The Zimbabwe Secondary School Science Project (ZIM-SCI) developed student study guides, corresponding teaching guides, and science kits for a low-cost science course which could be taught during the first 2 years of secondary school without the aid of qualified teachers and conventional laboratories. This teaching guide, designed to be read in conjunction with the related student guide, includes instructional strategies, lists of required materials, laboratory procedures, and other information for activities and experiments in a three-part unit in which students: (1) examine the nature, properties, and potability of water; (2) mix substances which produce solutions and suspensions; and (3) examine the solubility of substances and the rate at which they dissolve, prepare saturated solutions, and separate liquid mixtures. Each section in this guide corresponds to a given section in the student study guide. (JN)