Practice Quiz

Praxis II: Chemistry Exam Prep - Question List

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31. Calculate the change in entropy of the following equation:

FeCl3(s) + 3Na(s) --> Fe(s) + 3NaCl(s)
  1. 52.1 J/K
  2. -52.1 J/K
  3. 64.1 J/K
  4. -64.1 J/K
  5. -11.6 J/K
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32. What is the formal charge of the Nitrogen atom in NO3-?
  1. -2
  2. -1
  3. 0
  4. +1
  5. +2
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33. A fixed quantity of a gas undergoes a change in temperature from 100 K to 200 K and a change in pressure from 2 atm to 1 atm. After theses changes, the volume of the gas is
  1. Half of the original volume
  2. Unchanged
  3. Twice the original volume
  4. Four times the original volume
  5. Eight times the original volume
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34. 2.00 moles of N2 are held in a 10.0 liter container at 25.0 degrees Celsius. What is the pressure of the system?
  1. 3.32 atm
  2. 4.00 atm
  3. .763 atm
  4. 5.11 atm
  5. 4.89 atm
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35. A 40.0 gram sample of a radioactive element decays to 5.0 grams in 15 hours. What is the half-life of this element?
  1. 3 hours
  2. 2 hours
  3. 6 hours
  4. 7.5 hours
  5. 5 hours
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