Water and pH Updated-BIOL-107

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

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

solute ions

covalent bonds between water molecules

Question 8
Molecules like HCL that release H+ into solution are

acid
base

none of these

neutral

Question 9
A solution with more H+ than OH-

none of these
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

neutral

none of these

Question 12
A solution with pH 12

neutral
none of these
acid

base

Question 13
A solution with pH 7

base
acid

none of these

neutral

Question 14
pH is determined by the concentration of which ion?

H+
Na+

Cl-

OH-

all ions

Question 15
At pH 3, the concentration of H+ ions is 1 x 10-3 molar

True
False

Question 16
At pH 3, the concentration of H+ ions is 10 times greater than at pH 4.

True
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

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^-7 CFU/ mL

6.4 x 10^7 CFU/ mL

Water and pH Updated-BIOL-107
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