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Water, pH and Macromolecules problems


  • 1. Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?

  • Options
  • A. Michaelis-Menten equation
  • B. Haldanes equation
  • C. Henderson-Hasselbalch equation
  • D. Hardy-Windberg law
  • Discuss
  • 2. Which of the following will easily dissolve in a polar solvent?

  • Options
  • A. gasoline (heptanes & octanes)
  • B. methane
  • C. argon
  • D. sodium chloride
  • Discuss
  • 3. Which of the following statements about covalently bonded molecules is false?

  • Options
  • A. Electrons are shared between the atoms that make up the molecule
  • B. Noncovalent bonds may also be present, especially if the molecule is large
  • C. Such molecules often result from the interaction of ionized atoms
  • D. The chemical bonds that hold the molecule together are relatively strong
  • Discuss
  • 4. The lone pair electrons on oxygen in a H20 molecule

  • Options
  • A. carry a partial positive charge
  • B. are not important for the properties of water
  • C. carry a partial negative charge
  • D. form covalent bonds in ice
  • Discuss
  • 5. Hydrogen bonds and hydrophilic interactions are types of

  • Options
  • A. weak chemical bonds that hold together the atoms within a molecule
  • B. strong chemical bonds that hold together the atoms within a molecule
  • C. weak chemical bonds that link together separate molecules
  • D. strong chemical bonds that link together separate molecules
  • Discuss
  • 6. Who discovered and described the blood groups (ABO) classification?

  • Options
  • A. Theodor Kocher
  • B. Karl Landsteiner
  • C. Otto Warburg
  • D. Karl Hooper
  • Discuss
  • 7. Weak acids generally have pKa

  • Options
  • A. values less than 1
  • B. pKa values greater than 2
  • C. been seldom found in living systems
  • D. that cannot be used to buffer
  • Discuss
  • 8. Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

  • Options
  • A. noncovalent
  • B. covalent
  • C. ionic
  • D. hydrogen
  • Discuss
  • 9. The dissociation constant of H2O at 25° C is

  • Options
  • A. 10-14 M
  • B. 1014 M
  • C. 10-7 M
  • D. 107 M
  • Discuss
  • 10. The pH of a solution is determined by

  • Options
  • A. concentration of salt
  • B. relative concentration of acids and bases
  • C. dielectric constant of the medium
  • D. environmental effect
  • Discuss

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