Which of the following chemical markings are commonly found on transport vehicles carrying hazardous materials?

• A. UN numbers and hazard class labels
• B. Lewis dot structures
• C. Periodic table symbols
• D. Molecular weight values

Answer: (A)

Verified step by step guidance

1. Understand that transport vehicles carrying hazardous materials must display specific markings to communicate the nature of the hazards to emergency responders and the public.
2. Recognize that UN numbers are four-digit numbers assigned by the United Nations to identify hazardous substances and articles during transport. These numbers provide a standardized way to identify the material.
3. Know that hazard class labels are pictograms or symbols that indicate the type of hazard (e.g., flammable, toxic, corrosive) associated with the material being transported.
4. Identify that Lewis dot structures, periodic table symbols, and molecular weight values are chemical representations or data used in chemistry but are not used as transport markings for hazardous materials.
5. Conclude that the markings commonly found on transport vehicles carrying hazardous materials are UN numbers and hazard class labels, as these provide essential safety information during transport.