Lec-08-Exam1Review-Complete

Lec-08-Exam1Review-Complete - Lec-08: First Midterm -...

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Lec-08: First Midterm - Review Be sure to bring the following: • Stony Brook ID card • 2 or more #2 pencils and a good eraser • Calculator with extra batteries. Do NOT bring any of the following: • Cell phones, beepers, iPods, or other communication devices • Textbook, notes, or any aids to taking the exam Violations may result in a course grade of F and a report to the Academic Judiciary. Solar ID Room 000000000 – 106699991 Javits 100 (main floor only) 106699992 – 999999999 Javits 102 1
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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    2
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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 3
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4 ext i0 00 f if 0 w w PV V w V    fi V V V  
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5 A gas in a container with displaceable walls undergoes a process in which it receives 100 J of energy in the form of heat. In the process the internal energy of the gas increases by 80 J. Which of the following statements if correct? A. 0 B. 20J C. D. 0 E. 180J E q w V E    ANS: D
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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, such that ext for any process in which constant p PP q H  6
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Enthalpy Changes For any given transformation at constant pressure: (initial) → (final) >0 0 the system releases energy to its surroundings 0 exoterm the system absorbs energy from its surroundings 0 endot ic proces hermic pro s cess f i p H H H q H H  7
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Heat Capacity (at constant pressure)       specific extensive molar per unit mass pe r mo l m p H q m T C n T c T c   Heat capacity: heat exchanged by the system per unit change in its temperature under constant external pressure : 0 J heat capacity per unit mass, kg C C c m    0 J heat capacity per mol, mol C m C c n 8
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m A , T A m B , T B m A , m B , T f Enthalpy Changes: Physical and Chemical Processes Transfer of energy between subsystems AB f B A A B cc T T T m m m m 9
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Enthalpy Changes: Physical and Chemical Processes                 -1 22 2 2 2 2 2 H g O g 2H O g 1 H g O g H O g 241.8kJ mol 2
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This note was uploaded on 01/02/2010 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-Complete - Lec-08: First Midterm -...

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