Practice Quiz

CLEP Chemistry Practice Test - Question List

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1.

Which of the following statements describes the difference between endothermic and exothermic chemical reactions?

  1. Energy is absorbed in endothermic reactions but is released in exothermic reactions.
  2. Energy is conserved in endothermic reactions but is not conserved in exothermic reactions.
  3. Endothermic reactions involve changes in the nucleus of an atom, but exothermic reactions do not involve changes in the nucleus.
  4. Endothermic reactions occur when electrons are shared between atoms, but exothermic reactions occur when electrons are transferred between atoms.
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2. Cobalt has an atomic mass of 59 and an atomic number of 27. What does this information reveal about most cobalt atoms?
  1. They contain more neutrons than protons.
  2. They naturally have a net negative charge.
  3. They attract protons more strongly than electrons.
  4. They form ions with a charge of 127 in compounds.
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3. Which of the following subatomic particles can be found inside the nucleus of an atom?
  1. electrons only
  2. neutrons only
  3. protons and neutrons
  4. protons, neutrons, and electrons
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4. Three identical balloons each contain one mole of gas. One balloon contains oxygen, one contains nitrogen, and one contains argon. Which of the following changes in volume will happen if the balloons are placed in a warmer room?
  1. The balloon with argon will decrease most in volume because argon is a noble gas.
  2. All of the balloons will decrease in volume equally because the temperature increased.
  3. The balloon with oxygen will increase most in volume because oxygen has the largest molecules.
  4. All of the balloons will increase in volume equally because they have equal numbers of molecules.
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5. How many electrons are in the outermost energy shell of a calcium atom?
  1. 1
  2. 2
  3. 6
  4. 8
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