Chem FINAL Part 1

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Author:
gerardcb
ID:
88328
Filename:
Chem FINAL Part 1
Updated:
2011-05-31 08:44:26
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Chemistry
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FINALS
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  1. In a chemical equation, what indicates the number of particles or moles of each substance taking part in a reaction?
    Coefficients
  2. What type of reaction releases heat? Absorbs heat?
    Exothermic = Releases ; Endothermic = Absorbs
  3. Is combustion an exothermic or an endothermic reaction?
    Exothermic
  4. What is activation energy?
    Energy to get a reaction started
  5. 2NO + Br2 <--> 2NOBr + heat

    a. In which direction will the equilibrium shift if the pressure is increased?

    b. In which direction will the equilibrium shift if the concentration of Br2 is increased?

    c. In which direction will the equilibrium shift if the concentration of NOBr is decreased?

    d. In which direction will the equilibrium shift if the temperature is increased?

    e. In which direction will the quilibrium shift if NO is removed?
    • a. right
    • b. right
    • c. right
    • d. left
    • e. left
  6. The ability of gases to spread rapidly through other gases is explained by constant ____ ____ of ____.
    Random Motion of Particles
  7. What happens to motion of particles at absolute zero?
    Particles stop moving
  8. A 3.0 liter container of hydrogen had a pressure of 4.2 atm. What volume would be necessary to decrease the pressure to 2.0 atm?
    • P1V1 = P2V2
    • (4.2atm)(3.0L) = (2.0atm)(V2)
    • V2 = 6.36
  9. What are the 3 types of intermolecular forces?
    Dispersion force, dipole - dipole, hydrogen bonding

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