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Hazard Predictions

• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive

Many anhydrides are oxidants, and therefore react vigorously with alkali metals, which are strong reducing agents. Specific examples follow:

The interaction of selenium and chromium trioxide is violent (Mellor, J. 1943. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 11, p. 233. Longmans, Green and Co Ltd.).

Dinitrogen pentaoxide vigorously oxidizes arsenic (Mellor, J. 1940. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 8, p. 554. Longmans, Green and Co Ltd.).

Maleic anhydride is explosively decomposed by alkali metals (MCA Safety Data Sheet 88, Manufacturing Chemists' Association, Washington, 1962). Alkali earth metals may react in a similar way.

Tetraphosphorus decoxide reacts explosively with warm calcium (Mellor, J. 1940. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 8, p. 945. Longmans, Green and Co Ltd.).

Potential Gas Byproducts

• Hydrogen (H2)