Chemistry

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.

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.