Review Questions

4. If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?

  1. 54
  2. 27
  3. 100
  4. 108

5. Atoms that vary in the number of neutrons found in their nuclei are called ________.

  1. ions
  2. neutrons
  3. neutral atoms
  4. isotopes

6. Potassium has an atomic number of 19. What is its electron configuration?

  1. shells 1 and 2 are full, and shell 3 has nine electrons
  2. shells 1, 2 and 3 are full and shell 4 has three electrons
  3. shells 1, 2 and 3 are full and shell 4 has one electron
  4. shells 1, 2 and 3 are full and no other electrons are present

7. Which type of bond represents a weak chemical bond?

  1. hydrogen bond
  2. atomic bond
  3. covalent bond
  4. nonpolar covalent bond
8. Which of the following statements is not true?

  1. Water is polar.
  2. Water stabilizes temperature.
  3. Water is essential for life.
  4. Water is the most abundant molecule in the Earth’s atmosphere.
9. When acids are added to a solution, the pH should ________.

  1. decrease
  2. increase
  3. stay the same
  4. cannot tell without testing
10. We call a molecule that binds up excess hydrogen ions in a solution a(n) ________.

  1. acid
  2. isotope
  3. base
  4. donator
11. Which of the following statements is true?

  1. Acids and bases cannot mix together.
  2. Acids and bases will neutralize each other.
  3. Acids, but not bases, can change the pH of a solution.
  4. Acids donate hydroxide ions (OH–); bases donate hydrogen ions (H+).
12. Each carbon atom can bond with as many as________ other atom(s) or molecule(s).

  1. one
  2. two
  3. six
  4. four
13. Which of the following is not a functional group that can bond with carbon?

  1. sodium
  2. hydroxyl
  3. phosphate
  4. carbonyl

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Biology 2e for Biol 111 and Biol 112 Copyright © 2023 by Mary Ann Clark; Jung Choi; and Matthew Douglas is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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