Practice Quiz

CLEP Chemistry Practice Test - Question List

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21. Which of the following statements best explains why ionic solids dissolve in water?
  1. Water has high surface tension.
  2. Water is a highly polar molecule.
  3. Water is more dense as a liquid than as a solid.
  4. Water has a higher boiling point than predicted by its molar mass.
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22. The chemical equation below represents sulfur trioxide (SO3) in the atmosphere mixing with rainwater to form sulfuric acid (H2SO4), which is a major component of acid rain:

SO3(g) + H2O(I) → H2SO4(I)

The molar mass of SO3 is 80.1 g/mol and the molar mass of H2SO4 is 98.1 g/mol. How much H2SO4 is produced when 128.0 g of SO3 mixes with rainwater?
  1. 98.1 g
  2. 105 g
  3. 128 g
  4. 157 g
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23. Which of the following actions decreases the entropy of a system?
  1. boiling water
  2. freezing water
  3. dissolving salt in water
  4. mixing baking soda and salt
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24. Which of the following statements explains why the human body produces chemical buffers?
  1. Buffers maintain a constant pH in the blood.
  2. Buffers dissolve salts and minerals in the blood.
  3. Buffers decompose food molecules during digestion.
  4. Buffers catalyze chemical reactions in the body cells.
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25. A 6.0 M solution of HCl is diluted to 1.0 M. How many milliliters of the 6.0 M solution would be used to prepare 100.0 mL of the diluted 1.0 M solution?
  1. 6 mL
  2. 17 mL
  3. 33 mL
  4. 100 mL
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