Chromatography is a process by which mixtures can be separated or substances can be purified. Biological and chemical laboratories use many different types of chromatographic processes. For example, the pharmaceutical industry uses chromatographic techniques to purify drugs, medical labs use them to identify blood components such as cholesterol,…

Introduces and describes the Laboratory Procedure Module (LPM) modified from a task analysis approach used by laboratory technical training programs based on instructional system design model. Overviews the LPM design, including primary goal, enabling objectives, task steps, overview, demonstration, written test, practice, and procedural…

Offers challenging work at a higher level of technique than most students meet in elementary laboratory work. Uses a combined weight and volumetric sequence not shown in textbooks. Notes modern rapid balances help lower evaporation loss during weighings. Discusses the balance, weights, and buoyancy considerations. (MVL)

Notes that this experiment takes safety and noncarcinogenic reactants into account. Demonstrates the use of diazonium salts for the replacement of an aromatic amine group by a phenolic hydroxyl. Involves two pleasant-smelling organic compounds, methyl anthranilate (grape) and methyl salicylate (oil of wintergreen). (MVL)

Describes a circuit by which capacitance and the dielectric constant can be measured. Shows the circuit diagram and the method to calculate these constants. (YP)

Outlines some strategies used by science teacher educators to train teachers to make laboratory lessons a place for meaningful and useful learning, including content analysis of laboratory manuals, scientific inquiry, flexible organization, concept mapping, Vee heuristics, and inquiry oriented laboratory tests. (YP)