Chemistry Chapter 10 pt 1

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misol
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301810
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Chemistry Chapter 10 pt 1
Updated:
2015-04-29 23:19:36
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chemistry sacco wake tech chapter 10
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wake tech sacco chemistry
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  1. Energy can be supplied or produced
    • H2O(s) --> H2O(l)
    •  |_________|
    •       system

    surrounding (outside system)
  2. Heat
    Transfer of thermal energy between two bodies at different tempers

    A + B --> C + D + energy (goes to surrounding)
  3. Exothermic Reaction
    heat (energy) is released from system to surrounding 

    H2(g) + O2(g) --> 2H2O(l) + energy
  4. Endothermic Reaction
    heat is absorbed by system from surrounding 

    energy + 2HgO(s) --> 2Hg(l) + O2(g)
  5. Reaction Progress Diagram
    Exothermic Reaction - Ending energy is lower in products than reactants 

    Endothermic Reaction - Energy in products is greater than energy in reactants
  6. Units
    • Joules
    • 1000 J = 1 KJ

    • Calorie (cal)
    • 1cal = 4.184J
    • 1000 cal = 1 Calorie = 1Kcal
  7. Thermodynamics
    • Study of inter conversions of heat and Energy 
    • Study change of state of a system
  8. State
    • composition, temp, pressure, energy, volume of system
    • *properties determined by state of the system no matter how that condition was achieved
    • *only care about final and initial condition
  9. Systems
    1. open system - exchange energy AND mass with surrounding

    2. closed system - can exchange energy BUT no mass

    3. isolated system - NO exchange energy or mass
  10. Laws of Thermodynamics
    • 1st - energy CAN be converted into other forms
    • (based on the conservation of energy)
  11. internal energy (U) , △U (state function) 2
    involves kinetic AND potential energy 

    • △U = -, exo
    • △U = +, endo
  12. Thermal Energy released by the system
    is absorbed by the surroundings

    • △Usys + △Usurrounding = no change
    • △Usys = - △Usurr
  13. Work (w) + heat (q)
    △U = w + q
    • if system works w < 0
    • if surrounding works w > 0 
    • if system releases heat q < 0 (exo rxn)
    • if system absorbs heat  q > 0 (endo rxn)
  14. To determine work
    we must know if we have a constant volume or constant pressure

    Pressure = force/area

    ie atm mmHg
  15. At constant
    W = -P△V

    • J = atmL
    • 101.3J = atmL

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