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Chapter 6 Notes - ∆ o Define signs from system’s...

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Chapter 6—Thermochemistry Energy Flow and Chemical Change Definitions o System: that part of the universe being studied o Surroundings: everything else that is relevant o Heat (q): energy transferred due to T o Work (w): energy transferred when object is moved by a force Mechanical Electrical o Internal energy (E): sum of potential and kinetic energy for all particles in a system o Units: Joule (J)= 1kg m 2 /s 2 I calorie (cal)= 4.184 J I atm*L=101.3 J Electrolysis H 2 O H 2 + ½ O 2 First Law of Thermodynamics: o Total energy of universe is constant o E universe =O= E system + E sum o E= q+w
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Unformatted text preview: ∆ o Define signs from system’s perspectice CT #2: A system absorbs 550 J of heat and used 200 J to do work on its surroundings. What is the net change in internal energy of the system A) +750 J B) -750 J C) +350 J D) -350 J • State Function o Property that depends only on current state, not on path Ex: P,T,V,n, E are state functions Q and w are not state functions E=E ∆ fixed-E initial • Enthalpy (H) o Most changes occur at constant P o Most common type of work is “PV” work • Q p = E + P V= H ∆ ∆ ∆...
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