Chem Exam 4

Card Set Information

Author:
nextMD
ID:
120849
Filename:
Chem Exam 4
Updated:
2011-12-07 02:13:49
Tags:
Chem Exam
Folders:

Description:
Chem Exam 4
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user nextMD on FreezingBlue Flashcards. What would you like to do?


  1. Work +
    Container Compresses
  2. Work -
    Container Expands
  3. Work negative
    ∆ V = positive
  4. Work positive
    ∆ V = negative
  5. How to find ∆ V:
    number of gas moles (final) - number of gas moles (initial)
  6. ∆ E = All energy (heat and work) exchanged with surroundings
    • q + w
    • q = heat energy
    • w = work energey
  7. Work =
    • -negative (pressure * delta V)
    • -(P∆V)
  8. 1 L atm =
    101.3 J
  9. First Law of Thermodynamics:
    • ∆Esurrounding = - ∆Esystem
    • Energy lost in a system is being released to the surroundings
  10. Which diagram requires energy? Which one gives off energy?
    • The reaction on the left requires energy (∆E=+)
    • The reaction on the right releases energey (∆E=-)
  11. ∆E = q + w
    • q = heat energy (in j)
    • w = - (P∆V) to get in j multiply by (101.3 j / 1 L) conversion
  12. scc packing structure
    • 1 sphere
    • AAA pattern
    • a = 2r
  13. bcc packing structure
    • 2 spheres
    • ABAB pattern
    • a = 4r/√3
  14. fcc packing structure
    • 4 spheres
    • ABCABC pattern
    • a = √8r
  15. When volume is contant, q =
    • q = C x ∆ T
    • C = Heat capacity
    • Unit = J / g ° Celsius
  16. q =
    • q = m x Cs x ∆T
    • m = mass in grams
    • Cs = Specific Heat Capacity J / g ° C
  17. ∆ E rxn =
    • ∆ E rxn = qv
    • w = 0, since volume is constant
  18. qcal = - qrxn
    In Bomb Calorimeter, where V is constant
    • qcal = Ccal x ∆ T
    • Ccal = Specific heat
  19. ∆ Hrxn =
    ∆ Hrxn = qrxn / mol of Rxn
  20. ∆ H = measure of only heat exchanged under Constant P
    • ∆ H = + heat flows INTO system - endothermic
    • ∆ H = - heat flows OUT of a system - exothermic

What would you like to do?

Home > Flashcards > Print Preview