chemistry of hazardous materials

Question 1. Why is the spillage of liquid oxygen upon asphalt pavement potentially hazardous? Question 2.The DOT regulation at 49 CFR 174.450 previously stipulated that when fire occurs in a domestic rail shipment of charcoal in transit, water should notbe used if it is practicable to locate and remove the burning charcoal. Any charcoal that becomes wet while a fire is being extinguished must be removed from the carand not reshipped, and the remaining charcoal must be held under observation in a dry place for at least 5 days before forwarding. What is the most likely reasonDOT regulates the domestic transportation of charcoal in this fashion? What chemical reaction is involved here?

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