Practice Quiz

Praxis II: Chemistry Exam Prep - Question List

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11. What set of coefficients correctly balances the following equation?

____CH3OH(l) + _____O2(g) --> _____CO2(g) + _____H2O(g)
  1. 2, 3, 2, 1
  2. 1, 2, 2, 1
  3. 2, 3, 4, 2
  4. 2, 3, 3, 4
  5. 2, 3, 2, 4
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12. Which of the following solutions has the highest boiling point?
  1. 1 M NaOH
  2. 1 M CaCl2
  3. 1 M NaCl
  4. 1 M KNO3
  5. 1 M LiCl
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13. 1.75 moles of NaCl are dissolved in 1.00 kg of water. What is the boiling point of this solution (kb = .512 degrees C·kg/mol for water)?
  1. 101.79 degrees Celsius
  2. 100.00 degrees Celsius
  3. 98.21 degrees Celsius
  4. 102.22 degrees Celsius
  5. 100.50 degrees Celsius
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14. What is the expected O-C-O bond angle is a molecule of CO2?
  1. 90 degrees
  2. 165 degrees
  3. 180 degrees
  4. 120 degrees
  5. 135 degrees
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15.

Calculate the bond dissociation energy in the following equation, given the information below:

CH4(g) + 2O2(g) --> CO2(g) + 2H20(g)

For reference:

DHf° C-H = 87 Kcal/mol
DHf° O=O = 118 Kcal/mol
DHf° C=O = 178 Kcal/mol
DHf° O-H = 111 Kcal/mol
 

  1. +584 KCal
  2. +216 KCal
  3. -584 KCal
  4. -216 KCal
  5. -228 KCal
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