Which factors can vary the degree of toxicity?

Which factors can vary the degree of toxicity?

• A. Color and odor
• B. Storage temperature
• C. Health, body weight, age, type of material, and route of exposure
• D. Only the chemical's pH

Answer: (C)

Toxicity isn’t fixed for a chemical—how toxic it is depends on who is exposed and how they’re exposed. The best answer reflects that variability: a person’s health status, body weight, and age can change how their body absorbs, distributes, metabolizes, and eliminates a toxic substance. The inherent properties of the material (how toxic it is in general) also matter, and the route of exposure (inhalation, ingestion, skin contact) determines how much of the substance enters the body and where it acts. Color and odor don’t indicate how toxic a substance is; they’re just clues that a substance is present. Storage temperature can affect stability or the rate of a reaction, which may influence exposure risk, but it doesn’t change the chemical’s toxicity itself. pH can influence properties for some substances, but it does not determine the degree of toxicity across the board.

Toxicity isn’t fixed for a chemical—how toxic it is depends on who is exposed and how they’re exposed. The best answer reflects that variability: a person’s health status, body weight, and age can change how their body absorbs, distributes, metabolizes, and eliminates a toxic substance. The inherent properties of the material (how toxic it is in general) also matter, and the route of exposure (inhalation, ingestion, skin contact) determines how much of the substance enters the body and where it acts.

Color and odor don’t indicate how toxic a substance is; they’re just clues that a substance is present. Storage temperature can affect stability or the rate of a reaction, which may influence exposure risk, but it doesn’t change the chemical’s toxicity itself. pH can influence properties for some substances, but it does not determine the degree of toxicity across the board.