Review definition of pure substance. Elicit a definition of a mixture including the definition of a pure substance. Determine that substances can be separated by physical means, and discuss mixtures of iron and sulfur along with mercury and silver. Arrive at a definition for a homogenous mixture, and review solute and solvent terms, miscible and miscible, and soluble and insoluble. List and discuss the 6 major types of homogenous mixtures.