Compounds/Gram Formula/Percent Composition

Heterogeneous
Materials composed of two or more phases wich are separated by definite boundaries called interfaces.
Mixture
Any material composed of two or more kinds of matter, each keeping its own characteristic properties, can be mixed in varying proportions and can be separated by mechanical means.
Homogeneous
Those materials which are uniform in composition, each part has identical properties, and consists of a single phase.
Element
Substances composed of only one kind of atom and cannot be further deocomposed by ordinary chemical means.
Atom
The smallest unit of an element that can enter into combination with other elements.
Molecule
The smallest part of a compound with all the properties of the compound.
Ion
an atom or group of atoms which possesses an overall electrical charge by gaining or losing electrons.
Polyatomic Ion (Radical)
When two or more atoms are chemically bonded and possesses an electrical charge.
Acid
Compounds with have hydrogen as the only positive part of the compound.
Base
Compounds which have Hydroxide as their only negative part.
Oxide
Compounds which have oxygen as their only negative part.
Salts
All compounds which are not acids, bases, or oxides.
Gram Formula Mass
The sum of the gram atomic masses of the moles of the atoms in one mold of formula units of a substance.
Percent Composition=
total mass of element (or H2O)/ gfm *100%
Hydrate
A crystal which contains water of hydration.
Anhydrous Salt
The salt that is left when the water is evaporated from the hydrate.