Practice Quiz

MCAT Biology - Question List

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256. Which of the following helps explain why honey dissolves more rapidly in hot water than in cold water?
  1. The honey and hot water form more covalent bonds.
  2. The hot water is more chemically reactive with the honey.
  3. The honey breaks down into free atoms more quickly in the hot water.
  4. The greater motion of hot water molecules disperses the honey more quicly.
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257. The addition of 500 J of energy to a block of iron causes a rise in the average kinetic energy of the atoms in the block. Which of the following instruments can best be used to observe this change?
  1. a ruler
  2. a balance
  3. a thermometer
  4. a graduated cylinder
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258. Which of the following substances has the highest concentration of hydrogen ions in solution?
  1. bleach - pH 13
  2. water - pH 7
  3. tomato juice - pH 4
  4. vinegar - pH 3
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259. Which of the following is an example of nuclear fusion?
  1. Hydrogen-1 and hydrogen-2 combine to form helium-3.
  2. Polonium-210 decays into lead-206 and an alpha particle.
  3. Carbon-14 breaks down into a beta particle and nitrogen-14.
  4. Uranium-235 and a neutron produce barium-141, krypton-92, and three neutrons.
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260. Which of the following has the greatest mass?
  1. 1 mole of H2
  2. 2 moles of K
  3. 3 moles of Mg
  4. 4 moles of He
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