The Permissible Exposure Levels (PELs) for 4 chemicals are provided below. Which of these presents that greatest hazard?

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The question asks: The Permissible Exposure Levels (PELs) for 4 chemicals are provided below. Which of these presents that greatest hazard?

First, note that we are told the correct answer is Carbon tetrachloride (10 ppm), but the answer options themselves are not provided in the data (answer_options is null). This means we cannot perform a complete comparison across all four chemicals based on PELs alone from the given information.

Key point about PELs and hazard: A PEL is a regulatory exposure limit. A lower PEL often indicates stricter control due to higher potential harm at lower concentrations, but the hazard is not determined solely by the numerical PEL value. The intrinsic hazard of a chemical depends on its toxicological properties (e.g., acute toxicity, chronic toxicity, carcinogenicity, organ toxicity) and how readily exposure translates into adverse effects, as well as factors like exposure duration and routes.

Option analysis context (hypothetical since other options are not provided):
- If Carbon tetrachloride has a PEL of 10 ppm, and this is the lowest PEL among the four chemicals, it could suggest a higher regulatory concern for that chemical, potentially reflecting greater toxicity. However, a lower PEL does not automatically prove greater hazard in all contexts, because some chemicals may have lower PELs due to specific exposure scenarios, detection challenges, or historical testing results rather than universal hazard superiority.
- Without knowing the PELs or toxic profiles of the other three chemicals, we cannot definitively rank hazard across all four substances.

Considerations that would help make a more informed judgment if the full data were available:
- Compare the intrinsic toxicities: hepatotoxicity, neurotoxicity, nephrotoxicity, carcinogenic potential, and acute lethality.
- Examine exposure scenarios: typical workplace exposure routes (inhalation, dermal), durations (short-term vs. chronic), and potential for bioaccumulation.
- Evaluate the regulatory context: PELs are regulatory limits that may be influenced by feasibility of measurement and control technologies, not just hazard alone.

Given the missing parallel data (the other three chemicals and their PELs), the reasoning cannot fully determine which chemical presents the greatest hazard based solely on the provided one option. The presented answer, Carbon tetrachloride (10 ppm), would require a complete comparison with the remaining chemicals to substantiate it as the greatest hazard in this set.

W25 CHEM D012A 53, 54 Organic Chemistry I Safety Quiz (ACS Youtube videos)

The Permissible Exposure Levels (PELs) for 4 chemicals are provided below. Which of these presents that greatest hazard?

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