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L2 Water Part 1 of 2

Navigation   » List of Schools  »  West Los Angeles College  »  Chemistry  »  Chem 221 – Biochemistry for Science Majors  »  Fall 2021  »  L2 Water Part 1 of 2

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Below are the questions for the exam with the choices of answers:

Question #1
The total number of hydrogen bonds of a water molecule is 
A  2
B  4
C  3
D  2
Question #2
Water has a 
A  tetrahedral geometry
B  trigonal planar geometry
C  it varies
D  linear geometry
Question #3
Intramolecular forces are weaker than intermolecular forces
A  FALSE
B  TRUE
Question #4
Of the non covalent interactions, the weakest is
A  hydrophobic interactions
B  hydrogen bonding
C  ionic bonds
Question #5
Of the non covalent interactions, the strongest is
A  ionic bonding
B  hydrogen bonding
C  hydrophobic interactions
Question #6
The ionization of water is irreversible
A  FALSE
B  TRUE
Question #7
The degree of ionization of water to hydrogen ions (H+) and hydroxide ions (OH-) is considered 
A  large
B  small
Question #8
Sulfuric acid is a weak acid.
A  FALSE
B  TRUE
Question #9
If the pKa of acid A is 2 and the pKa of acid B is 4, that means that 
A  A is 100 weaker than B
B  A is 200 stronger than B
C  A is 100 stronger than B
Question #10
When you add an acid or a base to water, the product of [H+] and  [OH-]  changes. 
A  TRUE
B  FALSE
Question #11
Many biochemical molecules are either weak acids or weak bases.
A  TRUE
B  FALSE
Question #12
Acetic acid has has two pKas.
A  TRUE
B  FALSE
Question #13
Sodium hydroxide is a strong base.
A  FALSE
B  TRUE
Question #14
Acetic acid is a strong acid.
A  FALSE
B  TRUE
Question #15
A molecule change its ionization state by gaining or losing a proton (H+).
A  FALSE
B  TRUE
Question #16
Each acid has a characteristic tendency to lose its proton in an aqueous solution. The weaker the acid, the greater its tendency to lose its proton.
A  FALSE
B  TRUE
Question #17
In a phospholipid bilayer, the hydrophilic heads are exposed to outside water molecules while the hydrophobic tails inside the bilayer.
A  TRUE
B  FALSE
Question #18
Hydrogen ions (H+) formed in the dissociation of water are immediately hydrated to hydronium ions (H3O+).
A  FALSE
B  TRUE
Question #19
In any aqueous solution at 25 °C, no matter what it contains, the product of [H+] and [OH-] must always equal 1.0 x 10-7.
A  FALSE
B  TRUE
Question #20
If NaOH(s) is dissolved in water, increasing the [OH-], the [H+] must decrease.
A  TRUE
B  FALSE
Question #21
Adding an acid to pure water decreases the [H3O+]
A  FALSE
B  TRUE
Question #22
Adding an acid to pure water decreases the [OH-]
A  FALSE
B  TRUE
Question #23
When crystalline substances (salts) dissolve in water, they acquire greater freedom of motion, which decreases the entropy of the system.
A  TRUE
B  FALSE
Question #24
For a weak acid, low pKa means high dissociation.
A  FALSE
B  TRUE
Question #25
The pKa of acid A is 4.5 and the pKa of acid B is 7.2. Acid B is a stronger acid than A.
A  TRUE
B  FALSE
Question #26
If an ion for which the cell membrane does not have a transport protein is injected into the blood in significant amounts, which of the following would occur?
A  The blood cells would swell and eventually burst
B  The blood cells would shrivel due to osmotic movement of water out of the cell
C  The volume of the blood would decrease
D  The speed of blood flow through the vessels would increase
E  Blood proteins would diffuse into the cells to compensate
Question #27
Salt dissolves well in water as water molecules
A  surround the ions because of their charge but do not form hydrogen bonds
B  share electrons with the ions to make polar covalent bonds
C  make nonpolar covalent bonds with the positively charged ions only
D  form hydrogen bonds with the positively and negatively charged ions
Question #28
The aqueous solution with the lowest pH is:
A  1 M acetic acid (pKa = 4.86)
B  1 M formic acid (pKa = 3.75)
C  1 M HCl
D  2 M HCl
E  10–12 M NaOH
Question #29
A hydride ion:
A  contains two protons and two electrons and has the structure H-
B  contains two protons and two electrons and is the anion of hydrogen
C  has the structure H-, is the anion of hydrogen, and contains one protons and two electrons
Question #30
A hydronium ion:
A  is a hydrated proton
B  is the usual form of one of the dissociation products of water in solution
C  is a hydrated hydrogen ion
D  has the structure H3O+
E  All of the above are true
Question #31
Osmosis is movement of a:
A  charged solute molecule (ion) across a membrane
B  water molecule across a membrane
C  polar solute molecule across a membrane
D  gas molecule across a membrane
E  nonpolar solute molecule across a membrane
Question #32
The three-dimensional structure of macromolecules is formed and maintained primarily through non-covalent interactions. Which one of the following is not considered a non-covalent interaction?
A  Hydrophobic interactions
B  Carbon-carbon bonds
C  Ionic interactions
D  van der Waals interactions
E  Hydrogen bonds
Question #33
Weak acids generally have pKa
A  values less than 1
B  values greater than 2
C  been seldom found in living systems
D  that cannot be used to buffer
Question #34
The dissociation constant of H2O at 25° C is
A  10^-7 M
B  10^-14 M
C  10^7 M
D  10^14 M
Question #35
The lone pair electrons on oxygen in a H2O molecule
A  carry a partial positive charge
B  carry a partial negative charge
C  are not important for the properties of water
D  form covalent bonds in ice
Question #36
A solution with pH = 5 is __________ than a solution with pH = 7.
A  10 times more basic
B  10 times more acidic
C  2 times more basic
D  100 times more acidic
Question #37
With respect to hydrogen bonds,
A  water does not have to be involved
B  they are what make peptide bonds
C  they are stronger than covalent bonds
D  they are stronger than disulfide bonds
Question #38
Which of the following alcohols would be most soluble in water?
A  butanol
B  methanol
C  octanol
D  ethanol
Question #39
Which one of the following functional groups does not participate in hydrogen bonding?
A  Hydroxyl
B  Methyl
C  Amido (amide)
D  Carboxyl
E  Amino
Question #40
A compound contains hydroxyl groups as its predominant functional group. Which of the following statements is true concerning this compound?
A  It lacks a hydrogen, so it acts as an acid
B  It won’t form hydrogen bonds with water
C  It should dissolve in a nonpolar solvent
D  It is hydrophobic
E  It should dissolve in water
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