Practice Quiz

MCAS Chemistry Exam Practice - Question List

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31. 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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32. Which of the following elements is a metalloid?
  1. magnesium
  2. silicon
  3. phosphorus
  4. cobalt
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33. 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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34. Which of the following statements best explains why water vapor condenses as temperature decreases?
  1. Collisions between water vapor molecules become elastic.
  2. Water vapor molecules chemically react when they collide.
  3. Water vapor molecules are pulled together by the force of gravity.
  4. Attractive forces between water vapor molecules overcome molecular motion.
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35. Which of the following elements is a member of the halogen family and is located in period 3?
  1. argon (Ar)
  2. bromine (Br)
  3. chlorine (Cl)
  4. sulfur (S)
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