Practice Quiz

CLEP Chemistry Practice Test - Question List

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61. Which of the following statements explains why elements of the alkali metal family are highly reactive?
  1. Alkali metals are easily ionized.
  2. Alkali metals are negatively charged.
  3. Alkali metals have an odd number of protons.
  4. Alkali metals have an odd number of electrons.
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62. Black powder was used as a propellant for fireworks for centuries. One of the components of black powder is potassium nitrate (KNO3). Black powder containing 1 mol of KNO3 releases 289 kJ of heat during combustion. The molar mass of KNO3 is 101 g/mol. How much heat is released if a firework contains 250 g of KNO3?
  1. 117 kJ
  2. 715 kJ
  3. 29, 189 kJ
  4. 72, 250 kJ
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63. What is the percent by mass of carbon in carbon dioxide (CO2)?
  1. 27%
  2. 33%
  3. 43%
  4. 73%
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64. A 0.50 L container at 305 K holds a 0.22 g sample of carbon dioxide gas (CO2). Assuming ideal gas behavior, what is the pressure, in kilopascals, exerted by the gas?
  1. 23 kPa
  2. 25 kPa
  3. 41 kPa
  4. 67 kPa
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65. Bismuth-210 (210/83 Bi) decays directly to polonium-210 (210/84 Po). Which of the following must be emitted during this radioactive decay?
  1. alpha particle
  2. beta particle
  3. neutron
  4. proton
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