Practice Quiz

CLEP Chemistry Practice Test - Question List

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71. What is the chemical formula for ammonium sulfate?
  1. NH4SO4
  2. NH4(SO4)2
  3. NH4(SO4)3
  4. (NH4)2SO4
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72.
The atomic theories of Dalton, Thomson, Rutherford, and Bohr all support which of the following statements?
  1. Atoms are mostly composed of empty space.
  2. All matter is composed of tiny, discrete particles called atoms.
  3. Electrons orbit the nucleus of an atom at distinct energy levels.
  4. Atoms are composed of positivelyand negatively charged particles.
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73. A leaf gently floats on a pond. Which of the following statements best explains why the leaf stays on top of the water?
  1. The leaf has nonpolar covalentbonds between its atoms.
  2. The density of the leaf is greater than the density of the water.
  3. The water molecules are held tightlytogether by hydrogen bonding.
  4. The hydrogen and oxygen atoms inthe water are chemically bonded.
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74. Silver (Ag) has 47 protons in each atom. Based on this information, which of the following also describes an atom of silver?
  1. It has no neutrons.
  2. It has 47 electrons.
  3. It has 23 neutrons and24 electrons.
  4. It has a total of 94 neutronsand electrons.
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75. In a hydrogen fluoride (HF) molecule,a hydrogen atom and a fluorine atom are held together by a polar covalent bond. Which of the following best explains why this bond is polar?
  1. the large difference in the atomic radii of hydrogen and fluorine atoms
  2. the large difference in the atomic masses of hydrogen and fluorine atoms
  3. the large difference in theelectronegativities of hydrogen and fluorine atoms
  4. the large difference in the numberof electrons of hydrogen andfluorine atoms
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