Practice Quiz

MCAS Chemistry Exam Practice - Question List

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71. The final elements produced by radioactive decay differ from the original radioactive elements because the nuclei of the fi nal elements are always
  1. more stable.
  2. increased in mass.
  3. half as radioactive.
  4. positively charged.
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72. Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X fl oats in the water, and Block Y sinks to the bottom of the container. Which of the following statements is an accurate conclusion from this demonstration?
  1. Block Y is heavier than Block X.
  2. Block Y is less dense than Block X.
  3. Block Y has a smaller volume than Block X.
  4. Block Y would float if more water were added.
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73. Concrete is composed of Portland cement, rocks, sand, and water. Which of the following best describes concrete?
  1. an element
  2. a compound
  3. a homogenous mixture
  4. a heterogeneous mixture
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74. Four different gases are all observed to have the same temperature. Which of the following conclusions is supported by this observation?
  1. All four gases must have the same mass.
  2. All four gases must have the same pressure.
  3. All four gases must have equal numbers of particles.
  4. All four gases must have equal average kinetic energies.
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75. Atoms of element A and atoms of element B react to form a compound. In the reaction, the radius of each atom of element A is decreased. Which of the following explains this decrease in atomic radius in the reaction?
  1. The atoms of element A lose electrons to atoms of element B.
  2. The atoms of element A gain neutrons from atoms of element B.
  3. Nuclear particles are converted into energy in atoms of element A.
  4. Protons become more densely packed in the nuclei of element A atoms.
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