Sample answer: The order of reaction with respect to a reactant is the exponent to which the concentration of that reactant is raised in the rate law equation for the reaction Chapter 6 Opener 6.1 Qualitative and Quantitative Analysisīiocatalysts support the tenets of green chemistry because biocatalysts are generally more efficient and usually less toxic than other catalysts. Unit 3 Opener Chapter 6: Quantities in Chemical Formulas. Unit 3 Quantities in Chemical Reactions Opener.