chapter 14 and 15 chem
Which of the following values for enthalpy of solution at 25ºC represents the greatest release of energy?
-3.59
The pH scale in general use ranges from
0-14
The pH of a solution is 10.00. What is its OH- concentration?
1.0 x 10^-4 M
What is the product of H3O+ ion and OH- ion concentrations in water?
10^-14
when the concentration is in water it is always
10^-14
Which expression represents the concentration of H3O+ ions in solution?
10^-14 ,(COMMA) [OH-]
What is the concentration of H3O+ ions in pure water?
10^-7 M
The ideal gas law combines Boyle's law, Charles's law, Gay-Lussac's Law and
Avogadro's Law
Which is a Lewis acid but not a Bronsted-Lowry acid?
BF3
Whose definition of acids and bases emphasizes the role of protons?
Bronsted-Lowry
Whose theory of acids and bases do conjugate acids and bases belong to?
Bronsted-Lowry
Which compound is produced by a neutralization?
H2O(l)
Which of the following is not an oxyacid?
H2O2
Which of the following is a triprotic acid?
H3PO4
Which of the following is chloric acid?
HClO3
Which of the following is perchloric acid?
HClO4
Whose acid definition is the broadest?
Lewis
An electron-pair donor is a
Lewis base
Whenever ammonia donates an electron pair to form a covalent bond, it acts as a(n)
Lewis base
The density of a substance undergoes the greatest change when the substance changes from a
Liquid to gas
Which of the following gases does not dissolve in atmospheric water to produce acidic solutions
O2
Which statement about Arrhenius acids is false?
They increase the concentration of hydroxide ions in aqueous solution
A standard solution always contains
a known concentration of solute
Bases react with
acids to produce salts and water
A species that can react as either an acid or a base is a(n)
amphoteric substance
A base is weak if its tendency to
attract a proton is slight
The name of a binary acid
begins with the prefix hydro-
Aqueous solutions of acids
carry electricity
What unknown quantity can be calculated after performing a titration?
concentration
When water is warmed from its freezing temperature to its temperature of maximum density, it
contracts
At its triple point, water can
exist in equilibrium in 3 different phases
When added to water, acids produce ________ ion in solution.
hydrogen
Which of the following is a molecular substance whose aqueous solution carries an electric current?
hydrogen chloride
An Arrhenius acid contains
hydrogen that ionizes to form hydrogen ions
What is the key substance found in all basic solutions?
hydroxide
When added to water, bases produce __________ ion in solution.
hydroxide
Dyes with pH-sensitive colors are used as
indicators
A conjugate acid is the species that
is formed by the addition of a proton to a base
What happens to the temperature of a substance when it is melting?
it remains the same
Which indicator is used to study neutralization of a strong acid with a weak base?
methyl orange
In a conjugate acid-base pair, the acid typically has
one more proton than the base
An acid-base titration is carried out by monitoring
pH
A Brønsted-Lowry base is a(n)
proton acceptor
Which of the following is not a reactant in a neutralization reaction?
salt
Which of the following is at equilibrium when undissolved solute is visible?
saturated solution
Pure water partially breaks down into charged particles in a process called
self-ionization
if a substance has a great tendency to give up protons, it's conjugate has a
slight tendency to attract protons
Which of the following is a homogeneous mixture of substances in a single phase?
solution
Glycerol boils at a slightly higher temperature than water. This reveals that glycerol's attractive forces are
stronger than those of water
if the temperature and the surface area of a liquid remain constant
the rate of evaporation remains constant
What process measures the amount of a solution of known concentration required to react with a measured amount of a solution of unknown concentration?
titration
Many organic compounds, such as codeine, that contain nitrogen are
weak bases
Which solute is present in aqueous solution mostly as molecules rather than as ions?
weak electrolyte
When titrating a weak acid with a strong base, the equivalence point
will be above a pH of 7.0