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Produces a recognizable differnce in the appearance of a substance without causing any change in its composition or identity
Involves the converion of one type of substance into another through a reorganization of the atoms.
a substance that cannot be decomposed into simple substances by chemical or physical means.
a substance that is characteriszed by constant composition and that can be chemically broken down into elements.
a mixture of two or more substances charecterized by uniform composition.
a mixture of two or more substances characterized by nonuniform composition.
Smallest Unit of an element that retains the properties of that element.
the small dense center of a positive vharge in the atom.
an electrically charged particles formed by the gain or loss of electrons.
a positively charged atom or group of atoms
a negatively charged atom or group of atoms
any one of 7 horizantal rows of elements in the periodic table
any one of 18 vertical columns of elements: often referred to as a "family"
a specific region of space where an electron may be found.
the arrangement of electrons around the nucleus of an atom an ion, or collection of nuclei of a molecule.
Electron in the outer most shell (principal quantum level) of an atom.
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.