Practice Quiz

MCAS Biology Practice - Question List

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231. Which of the following statements describes properties of most metals?
  1. They have high melting and boiling points.
  2. They accept electrons to form negative ions.
  3. They have densities lower than that of water.
  4. They share electrons to form covalent bonds.
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232. Which of the following statements explains how a buffer maintains pH when small amounts of a strong base are added?
  1. The salt in the buffer absorbs the base.
  2. The water in the buffer dilutes the base.
  3. The weak acid of the buffer neutralizes the base.
  4. The weak base of the buffer neutralizes the base.
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233. What is the mass of one mole of helium gas?
  1. 2 g
  2. 4 g
  3. 8 g
  4. 22 g
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234. Which of the following correctly describes molecules of two different gases if they are at the same temperature and pressure?
  1. They must have the same mass.
  2. They must have the same velocity.
  3. They must have the same average kinetic energy.
  4. They must have the same average potential energy.
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235. A solution that contains less solute than it can hold at a given temperature is
  1. disassociated.
  2. saturated.
  3. supersaturated.
  4. unsaturated.
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