Mole-to-Mole Ratios and Calculations of a Chemical Equation Nov 17, 2021Just to review for a moment, a mole isn't an animal. Well, it is, but not in chemistry. In chemistry, a mole is a unit of measurement, such that one mole of a substance contains 6*10 23 particles. What are Atoms & Molecules? - Definition & Differences Dec 29, 2021Atoms. Atoms are the basic building blocks from which everything around us is built. This includes the computer before you, the floor beneath you, the air you breathe, and the stars you see at night.