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Free CLEP Science and Mathematics Exam Braindumps (page: 38)

Page 37 of 128
PDF with 494 Questions

How many liters of N, can be produced from the decomposition of 2 moles of NH3 at standard temperature and pressure?

  1. 11.2 L
  2. 22.4 L
  3. 44.8 L
  4. 67.2 L
  5. 89.6 L

Answer(s): B

Explanation:

The balanced reaction is 2NH3 N2 + 3H2. Thus, two moles of NH3 would produce one mole of N2. One mole is 22.4 L at STP.



Which of the following is not a homogeneous mixture?

  1. Air
  2. Sugar in water
  3. Salt in water
  4. Oil in water
  5. Acetone in water

Answer(s): D

Explanation:

A homogenous mixture is one in which the composition of the mixture is uniform throughout. Oil does not dissolve in water, thus the composition would not be uniform.



H2(g) + O(g) H2O(g)

In this reversible exothermic reaction, which factor will shift the equilibrium to the reactants?

  1. Adding H2O
  2. Adding H2
  3. Removing O
  4. Adding a catalyst
  5. Cooling

Answer(s): A

Explanation:

Addition of a product, H2O, will shift the equilibrium to the reactants.



Water is placed in a freezer. What is the effect on its energy content and entropy content? (Energy, entropy)

  1. Increase, increase
  2. Increase, decrease
  3. Decrease, increase
  4. Decrease, decrease
  5. No change, decrease

Answer(s): D

Explanation:

Heat flows from the water to the surroundings as the temperature of the water drops to the temperature of the freezer, hence a decrease in energy. When the water begins to freeze, it changes to a more ordered system, thus the entropy decreases.






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