How many words can be used as signal words on a chemical label?

Chemical labels use signal words to communicate the level of hazard associated with the substance. The correct answer, which indicates that two words can be used as signal words, is significant because standard practices typically assign these words to indicate different levels of toxicity or hazard.

In the context of hazardous materials, signal words such as “Warning” and “Danger” are commonly employed. "Warning" generally indicates a lower level of risk, while "Danger" signifies a higher level of risk associated with the chemical. This dual approach simplifies the understanding of hazards for those handling chemicals, promoting safety and awareness.

Using just one signal word may not provide sufficient information about the level of hazard, as having two categorized signal words helps in recognizing the urgency of care required when dealing with these substances. Having more than two words would likely create confusion rather than clarity, making it less likely for individuals to understand the severity of the risk from the chemical label.