• EXOTHERMIC: Heat is Released

• ENDOTHERMIC: Heat is Absorbed

• THERMAL ENERGY: Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.

Density measures the mass of an object or substance compared to its volume

MIXTURES:  a combination of two or more pure substances in which each pure substance retains its individual chemical properties. Mixtures can be composed of solids, liquids, or gases.

SOLUTIONS: a homogeneous mixture of two or more substances. A solution may exist in any phase. A solution consists of a solute and a solvent. The solute is the substance that is dissolved in the solvent.