Practice Quiz

Praxis II: Chemistry Exam Prep - Question List

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81.
The products of a chemical reaction are solid zinc carbonate and aqueous sodium chloride. Which of the following procedures will achieve the best separation of the mixture into its three components?
  1. Filtering the mixture and then distilling the filtrate.
  2. Crystallizing the mixture and then decanting the aqueous portion.
  3. Centrifuging the mixture and then crystallizing the supernatant.
  4. Distilling the mixture and then centrifuging the distillate.
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82.
Which of the following statements correctly identifies a difference between a physical change and a chemical change?
  1. New atoms are formed in a chemical change but not in a physical change.
  2. Energy is conserved in a physical change but not in a chemical change.
  3. New substances are formed in a chemical change but not in a physical change.
  4. Mass is conserved in a physical change but not in a chemical change.
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83.
The constituent particles in a substance in its solid state tend to:
  1. Remain motionless.
  2. Vibrate about fixed positions.
  3. Slide freely past one another.
  4. Move constantly in straight lines.
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84.
According to the kinetic molecular theory, which of the following happens to the molecules of a gas when the gas is compressed?
  1. The average distance between the molecules decreases.
  2. The electrostatic repulsion between molecules decreases.
  3. The atomic radii of the atoms in the molecules decrease.
  4. The lengths of the bonds within the molecules decrease.
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85.
An atom with 6 protons, 6 neutrons, and 6 electrons gains an additional electron. What is the resulting charge of the atom?
  1. 7
  2. 1
  3. +1
  4. +7
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