Practice Quiz

MCAS Chemistry Exam Practice - Question List

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21. Which of the following statements best explains why atoms bond?
  1. Atoms bond to make new substances.
  2. Atoms bond to become less chemically stable.
  3. Atoms bond to change from a liquid to a solid.
  4. Atoms bond to become more chemically stable.
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22. When a sample of potassium chloride dissolves in water, it separates into potassium ions and chloride ions. Which of the following best accounts for the positive charge of the potassium ions?
  1. They have extra mass.
  2. They have a large volume.
  3. They have fewer electrons than protons.
  4. They have a high density of neutrons and protons.
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23. Which of the following characteristics allows blood to resist changes in pH?
  1. acidity
  2. basicity
  3. buffering capacity
  4. clotting factors
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24. Which of the following statements applies to a nuclear fission reaction?
  1. The reaction has no commercial applications.
  2. The reaction takes place only at very high temperatures.
  3. The reaction produces only shortlived radioactive waste.
  4. The reaction releases large amounts of energy when nuclei split apart.
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25. Gold-198 has a half-life of approximately 3 days. If a 100 g sample of gold-198 decays for 9 days, approximately how much gold-198 remains in the sample?
  1. 13 g
  2. 25 g
  3. 33 g
  4. 50 g
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