Practice Quiz

MCAS Biology Practice - Question List

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206. Which of the following statements explains what happens to the gas inside a balloon as the external pressure on the balloon decreases and the temperature stays constant?
  1. The volume increases.
  2. The volume decreases.
  3. The molecular speed increases.
  4. The molecular speed decreases.
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207. Which of the following statements best explains why ice floats on water?
  1. Water has a higher specific heat than ice.
  2. Ice has the same molecular mass as water.
  3. Heat is absorbed when water changes from the solid state to the liquid state
  4. Hydrogen bonding causes water to be less dense in the solid state than in the liquid state.
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208. Which of the following did scientists learn about the atom from Rutherford’s gold foil experiment?
  1. Atoms combine in simple ratios to form compounds.
  2. Electrons travel around the nucleus of an atom in concentric circular paths.
  3. The mass of an atom and its positive charge are concentrated in the nucleus.
  4. The atomic mass of an atom is equal to the number of protons and neutrons in the nucleus.
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209. Which of the following elements is a metalloid?
  1. magnesium
  2. silicon
  3. phosphorus
  4. cobalt
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210. Two elements in a molecule have the same electronegativity values. Which of the following most likely holds the elements together and why?
  1. an ionic bond, because electrons transfer from one element to the other
  2. a nonpolar covalent bond, because the elements share electrons equally
  3. a polar covalent bond, because the elements do not share
    electrons equally
  4. an intermolecular force, because the elements do not form a chemical bond
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