Practice Quiz

CLEP Chemistry Practice Test - Question List

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6. A student adds iron filings to a copper(II) chloride solution at room temperature. A balanced equation for the reaction that occurs is shown below. Fe(s) + CuCl2(aq) → FeCl2(aq) + Cu(s)

Which of the following changes would most likely increase the reaction rate?
  1. using larger pieces of iron
  2. performing the reaction in an ice bath
  3. decreasing the volume of the CuCl2 solution
  4. increasing the concentration of the CuCl2 solution
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7. The equation below shows the reaction of ammonia with water: NH3(q) + H2O(I) ↔ NH4+(aq) + OH-(aq)

According to the Brønsted-Lowry theory of acids and bases, which of the following is acting as the acid for the forward reaction?
  1. NH3
  2. H2O
  3. NH4+
  4. OH-
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8. Which of the following statements best describes what happens to water during evaporation?
  1. The temperature of the water increases until the water molecules react with nitrogen in the air.
  2. Water molecules on the surface overcome intermolecular forces and change into the gas phase.
  3. Water molecules on the surface come in contact with air molecules and are pulled into the gas phase.
  4. The temperature of the water increases until the water molecules separate and form oxygen and hydrogen gas.
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9. Which of the following statements best describes a difference between nuclear fission and nuclear fusion reactions?
  1. Nuclei split during fission and combine during fusion.
  2. Fission forms heavier elements, and fusion forms lighter elements.
  3. Fission generates potential energy, and fusion generates kinetic energy.
  4. Nuclei gain electrons during fission and release electrons during fusion.
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10. Iron(II) chloride (FeCl2) is a product of the reaction between iron metal (Fe) and hydrochloric acid (HCl), as shown in the equation below. Fe + 2HCl → FeCl2 + H2. What is the change in oxidation number of iron in this reaction?
  1. from 0 to +2
  2. from +1 to +2
  3. from 0 to -2
  4. from -1 to -2
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