Practice Quiz

MCAS Biology Practice - Question List

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196. Which of the following statements describes all exothermic reactions?
  1. Exothermic reactions form gases.
  2. Exothermic reactions require a catalyst.
  3. The energy of the reactants is lower than the energy of the products.
  4. The energy of the reactants is higher than the energy of the products.
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197. Which of the following statements best explains why potassium (K) reacts easily with bromine (Br)?
  1. Potassium and bromine both have valence electrons in the fourth energy level.
  2. Potassium and bromine have the same number of electrons in their highest energy levels.
  3. Potassium has one electron in its highest energy level, and bromine needs one electron to complete its highest energy level.
  4. Potassium needs one electron to complete its highest energy level, and bromine has an extra electron in its highest energy level.
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198. 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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199. 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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200. 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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