Lec-08-Exam1Review-bare

Lec-08-Exam1Review-bare - Lec-08-ExamReview-bare 9/19/2011...

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Lec-08-ExamReview-bare 9/19/2011 Review for 1 st Exam: Chaps 6 and 13 1 Lec-08: Catalysis - First Midterm - Review 1 CHE 132 First Midterm - Review Session: Monday September 19, 6:40 - 9:40 PM Harriman Hall 137 Room Assignments Solar ID Room 000000000 – 107757371 Javits 100 Main Floor 107757372 – 999999999 Javits 100 Balcony Enzymes: Biological Catalysis Enzymes are usually globular proteins consisting of one or more long chains of amino acids folded in nearly spherical shape. They are highly efficient catalysts for one or more chemical reactions in living organisms (very specific) . They can increase the rates of reaction by factors of 10 9 to 10 19 . 2
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Lec-08-ExamReview-bare 9/19/2011 Review for 1 st Exam: Chaps 6 and 13 2 Enzymes: Biological Catalysis Enzymes are usually globular proteins consisting of one or more long chains of amino acids folded in nearly spherical shape. 3 They are highly efficient catalysts for one or more chemical reactions in living organisms (very specific) . They can increase the rates of reaction by factors of 10 9 to 10 19 . Fig. 13-16, p.647 Substrate S Enzyme-Substrate complex ES 4
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Lec-08-ExamReview-bare 9/19/2011 Review for 1 st Exam: Chaps 6 and 13 3 Enzymes: Biological Catalysis The overall reaction is substrate products P S The enzyme-catalyzed reaction mechanism is     enzyme-substrate co enzyme catalyst enzyme cat mplex enzyme-substrate complex alyst pr subs oduc trate t fast E E E slo S S E w P + S 5 Enzymes: Biological Catalysis The activation energy is considerably reduced, and the reaction is much faster. enzyme-substrate complex enzyme-substrate co enzyme substra m cat ple alyst enzyme produ x c cataly t s te t E E S P S + ES E 6
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Lec-08-ExamReview-bare 9/19/2011 Review for 1 st Exam: Chaps 6 and 13 4 Lec-08: First Midterm - Review 7 Internal Energy       potentia kineti int n c l l er a EE E E In chemistry we are (almost) always concerned with situations where E (kinetic) and E (potential) remain constant throughout the process of interest . Internal energy (strongly affected by temperature)   kinetic and potential energies of the molecules in the ga inte a s rn l E    8
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Lec-08-ExamReview-bare 9/19/2011 Review for 1 st Exam: Chaps 6 and 13 5 First Principle of Thermodynamics Conservation of energy: energy cannot be created or destroyed. E q w    Energy exchanged by the sy Change in internal energy o stem with surroundings as f the syst heat or wo em rk 9 10 ext i0 00 f if 0 w w PV V w V    fi V V V  
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Lec-08-ExamReview-bare 9/19/2011 Review for 1 st Exam: Chaps 6 and 13 6 Processes at constant volume and at constant pressure At constant volume 00 Vw   From the general expression of the first principle constant V V E q w E q      It is convenient to introduce a new thermodynamic state function , the enthalpy H = E + PV, such that ext for any process in which constant p PP q H
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-08-Exam1Review-bare - Lec-08-ExamReview-bare 9/19/2011...

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