Practice Quiz

CLEP Chemistry Practice Test - Question List

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101. Gold-198 has a half-life of approximately 3 days. If a 100 g sample of gold-198 decays for 9 days, approximately how much gold-198 remains in the sample?
  1. 13 g
  2. 25 g
  3. 33 g
  4. 50 g
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102. Formaldehyde in solution is used as a preservative. It has a melting point of -92°C. When the temperature of a sample of formaldehyde rises from -93°C to -91°C, which of the following occurs?
  1. The molecules move more freely.
  2. The molecules lose electrical charge.
  3. The molecules break apart into atoms.
  4. The molecules become fixed in a crystal structure.
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103. Which of the following solutions has the highest concentration of solute?
  1. 1.0 mol solute in 200 mL solvent
  2. 2.0 mol solute in 500 mL solvent
  3. 3.0 mol solute in 1 L solvent
  4. 4.0 mol solute in 1.5 L solvent
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104. A hiker carries drinking water in a cloth-covered, metal container called a canteen. During the summer, the hiker wets the cloth covering so that the water in the canteen stays cool. Which of the following statements explains why a wet covering keeps the water cool?
  1. A wet covering transfers coolness to the water in the canteen.
  2. A wet covering insulates the canteen better than a dry covering.
  3. Evaporation of water from the covering transfers heat away from the canteen.
  4. Condensation of water from the covering transfers heat away from the canteen.
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105. The reaction below shows carbon monoxide burning in oxygen:

2CO + O2 ↔ 2CO2

What is the change in the oxidation number of carbon for this reaction?
  1. +2 to +1
  2. +2 to +4
  3. +4 to +1
  4. +4 to +2
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