Pure Substances & Mixtures
heterogeneous mixture
a combination of substances in which different components are easily observed
homogeneous mixture
a combination of substances in which the appearance and properties are the same throughout
molecule
a combination of two or more atoms that are combined in a definite ratio
mixture
a combination of two or more substances that are not chemically combined
solution
a mixture that appears to be a single substance but is composed of particles of two or more substances that are distributed evenly amongst each other
pure substance
a substance in which there is only one type of particle; includes elements and compounds
chemical formula
code that uses chemical symbols and subscripts to identify the types and numbers of atoms in a compound
compound
combination of substances (elements) that are chemically combined (bonded)
coefficient
in a chemical formula, the large number in front that tells how many molecules are present
subscript
in a chemical formula, the small number that identifies how many atoms of each type are in a molecule
law of conservation of matter
matter cannot be created or destroyed, it can only change from one form to another
chemical symbol
one or two letter code that represents an element; derived from the Latin name for an element
solvent
the substance in which a solute is dissolved to form a solution
solute
the substance that is dissolved to form a solution
reactant
the substances that exist before a reaction occurs (ingredients)
product
the substances that remain after a reaction takes place (resulting molecules)