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Enthalpy Changes

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Chemical Reaction (Exothermic)

Exothermic reaction, enthalpy decreases ( $riangle H<0$ ).

Sublimation

Endothermic process, enthalpy increases ( $riangle H>0$ ).

Melting (Fusion)

Endothermic process, enthalpy increases ( $riangle H>0$ ).

Freezing

Exothermic process, enthalpy decreases ( $riangle H<0$ ).

Combustion

Typically exothermic, enthalpy decreases ( $riangle H<0$ ).

Formation Reaction

Can be exothermic or endothermic, enthalpy change depends on substances involved ( $riangle H_f^ heta$ ).

Vaporization

Endothermic process, enthalpy increases ( $riangle H>0$ ).

Deposition

Exothermic process, enthalpy decreases ( $riangle H<0$ ).

Chemical Reaction (Endothermic)

Endothermic reaction, enthalpy increases ( $riangle H>0$ ).

Condensation

Exothermic process, enthalpy decreases ( $riangle H<0$ ).

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