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Which represents an endothermic reaction?
wood burning in a fire
splitting a gas molecule
using a heat pack on an injury
TNT exploding
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Splitting a gas molecule.
Breaking chemical bonds (for example splitting H2O into H2 and O2 by electrolysis) requires an input of energy, so the process is endothermic. The others (wood burning, a heat pack releasing warmth, TNT exploding) release heat and are exothermic.
Breaking chemical bonds (for example splitting H2O into H2 and O2 by electrolysis) requires an input of energy, so the process is endothermic. The others (wood burning, a heat pack releasing warmth, TNT exploding) release heat and are exothermic.
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