Final answer:
A hazardous chemical is both a physical hazard and a health hazard, posing a threat to human health.
Step-by-step explanation:
Hazardous chemicals can pose a threat to human health. According to the given options, a hazardous chemical is defined as both a physical hazard and a health hazard. This means that hazardous chemicals can cause physical harm or damage to the body and also have negative effects on human health. Some examples of hazardous chemicals include certain pesticides, industrial solvents, and radioactive materials.