◆ We begiwith a brief introductioto the study of chemistry and describe its role iour modersociety. (1.1 and 1.2)

◆ Next, we learthe basic SI units and use the SIderived units for quantities like volume and density. (1.3)

◆ We become familiar with the significant figures. Icalculations or measurements, every quantity must show the proper number of significant figures, which are the meaningful digits.

◆ We study the four major types of concentratiounits—percent by mass, mole fraction, molarity, and their interconversions.