89.5 Arrhenius equation 9.5.3 Empirical rules (2)Arrhenius hypothesis Arrhenius postulated that only a small part of sucrose molecules with higher energy(activated In 1889, Arrhenius made theoretical molecules) can react with water and, therefore consideration on the hydrolysis of the reaction can only proceed at a low rat sucrose, in which sucrose molecules By taking enough energy, the common sucrose were surrounded by water. if all sucrose molecules can change into activated molecules molecules could react directly with The energy needed for this conversion was called water, the reaction should completed activation energy. instantly. However, this is not the case [A revolutionary concept: I Arrhenius, S.A. (1889). " Uber die Dissociationswarme und den EinflusB der Temperatur auf den Dissociationsgrad der Elektrolyte".Z. Phys. Chem. 4:96-116: 4: 226-248
In 1889, Arrhenius made theoretical consideration on the hydrolysis of sucrose, in which sucrose molecules were surrounded by water, if all sucrose molecules could react directly with water, the reaction should completed instantly. However, this is not the case. (2) Arrhenius hypothesis Arrhenius postulated that only a small part of sucrose molecules with higher energy (activated molecules) can react with water and, therefore, the reaction can only proceed at a low rate. By taking enough energy, the common sucrose molecules can change into activated molecules. The energy needed for this conversion was called activation energy. [A revolutionary concept!] 9.5.3 Empirical rules Arrhenius, S.A. (1889). "Über die Dissociationswärme und den Einflusß der Temperatur auf den Dissociationsgrad der Elektrolyte". Z. Phys. Chem. 4: 96–116; 4:226-248 §9.5 Arrhenius equation
89.5 Arrhenius equation 9.5.3 Empirical rules (2)Arrhenius hypothesis dInk E Arrhenius equation Arrhenius extended the ideas of vant 'Hoff dT RT and suggested a similar empirical equation Is the simplification reasonable? dInk A dT 72+B1 dInk E Definition of activation energy dT RT experimental activation energy e aIn K 4 aIn Ke E=RT2 dIn k OT' R72 dT aT RT
Arrhenius extended the ideas of vant’ Hoff and suggested a similar empirical equation. Is the simplification reasonable? Arrhenius equation 2 d ln d E a k T RT = 2 d ln B d k A T T = + 2 d ln d E a k T RT = 2 ln r m p K H T RT = 2 ln r m p K U T RT = (2) Arrhenius hypothesis 9.5.3 Empirical rules §9.5 Arrhenius equation 2 d ln = d a k E RT T Definition of activation energy— experimental activation energy