape.
Card Set
Unit 2
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