Identify ONE class of dry chemicals approved for use as extinguishing agent.

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Multiple Choice

Identify ONE class of dry chemicals approved for use as extinguishing agent.

Dry chemical extinguishing agents come in powder form and are made of inorganic salts. They work by interrupting the chemical reactions occurring in the flame and by coating surfaces to separate fuel from the heat and air. A common class of these powders is salts of potassium, such as potassium bicarbonate, which are widely used in ABC-type extinguishers. This is the best choice because it identifies a true dry chemical powder category. The other options are not dry chemical powders: Halon 1311 is a clean-agent gas, foam is a liquid/foam concentrate, and CO2 is a gaseous extinguishing agent.

Dry chemical extinguishing agents come in powder form and are made of inorganic salts. They work by interrupting the chemical reactions occurring in the flame and by coating surfaces to separate fuel from the heat and air. A common class of these powders is salts of potassium, such as potassium bicarbonate, which are widely used in ABC-type extinguishers. This is the best choice because it identifies a true dry chemical powder category. The other options are not dry chemical powders: Halon 1311 is a clean-agent gas, foam is a liquid/foam concentrate, and CO2 is a gaseous extinguishing agent.

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