Chemical storage should be organized according to which criterion?

• A. Chemical properties
• B. Hazard class
• C. Date received
• D. Size

Answer: (A)

Grouping chemicals by chemical properties ensures incompatible substances are stored apart and that each item’s specific storage needs are met. The way a substance behaves—its reactivity, flammability, oxidizing or reducing nature, moisture sensitivity, and corrosion potential—dictates what it can be stored with and under what conditions (temperature, ventilation, containment). For example, acids should be segregated from bases, oxidizers kept away from fuels or organics, and moisture-sensitive reagents stored in tightly closed containers in appropriate environments. While hazard class informs risk communication, the primary way to prevent dangerous interactions is to organize by how substances behave chemically, so that their compatibility and storage requirements are respected. Date received and size don’t impact chemical interactions or storage safety, and while hazard classification can guide labeling, it doesn’t provide the direct guidance needed to prevent incompatibilities.