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Hazard Predictions

• Explosive: Reaction products may be explosive or sensitive to shock or friction
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive

Alkali metals' intense reactions with rather weak reducing agents as described below indicate that they may also react vigorously with stronger reducing agents as well.

Sodium may react explosively with powdered carbon or sulfur (Dickinson, F. 1961. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 2, Supplement 2. pp. 466-467, 454-455. Longmans, Green and Co Ltd.).

Potassium reacts exothermically with carbon (Dickinson, F. 1963. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 2, Supplement 3, pp. 1566. Longmans, Green and Co Ltd.).

Sodium forms shock-sensitive compounds with carbon monoxide (Weiss, E. 1993. Agnew. Chem. (International Ed.) 32(11):1518).

Reaction between lithium and sulfur is very violent if either is in the liquid phase (Dickinson, F. 1961. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 2, Supp. 2, p 75. Longmans, Green and Co Ltd.).

Liquid sodium may ignite or explode on contact with PCl3 (Mellor, J.W. 1940. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 8, pp. 1016. Longmans, Green and Co Ltd.; Mellor, J.W. 1941. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 2, pp. 470. Longmans, Green and Co Ltd.).

Potassium ignites on contact with PCl3 (Mellor, J.W. 1940. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 8, pp. 1006. Longmans, Green and Co Ltd.).

Potassium reacts exothermically with selenium (Mellor, J.W. 1947. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 10, pp. 767. Longmans, Green and Co Ltd.; Mellor, J.W. 1943. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Volume 11, pp. 40. Longmans, Green and Co Ltd.).