5.1: Introduction to Reagants Reagents, not unlike solvents in the previous chapter, are the chemical materials or reactants used in a chemical conversion to product. When we think of a “reagent”, we tend to think of a chemical used in a reaction, although there are numerous examples of chemicals throughout our world that do not neatly fit that mold. Dirt, water, air, etc., can all be reagents in terms of transformations to products. 5.2: Reagant Concepts The opportunity to do chemistry by means of, for example, a fixed substrate is very much in keeping with the concepts that we are learning. We explored the functionality and power of packed-bed columns that do chemistry normally done in solution with dissolved solutes. A packed-bed reactor can provide a source of protons, ions, or other chemicals that can affect chemistry. 5.3: Specific Replacements 5.4: Conclusions and Review