Equation Test 1

25 Questions | Total Attempts: 119

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Equation Quizzes & Trivia

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Questions and Answers
  • 1. 
    The term used to indicate the degree of randomness within a system is
    • A. 

      Enthalpy

    • B. 

      Entropy

    • C. 

      H-TS

    • D. 

      Q/T

    • E. 

      Delta G

  • 2. 
    The biological classification system categorizes organisms into the domains:
    • A. 

      Bacteria, eukarya, and vertebrate

    • B. 

      Archaea and eukarya

    • C. 

      Bacteria, eukarya, and archaea

    • D. 

      Eukarya and bacteria

    • E. 

      None of the rest

  • 3. 
    If gas molecules in an enclosed space are allowed to enter a second chamber, the resulting redistribution of gas molecules represents an increase in
    • A. 

      Enthalpy

    • B. 

      Entropy

    • C. 

      Force

    • D. 

      Enthalpy and force

    • E. 

      All of the rest

  • 4. 
    Which of the following is a similarity between all prokaryotes and all eukaryotes?
    • A. 

      Both contain DNA in a nucleus

    • B. 

      Both contain certain of the same membrane bound cell organelles (like mitochondria, Golgi complexes etc)

    • C. 

      Both have a cytoskeleton

    • D. 

      All of the rest are similarities between prokaryotes and eukaryotes

    • E. 

      None of the rest are similarities between prokaryotes and eukaryotes

  • 5. 
    Which of the following statements concerning prokaryotes is false?
    • A. 

      Prokaryotes are made up of two major groupings: the eubacteria and the archaea, which are as different from each other as from the eukaryotes

    • B. 

      Prokaryotes are generally much smaller than the eukaryotic cells

    • C. 

      Prokaryotes are one branch of the newer, more accurate phylogenic tree made up of prokarya, archaea and eukarya

    • D. 

      Prokaryotes do not have organelles

    • E. 

      None of the rest

  • 6. 
    A spontaneous process
    • A. 

      Occurs without the addition of free energy

    • B. 

      Has a delta G < 0

    • C. 

      Is exergonic

    • D. 

      All of the rest

    • E. 

      None of the rest

  • 7. 
    An increase in disorder
    • A. 

      Is found in every exergonic process

    • B. 

      Is characteristic of a system increasing in enthalpy

    • C. 

      Is required for a process to be spontaneous

    • D. 

      Results in a decrease in entropy

    • E. 

      Results in the factor T delta S being positive

  • 8. 
    Phosphate, with a pK2 of 6.82, will be mostly in the HPO4(2-) form at pH 7.2. At pH 5.82 it is mostly in the _________________________  forms.
    • A. 

      H3PO4

    • B. 

      H2PO4(1-)

    • C. 

      HPO4(2-)

    • D. 

      PO4(3-)

    • E. 

      None of the rest

  • 9. 
    A solution of buffer at a pH of 8.5 with a pK = 7.5 would have more capacity to buffer the addition of
    • A. 

      Acid versus base

    • B. 

      Base versus acid

    • C. 

      PO4(3-)

    • D. 

      HPO4(2-) and PO4(3-)

    • E. 

      None of the rest

  • 10. 
    A phosphate buffer solution at a pH = pK1 = 2.15 would have equal amounts of phosphate in the ____________ form and the H2PO4(1-) form.
    • A. 

      HPO4(2-)

    • B. 

      H2PO4(1-)

    • C. 

      H3PO4

    • D. 

      Disordered

    • E. 

      Tetrahedral

  • 11. 
    Hydrogen bonds within liquid water:
    • A. 

      Are attractions between the protons of the oxygen nuclei

    • B. 

      Are dipole-dipole attraction

    • C. 

      Are ion-induced dipole attractions

    • D. 

      Are attractions between two hydrogen atoms

    • E. 

      Are attractions between the H(+) and OH(-) ions of the liquid

  • 12. 
    • A. 

      A hydrogen ion on the water molecule forms an ionic bond with a hydride ion on the other molecule

    • B. 

      The partial charge on a hydrogen of the water interacts with the partial charge on a hydrogen of the other molecule

    • C. 

      The hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom

    • D. 

      A hydrogen on the water molecule forms a covalent bond to a hydrogen atom on the other molecule

    • E. 

      The hydrogen atom is located between an oxygen atom of the water and a carbon atom of the other molecule

  • 13. 
    Hydrophobic interactions between nonpolar molecules or groups:
    • A. 

      Result from the tendency to maximize waterÕs contact with nonpolar molecules

    • B. 

      Require the presence of surrounding water molecules

    • C. 

      Are the result of strong attractions between nonpolar regions

    • D. 

      Are the result of strong repulsion between water and nonpolar regions

    • E. 

      Depend on strong permanent dipoles in the nonpolar molecules

  • 14. 
    To make a phosphate buffer at pH 6.82 starting with one liter of 10 mM phosphoric acid (H3PO4; pKs are of 2.15, 6.82, and 12.38), you could add
    • A. 

      5 millimoles of HCL

    • B. 

      20 millimoles of K+

    • C. 

      25 millimoles of HCL

    • D. 

      15 millimoles of KOH

    • E. 

      You can't make a buffer by adding HCL or KOH

  • 15. 
    To make an acetate buffer at pH 4.76 (pK = 4.76) starting with 500 mL of 0.1 M sodium acetate (pK = 4.76), you could add:
    • A. 

      0.1 moles of HCL

    • B. 

      0.025 moles of HCL

    • C. 

      You can't make a buffer by adding HCL or NaOH

    • D. 

      0.1 moles of NaOH

    • E. 

      0.2 moles of HCL

  • 16. 
    Amphiphilic molecules:
    • A. 

      Have both oxidizing and reducing groups

    • B. 

      Have chromophores in two different wavelength regions

    • C. 

      Have both acidic and basic groups

    • D. 

      Have both hydrophilic and hydrophobic groups

    • E. 

      Are micelles

  • 17. 
    Given log (0.00001)=-5; log(0.0001)=-4; and log(0.001)=-3. If you added a drop (about 0.05 mL) of 1.0 M HCL to one liter of pure water (assume pH 7.), the pH would become:
    • A. 

      7.0 (there would be no significant change)

    • B. 

      4.3

    • C. 

      5.0

    • D. 

      2.7

    • E. 

      9.7

  • 18. 
    What is the ratio of citric acid (pK1=3.09) to monosodium citrate in a 1.0 M citric acid solution with a pH = 2.09?
    • A. 

      10:11

    • B. 

      1:11

    • C. 

      10:1

    • D. 

      1:1

    • E. 

      1:10

  • 19. 
    Which of the following statements about water is incorrect?
    • A. 

      Water is an excellent solvent for polar molecules.

    • B. 

      Pure water has a concentration of approximately 55.5 M.

    • C. 

      Non-polar molecules do not dissolve in water, but form a separate phase.

    • D. 

      Cations (e.g. Na+) are solvated by shells of water molecules oriented with their hydrogen atoms pointed toward the ions.

    • E. 

      Amphiphilic detergents often form micelles with the polar groups on the outside exposed to the water (solvent) and the non-polar groups sequestered in the interior.

  • 20. 
    The strongest non-covalent interactions are:
    • A. 

      Van der Waal forces

    • B. 

      London dispersion forces

    • C. 

      Hydrogen bonds

    • D. 

      Dipole-dipole interaction

    • E. 

      Ionic interactions

  • 21. 
    Assuming you had a way to measure the amount of protein in a sample of food, which of the following elements would you measure in order to tell whether the food contained protein
    • A. 

      Oxygen

    • B. 

      Hydrogen

    • C. 

      Potassium

    • D. 

      Carbon

    • E. 

      Nitrogen

  • 22. 
    The Henderson-Hasselbalch equation, pH = pK + log {[A-] /[HA]} , indicates that when the _____ of a solution containing acid is equal to the _________ of that acid, then the acid is half deprotonated.
    • A. 

      PH and pK

    • B. 

      Base and OH-

    • C. 

      Log pH and log pOH

    • D. 

      H+ and pK

    • E. 

      Log [A-] and pH

  • 23. 
    What is the final pH of a solution with 50 mL of a stock solution of 2.0 M K2HPO4 and 25 mL of a stock solution of 2.0 M KH2PO4; diluted to a final volume of 200 mL. (pK=6.82;  log(1) = 0; log(2)=0.3; log(3)=0.48; log(5)=0.7).
    • A. 

      6.82

    • B. 

      6.52

    • C. 

      7.12

    • D. 

      5.82

    • E. 

      7.3

  • 24. 
    The free energy change for the reaction A => B at 25 degree C. Given enthalpy (kJ.mol-1) and entropy (J.K-1.mol-1) for A and B are: A enthalpy = 60; entropy = 22; B enthalpy = 75; entropy = 97.  Zero degree C = 273 Kelvin. Delta G = Delta H Ð T Delta S.
    • A. 

      -7.4 kJ.mol-1

    • B. 

      7.4 kJ.mol-1

    • C. 

      -3.7 kJ.mol-1

    • D. 

      3.7 kJ.mol-1

    • E. 

      None of the rest

  • 25. 
    A soccer coach keeps a couple of instant cold packs in her bag in case one of her players suffers a muscle injury. Instant cold packs are composed of a plastic bag containing a smaller water bag and solid ammonium nitrate. In order to activate the fold pack, the bag is kneaded until the smaller water bag breaks, which allows the released water to dissolve the ammonium nitrate. Which of the following statements about the dissolution of ammonium nitrate in water is correct?
    • A. 

      Delta G > 0

    • B. 

      Delta S > 0

    • C. 

      Delta H < 0

    • D. 

      Delta T > 0

    • E. 

      Delta H < Delta S