Chap 1   Chapter 2 Self Quiz: The chemistry of biology   Chap 3

  1. Which particle has a negative charge and orbits the nucleus of an atom?
    1. proton (wrong)
    2. neutron (wrong)
    3. electron (correct)
    4. positron (wrong)
    5. ion (wrong)
      Hint
  2. Carbon plays a central role in many biological reactions because
    1. it has more electrons than protons (wrong)
    2. it has more protons than electrons (wrong)
    3. it has many vacancies in its outermost shell (correct)
    4. it has a complete outermost shell (wrong)
    5. it has more neutrons than protons (wrong)
      Hint
  3. What is the atomic number of the negatively charged ion formed in the diagram?
    1. 8 (wrong)
    2. 10 (wrong)
    3. 11 (wrong)
    4. 18 (wrong)
    5. 17 (correct)
      Hint
  4. Sodium chloride (NaCl) is composed of alternating sodium and chloride ions held together by ________ bonds.
    1. hydrogen (wrong)
    2. covalent (wrong)
    3. ionic (correct)
    4. cohesive (wrong)
    5. adhesive (wrong)
      Hint
  5. A covalent bond is the sharing of ________ electron(s).
    1. one (wrong)
    2. two (correct)
    3. three (wrong)
    4. four (wrong)
    5. eight (wrong)
      Hint
  6. A water molecule has
    1. two polar covalent bonds (correct)
    2. two ionic bonds (wrong)
    3. two hydrogen bonds (wrong)
    4. one double covalent bond (wrong)
    5. two double covalent bonds (wrong)
      Hint
  7. The dotted lines in this diagram are weak ________ bonds due to attraction of partially charged regions between water molecules.
    1. covalent (wrong)
    2. hydrogen (correct)
    3. oxygen (wrong)
    4. ionic (wrong)
    5. polish (wrong)
      Hint
  8. The property of water that is responsible for surface tension is called
    1. hydrophilic (wrong)
    2. hydrophobic (wrong)
    3. hydration (wrong)
    4. dehydration (wrong)
    5. cohesion (correct)
      Hint
  9. A solution with a high concentration of hydrogen ions is called a(n)
    1. buffer (wrong)
    2. base (wrong)
    3. alkaline water (wrong)
    4. alcohol (wrong)
    5. acid (correct)
      Hint
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