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Free CLEP Science and Mathematics Exam Braindumps (page: 46)

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PDF with 494 Questions

The pOH of a 1.0 M solution of HBr is:

  1. l
  2. 4
  3. 7
  4. 10
  5. 114

Answer(s): E

Explanation:

The concentration of H+ is 1.0 because HBr dissociates completely. pH = -log[H+], or pH = -log 1 = 0. Because pOH = 14 - pH, pOH = 14.



PCl5(g) PCl3(g) + Cl2(g)

In this reversible endothermic reaction, which factor will result in more product formation?

  1. Removing PCl5
  2. Adding Cl
  3. Removing PCl3 as it is formed
  4. Increasing the pressure
  5. Cooling the reactant

Answer(s): C

Explanation:

Removing PCl3 as it is formed would shift the equilibrium to the products. Each of the other choices results in the equilibrium shifting to the reactants.



The splitting of a heavy nucleus into nuclei of lighter elements and releasing considerable amounts of energy is

  1. natural decay
  2. chain reaction
  3. atomic fusion
  4. atomic fission
  5. radioactivity

Answer(s): D

Explanation:

Atomic fission is defined as the splitting of a heavy nucleus into nuclei of lighter elements. Atomic fusion is the fusion of two lights elements into a heavier clement.



In a laboratory, a gas is heated to 128°

  1. What is the corresponding temperature in Kelvin?
  2. 395 K
  3. 326 K
  4. 312 K
  5. 128 K
  6. 53 K
  7. What is the corresponding temperature in Kelvin?

Answer(s): B

Explanation:

First, convert degrees Fahrenheit to degrees Celsius using °F = 1.8(°C) + 32. To convert from degrees Celsius to Kelvin, add 273.






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