Week 03 - Instructor

Week 03 - Instructor - UA GenChem General Chemistry I I...

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Unformatted text preview: UA GenChem General Chemistry I I General Chemistry I I CHEM 152 CHEM 152 Week 3 UA GenChem Week 3 Reading Assignment Chapter 13 – Sections 13.5 (temper atur e), 13.7 (catalysts) UA GenChem Temper atur e and Rate • We bave seen that, gener ally, as temper atur e incr eases so does the r eaction r ate. • But the power s in the r ate law do N OT change • This means that k is temper atur e dependent . k Temperature We need a micr oscopic model to explain this UA GenChem Thr ee conditions must be met at the molecular level if a r eaction is to occur : The molecules must collide ; They must be positioned so that the r eacting gr oups ar e together in a tr ansition state between r eactants and pr oducts; The collision must have enough ener gy to for m the tr ansition state and conver t it into pr oducts. Collision Rate Model UA GenChem Molecules must collide with the cor r ect or ientation and with enough ener gy to cause bond br eakage and for mation. Right Or ientation UA GenChem Activation Ener gy • Ther e is a minimum amount of ener gy r equir ed for r eaction: the activation ener gy , UA GenChem Activation Ener gy – Example Consider this r elevant pr ocess: We ar e using natur al gas to power vehicles. Methane UA GenChem The higher the temper atur e, the mor e molecules have ener gy to over come the activation ener gy bar r ier . Low T High T Extra molecules at high T that exceed the Ea Enough Ener gy UA GenChem Tr ansition State UA GenChem Reaction Coor dinate Diagr ams Reaction coor dinate diagr ams help visualize ener gy changes thr oughout a pr ocess....
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Week 03 - Instructor - UA GenChem General Chemistry I I...

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