Water and pH Updated-BIOL-107
Water and pH Updated
Question 1
Bond that involves unequal sharing of a pair of electrons between atoms is
ionic
polar covalent
hydrogen bond
non-polar covalent
Question 2
A bond that involves the equal sharing of a pair of electrons between atoms
hydrogen bond
non-polar covalent
polar covalent
ionic
Question 3
The bonds that form between 2 hydrogens and an oxygen within a single water molecule are
ionic
non-polar covalent
hydrogen bonds
polar covalent
Question 4
A molecule formed by this type of bond tends to dissociate into ions when dissolved in water.
polar covalent
ionic
ionic
non-polar covalent
hydrogen bond
Question 5
The kind of bond that attracts one water moloecule to another is
ionic
hydrogen bond
polar covalent
non-polar covalent
Question 6
Which of the following are properties of water? (Check all that apply)
universal lubricant
universal solvent
is less dense as a solid than as a liquid
adhesive and cohesive
resists change of physical state
resists change of address
resists change of temperature
Question 7
Water molecules adhere to each other because of
hydrogen bonds between water molecules
salt bridges
salt bridges
solute ions
covalent bonds between water molecules
Question 8
Molecules like HCL that release H+ into solution are
acid
base
base
none of these
neutral
Question 9
A solution with more H+ than OH-
none of these
acid
acid
base
neutral
Question 10
A solution with more OH- ion than H+ ions
acid
none of these
neutral
base
Question 11
Pure water is ____________________.
acid
base
base
neutral
none of these
Question 12
A solution with pH 12
neutral
none of these
none of these
acid
base
Question 13
A solution with pH 7
base
acid
acid
none of these
neutral
Question 14
pH is determined by the concentration of which ion?
H+
Na+
Na+
Cl-
OH-
all ions
Question 15
At pH 3, the concentration of H+ ions is 1 x 10-3 molar
True
False
False
Question 16
At pH 3, the concentration of H+ ions is 10 times greater than at pH 4.
True
False
False
Question 17
In water, NaOH dissolves into the ions Na+ and OH-. When NaOH is added to pure water, the pH will
become neutral
stay the same
stay the same
go up
go down
Question 18
In water, Na Cl dissolves into Na+ and Cl-. When NaCl is added to pure water the pH will
go down
become neutral
go up
stay the same
Question 19
A buffer is a substance that makes any solution become neutral.
True
False
Question 20
You count 64 colonies on a plate that was created by spreading 0.1 mL of a 10^-5 culture on an agar plate. What is the OCD of the bacterial stock?
Hint: Use the formula OCD = CFU/ v x D
6.4 x 10^-6 CFU/ mL
6.4 x 10^6 CFU/ mL
6.4 x 10^6 CFU/ mL
6.4 x 10^-7 CFU/ mL
6.4 x 10^7 CFU/ mL
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