Essay about Biochem Quiz 2

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9/12/13

Quiz Submissions - Chapter_2_homework_water - Biochemistry Lecture I 800 - Springboard! - The University of Akron

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Quiz Submissions - Chapter_2_homework_water
Diem Nguyen (username: dtn6)
Attempt 3
Written: Sep 12, 2013 1:28 AM - Sep 12, 2013 1:36 AM

Submission View released: Aug 15, 2011 3:46 PM Question 1 2013: Hydrogen bond between water molecules are 0 / 1 point

A) attractions between two oxygen atom.

B) attractions between two hydrogen atoms.

C ) attractions between the H+ and OH– ions.

D) are ion-induced dipole attractions.

E) are dipole-dipole attractions.

Question 2 2013: Hydrogen bonds between water and solutes often are

1 / 1 point

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9/12/13

Quiz Submissions - Chapter_2_homework_water - Biochemistry Lecture I 800 - Springboard! - The University of Akron

A) between the oxygen atom of the water and a carbon atom on the solute.

B) between the oxygen on the water and nitrogen atom on the solute.

C ) between the hydrogen on the water and carbon atom on the solute.

D) between the hydrogen on the water and nitrogen atom on the solute.

E) between the hydrogen on the water and the hydrogen on the solute.

Question 3 2013: Weak acids:

1 / 1 point

A) are completely ionized in aqueous solution.

B) give solutions a high pH.

C ) do not provide hydronium ions.

D) are almost insoluble in water.

E) can be effective buffers.

Question 4 2013: Blood pH is affected by:

1 / 1 point

A) the reaction of C O 2 with H2 O to form carbonic acid

B) the ionization of aqueous carbonic acid to H+ and the bicarbonate anion

C ) the decrease of the blood pH due to the production of H+

D) the excretion of bicarbonate and ammonium from the kidneys

E) all of the above

Question 5 Which of the following statements about water is not true?

1 / 1 point

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Quiz Submissions - Chapter_2_homework_water - Biochemistry Lecture I 800 - Springboard! - The University of Akron

1)

The electron-rich oxygen atom of one water molecule can interact with the electron-poor proton on another water molecule to form a hydrogen bond.

2) Liquid water is only 15% less hydrogen bonded than ice. 3) Water is a nonpolar molecule that with a bent molecular geometry. 4) Water can form highly ordered, cage-like, structures around nonpolar molecules. 5) Water is a key player in the energetics of hydrophobic interactions. Question 6 Which of the following statements about water is incorrect? 1) Water is an excellent solvent for polar molecules. 2) Pure water has a concentration of approximately 55.5 M. 3) C ations are solvated by shells of water molecules oriented with their hydrogen atoms pointed toward the ions. 1 / 1 point

4) Nonpolar molecules do not dissolve in water, but form a separate phase. 5) Amphiphilic detergents often form micelles with the polar groups on the outside exposed to water (solvent) and the nonpolar groups sequestered in the interior. 1 / 1 point

Question 7 Which of the following statements about water is incorrect? 1) It is a small, polar molecule with a low dielectric constant. 2) It has a marked dipole moment. 3) 4) 5)

It is largely hydrogen bonded, although any single H-bond exists only for a very short period of time (~10- 1 2 s ). Acid-base reactions are very fast due to the mobility of hydronium ions in water which is a consequence of the ability of individual protons to “jump” from one water molecule to another. It has a bent geometry with each…