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Energie Zusammenfassung, Chemie - Abitur
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Ich verkaufe meinen Lernzettel für Energie im Fach Chemie, Abitur in Niedersachsen. Die Zusammenfassung basiert auf Abiturrelevanten Themen im LK.
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Energie kann weder erzeugt noch vernichtet werden, nur eine Umwandlung in eine andereEnergieform ist möglich!
Molstern: n = m / M
Stoffmenge [mol] (1mol= 6,022*10 23) = Masse [g] / Molmasse [g/mol] (Atommasse im PSE)
Q = m * c * ∆T
Reaktionswärme [kJ] = Masse [kg] * spezifische Wärmekapazität[kJ/K*kg] * Temperaturdifferenz [K]
Um bspw. auf 1 kg zu berechnen: Dreisatz anwenden
Beispiel:
Satz von Hess: Die Reaktionsenthalpie ∆RH ist nicht vom Reaktionsweg abhängig, sondern nur von
Edukten und Produkten
∆RH°m = ∑∆fH (Produkte) - ∑∆fH (Edukte)
Alles in [kJ/mol]
Vorgehensweise:
1. Reaktionsgleichung aufstellen
2. Bildungsenthalpien unter den jeweiligen Stoff schreiben
3. Formel anwenden
Falls es nicht auf 1mol bezogen ist, erst Stoffmenge n
ausrechnen und dann mit ∆RH mal nehmen
→ ∆RH°m = n * ∆RH
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