Practice Quiz

MCAS Chemistry Exam Practice - Question List

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66. Which of the following is an example of a physical change?
  1. Iron exposed to air produces rust.
  2. Hydrogen combined with oxygen forms water.
  3. Sulfur combined with oxygen produces sulfur dioxide.
  4. Liquid nitrogen exposed to air becomes nitrogen gas.
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67. Which of the following trends in the periodic table should be expected as the atomic number of the halogens increases from fluorine (F) to iodine (I)?
  1. Atomic radius decreases.
  2. Electronegativity decreases.
  3. Atomic mass decreases.
  4. Electron number decreases.
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68. Which of the following statements describes the elements in family 16 of the periodic table?
  1. They have six valence electrons.
  2. They are all gases at room temperature.
  3. They exist commonly as cations in nature.
  4. They combine easily with elements in family 17.
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69. Which of the following is an example of a chemical change?
  1. burning a scented candle
  2. cutting an apple into slices
  3. freezing liquid water into an ice cube
  4. melting a stick of butter to pour over popcorn
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70. Which of the following describes a particle that contains 36 electrons, 49 neutrons, and 38 protons?
  1. an ion with a charge of 2 -
  2. an ion with a charge of 2 +
  3. an atom with a mass of 38 amu
  4. an atom with a mass of 49 amu
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