Find out the definition of a chain reaction, what the symbol for helium is, the speed of light equation, and more chemistry-based terms with this invaluable 3-panel (6-page)?guide. All terms are up-to-date and listed in alphabetical order for easy reference; full-color images are also included that highlight specific information. No laboratory should be without one! Terms covered include: . Absolute Zero . Balanced Equation . Catalyst . Dalton's Law . Enzyme . Fusion . . . . and more!