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Kemi 2 Kapitel 2

Reaktioners hastighet och riktning

TermDefinition
Aktiverat komplex En kortlivad mellanprodukt med hög energi.
Aktiveringsenergi Den energin som måste tillföras för att en reaktion ska ske.
Dubbelpil Anger att en reaktion är reversibel.
Endoterm reaktion Energi upptas från omgivningen och entalpin ökar.
Exoterm reaktion Energi avges till omgivningen och entalpin minskar.
Gynnsam kollision
Intermediär En mellanprodukt som bildas medan en kemisk reaktion pågår. Kortlivad och reagerar vidare.
Katalysator Ökar reaktionshastigheten genom att ändra reaktionsförloppet så att det krävs lägre aktiveringsenergi. Efter reaktionen finns katalysatorn oförändrad.
Momentan reaktion
Reaktionshastighet Anger hur stor substansmängd av ett ämne som förbrukas eller bildas per tidsenhet, eller hur mycket koncentrationen av dessa ämnen ändras per tidsenhet.
Reaktionsmekanism
Reaktionsriktning
Reversibel reaktion En reaktion som kan ske i både riktningar.
Spontan reaktion
 

 



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