Practice Quiz

CLEP Chemistry Practice Test - Question List

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26. After crude oil is pumped out of the ground, it must be processed in a “cracking tower.” The tower separates it into less dense chemicals like butane and gasoline, and more dense chemicals like diesel fuel and tar. Based on this information, crude oil can best be classified as a
  1. pure compound.
  2. mixture of compounds.
  3. mixture of pure elements.
  4. solution of plasma and liquid.
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27. When a cup of hot chocolate cools from 90°C to 80°C, which of the following is happening to the molecules of the liquid?
  1. Their rate of motion is decreasing.
  2. Their valence electrons are being lost.
  3. Their positions are becoming fixed in crystals.
  4. Their average distance from adjacent molecules is increasing.
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28. A reaction yields 6.26 g of a product. What is the percent yield if the theoretical yield is 18.81 g?
  1. 3.00%
  2. 10.6%
  3. 33.3%
  4. 56.1%
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29. Which of the following statements describes a gamma ray?
  1. A gamma ray has no mass.
  2. A gamma ray has a positive charge.
  3. A gamma ray can be stopped by a sheet of paper.
  4. A gamma ray can be converted into a beta particle.
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30. When a scuba diver is deep underwater and exhales, air bubbles form and rise to the surface of the water. Which of the following statements best describes what happens to the air bubbles as they rise to the surface?
  1. The number of molecules in the bubbles increases, and the diameter of the bubbles increases.
  2. The number of molecules in the bubbles decreases, and the diameter of the bubbles decreases.
  3. The number of molecules in the bubbles remains the same, and the diameter of the bubbles increases.
  4. The number of molecules in the bubbles remains the same, and the diameter of the bubbles decreases.
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