ACS Laboratory Safety Practice Test 2025 – Comprehensive Exam Prep

Question: 1 / 400

What is the CAS registry number?

A code used for chemical identification

The CAS registry number is a unique numerical identifier assigned to every chemical substance described in the open scientific literature. It serves as a standardized way to identify chemicals, allowing researchers and professionals to unambiguously reference specific substances without the confusion that might arise from differing names or synonyms. This system, maintained by the Chemical Abstracts Service, is crucial for ensuring consistency in communication about chemicals among scientists and regulatory bodies. While options relating to toxicity measurements, exposure thresholds, or classifications of hazardous materials address important safety considerations, they do not pertain directly to the purpose of the CAS registry number, which is solely focused on the identification of chemical substances.

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A unit of measure for toxicity

A safety threshold for exposure

A classification for hazardous materials

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