What potential danger does a WHMIS classified material that reacts with water pose?

A material classified under the Workplace Hazardous Materials Information System (WHMIS) that reacts with water can pose significant dangers, particularly the potential to release toxic gases. When these materials come into contact with water, they can undergo chemical reactions that produce harmful by-products, such as toxic gases or fumes, which can be hazardous to health if inhaled.

Understanding the specific reactions and their by-products is crucial for safety in handling and storage. For instance, certain alkali metals and some metal hydrides are known to produce flammable and toxic gases upon contact with water. This makes proper labeling and understanding of WHMIS classifications vital in preventing accidents and ensuring safe workplace practices.

The other options do not correctly address the seriousness of the hazards associated with materials that can react with water. Stating that there is "no significant danger" or that the material is "safe for all environments" underestimates the risks involved. Although the production of flammable vapors may occur, the primary concern with reactive materials and water is the release of toxic gases, making the third choice the most accurate reflection of the potential dangers.