A thermite reaction is thermodynamically spontaneous, and because it is associated with a significant release of heat, it is regarded as what?

• Correct Answer: endothermic
• biochemical
• endotropic
• exothermic

Explanation: Thermodynamic spontaneity. The highly exothermic and dramatic thermite reaction is thermodynamically spontaneous. Reactants of aluminum and a metal oxide, usually iron, which are stable at room temperature, are ignited either in the presence of heat or by the reaction of potassium permanganate and glycerin. The resulting products are aluminum oxide, free and molten elemental metal, and a great deal of heat, which makes this an excellent method for on-site welding. Because this reaction has its own oxygen supply, it can be used for underwater welding as well.

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