If only some of the substances that make up a chemical have been tested for hazards, what can be assumed about the chemical?

The correct choice signifies that in the absence of comprehensive testing on all components within a chemical mixture, the hazards associated with each individual substance can still impact the safety assessment of the entire mixture. In cases where some substances are known to be hazardous, it is prudent to assume that the mixture may also possess similar risks due to the potential interactions and cumulative effects of those components.

Chemical mixtures can exhibit properties that are different from those of their individual substances. Thus, if some components are identified as hazardous, there is a reasonable basis for considering that the entire mixture may present hazards as well. This highlights the importance of hazard communication and safety protocols in handling chemicals to ensure adequate precautions are taken even when complete toxicity data are unavailable. Therefore, without full testing, recognizing that hazards of specific components could affect the entire mixture reflects a cautious and responsible approach to chemical safety.