Compound - Pure substance with unique properties; Formed when two or more different elements combine

Covalent Bond - A type of chemical bond formed when atoms share electrons

Molecule - A compound whose atoms are held together by covalent bonds

Polar Molecule - Molecule with oppositely charged regions

Hydrogen Bond - Weak electrostatic bond formed by the attraction of opposite charges between a hydrogen  atom and an oxygen, fluorine, or nitrogen atom

Cohesion - Attraction of molecule for other molecules of the same kind

Adhesion - Hydrogen forms bonds with molecules on other surfaces

Solution - A homogeneous mixture formed when a substance (the solute) is dissolved in another substance (the salvent)

Suspension - Heterogeneous mixture of two or more substances

Acid - Substance that makes Hydrogenions (H^4) when dissolved in water, an acid solution has a pH less than 7

Base - Substance that releases Hydroxide ions (OH-) when dissolved in water: a basic solution has a pH greater than 7