The rising of liquids in narrow tubes against the force of gravity is called
- capillary action
- cohesion
- specific elasticity
- surface tension
- viscosity
capillary action
procaine hydrochloride (M = 272.8g/mol) is used as a local
anesthetic. Calculate the molarity of a 2.51 m solution of procaine
hydrochloride in water which has a density of 1.057 g/mL
- 1.98 M
- 1.58 M
- 1.87 M
- 1.67 M
- 1.15 M
1.58 M
Examine the following phase diagram and identify the phase change
occurring as one goes from point D to point F.
- deposition caused by increasing the temperature
- sublimation caused by increasing the temperature
- condensation caused by increasing the temperature
- melting caused by increasing the temperature
- vaporization caused by increasing the temperature
sublimation caused by increasing the temperature
the band gap between the valence and conduction bands of semiconductors
- is large
- is non-existent
- decreases with increasing temperature
- is relatively small
- increases with increasing temperature
is relatively small
which of the following substances will have hydrogen bonds between
the molecules?
- CH3SH
- CH3NH2
- CH3CH2Cl
- (CH3)2O
- HCl
CH3NH2
From the following list of aqueous solutions and water, select the
one with the highest boiling point. (Note: Use the ideal values of the
van't Hoff factor.)
- 0.37 M AlBr3
- 0.74 M SrBr2
- 0.95 M NaBr
- 0.57 M Na2S
- pure water
0.74 M SrBr2
The boiling point of the molecular compound A is
55.2�C. How much energy is needed to heat 17.5 g of A
from 12.5�C to 91.8�C?
Specific heat capacity of A(l
)
3.52 J/(g?K)
Specific heat capacity of A(g )
2.11 J/(g?K)
Heat of vaporization of A
45.7 kJ/mol
Molar mass of A
30.4 g/mol
- 28.6 kJ
- 34.0 kJ
- 38.8 kJ
- 30.3 kJ
- 41.1 kJ
30.3 kJ
The Henry's Law constant for carbon monoxide in water at 25�C is
9.71�10-4 mol/L�atm. How many moles of CO will dissolve in
1.00 L of water at this temperature if the partial pressure of CO is
382.1 torr?
- 0.00193 mol
- 0.000628 mol
- 0.000488 mol
- 0.000555 mol
- 0.371 mol
0.000488 mol
A compound has vapor pressure of 29.5 torr at 41.7�C and 441.0 torr
at 141.0�C. Calculate its heat of vaporization.
- 29.5 kJ/mol
- 25.8 kJ/mol
- 31.4 kJ/mol
- 36.5 kJ/mol
- 40.3 kJ/mol
29.5 kJ/mol
Which of the following statements is correct?
- Raoult's Law applies exactly to all solutions.-
- Raoult's Law relates the vapor pressure of the solvent above the
solution to the molarity of the solution.
- Raoult's Law relates the vapor pressure of the solvent above the
solution to its mole fraction in the solution.
- Raoult's Law applies only to non-ideal solutions.
- Raoult's Law works best when applied to concentrated solutions.
Raoult's Law relates the vapor pressure of the solvent above the
solution to its mole fraction in the solution.
Determine the freezing point of a solution which contains 0.39 mol of
sucrose in 93 g of water. (For water K f
= 1.86�C/m and K b = 0.512�C/m)
- -2.1?C
- -7.8?C
- 0.0? C
- 2.1?C
- 7.8?C
-7.8?C
Which of the following statements is correct?
- all of these statements are correct
- a solution becomes saturated when no more solute can be dissolved
- a solution becomes unsaturated when the solute precipitates in it
- none of these statements are correct
- supersaturated solutions are quite stable
a solution becomes saturated when no more solute can be dissolved
What is the coordination number for a metal that crystalizes in the
face-centered cubic lattice?
- 4
- 2
- 8
- 6
- 12
12
Which of the following should have the highest boiling point?
- CH3CH3
- CH3SCH3
- CH3TeCH3
- CH3OCH3
- CH3SeCH3
CH3TeCH3
Which of the following pairs of ions is arranged so that the ion with
the smaller (i.e. less negative) heat of hydration is listed first?
- Al3+, Mg2+
- Ca2+, K+
- None of the above pairs are arranged in this way
- Sr2+, Ca2+
- S2�, Se2�
Sr2+, Ca2+
Which of the following statements is correct with regard to the
following two solutions? (Note: Use the ideal values of the van't Hoff factor.)
(I) 0.52 m RbCl and
(II) 0.21 m CaCl2
- Solution (I) has lower osmotic pressure
- The two solutions have the same vapor pressure
- Solution (I) has lower vapor pressure and lower osmotic pressure
- Solution (I) has higher osmotic pressure.
- Solution (II) has lower vapor pressure
Solution (I) has higher osmotic pressure.
A metal with a simple cubic lattice will have ________________
atom(s) per unit cell.
- 8
- 1
- 4
- 6
- 2
1
The heat needed to worm up a liquid depends on
- its vapor pressure
- its heat capacity
- the heat capacity of its vapors
- the value of the gas constant, R
- its normal boiling point
its heat capacity
An aqueous solution contains 3.77 g of the unknown compound X. The
volume of the solution is 895.0 mL and its osmotic pressure is 2.85
atm at 25.0�C. Assuming that X is a nonvolatile nonelectrolyte, what
is the molar mass of this compound?
- 36.2 g/mol
- 30.5 g/mol
- 27.9 g/mol
- 33.7 g/mol
- 50.4 g/mol
36.2 g/mol
What is the molality of a solution prepared by dissolving 13.3 g of
hexane, C6H14, in 71.0 g of benzene, C6H6?
- 2.17 m
- 1.57 m
- 2.57 m
- 2.05 m
- 2.74 m
2.17 m
- rate = k
- rate = k[A]2
- rate = k[B]2
- rate = k[A]2[B]2
- rate = k[A][B]
rate = k[A]2[B]2
Which of the following statements about the reaction quotient, Q, and
the equilibrium constant, K, is true?
- Q can not be affected by the total pressure.
- K is affected by the presence of a catalyst but Q is not.
- At equilibrium Q reaches a maximum.
- Q and K are basically the same thing.
- K is related to the rate constants of the forward and reverse reactions.
K is related to the rate constants of the forward and reverse reactions.
At 25oC, the equilibrium constant, for the reaction
3A(g) ? B(g) + C(g)is K
c = 670.0. What is the value of Kp?
(R = 0.08206 L?atm/mol?K)
- 22.6
- 27.4
- 31.4
- 20.9
- 19.4
27.4
The equilibrium constant, K c , for the reaction
2A(g) + B(g) ? 2C(g) + D(g)
is 6.94 at a certain temperature. What is the equilibrium constant
for the following reaction at the same temperature?
C(g) + 1/2 D(g) ? A(g) + 1/2 B(g)
- 3.47
- 0.0208
- 0.380
- 0.443
- 1.86
0.38
Consider the following reaction4A(g) + 4B(g)
? 8C(g) + 5D(g)
If [A] is decreasing at the rate of 1.59 mol
L-1s-1, at what rate is [D] changing?
- 1.77 mol L-1s-1
- 1.42 mol L-1s-1
- 1.99 mol L-1s-1
- 2.98 mol L-1s-1
- 1.14 mol L-1s-1
1.99 mol L-1s-1
Consider the following reaction. 2A(g) + B(g) ? 4C(g)
?H�rxn = �84 kJ/molUnder which reaction conditions
would you expect to have the greatest equilibrium yield of C(g)?
- low temperature, high pressure
- high temperature, low pressure
- high temperature, high pressure
- low temperature, low pressure
- none of the above, unless a catalyst is present
low temperature, low pressure
What is the mass-action expression, Kc
, for the following chemical reaction?
PbO(s) + CO(g) ? Pb(l) + CO2(g)
- none of the above expressions is correct
- [CO2]/[CO]
- [Pb][CO2]/[PbO][CO]
- [Pb][CO2]/[CO]
- [CO]/[CO2]
[CO2]/[CO]
Compound A decomposes to B and C according to the following equation:
2A(g) ? B(g) + 2C(g)At 100�C,
1.61 mol of A were placed in a 5.50 L container, and the reaction was
allowed to proceed. After equilibrium was established, it was found
that 66.6 % of A had decomposed. What is the value of K
c for this reaction at 100�C?
- 0.363
- 0.388
- 0.281
- 0.454
- 0.498
0.388
The rate law for the reaction 2A ? B + C is rate =
k[A]2 with a rate constant k = 0.3765 L
mol-1 s-1. If the initial concentration of A is
0.591 mol/L, calculate its concentration 1.69 seconds after the start
of the reaction.
- 0.420 mol/L
- 0.462 mol/L
- 0.553 mol/L
- 0.593 mol/L
- 0.514 mol/L
0.420 mol/L
When solid magnesium hydroxide is added to water, part of it
dissociates into magnesium and hydroxide ions.
Mg(OH)2(s) ? Mg2+(aq) + 2OH�(aq)
If the above reaction is at equilibrium at a certain temperature,
what would be the effect of adding a small amount of magnesium ions to
the solution?
- The solution will become supersaturated.
- The forward reaction will proceed to establish equilibrium.
- The reverse reaction will proceed to establish equilibrium.
- None of the above conclusions is justified without additional information.
- No effect.
The reverse reaction will proceed to establish equilibrium.
The the units of the rate constant for the reaction A + B ? C + D are
L2 mol-2 s-1. What is the overall
order of the reaction?
- first
- none of the above
- zero
- second
- third
third
If the activation energy of a certain chemical reaction is 31.3
kJ/mol, by what factor will the rate of this reaction increase when
the temperature is increased from 32 oC to 64
oC? (R = 8.314�10-3 kJ/mol?K)
- 3.48
- 2.35
- 3.23
- 3.81
- 2.49
3.23
When the reaction A ? B + C is studied, a plot of 1/[A] versus time
gives a straight line with a positive slope. What is the the order of
the reaction?
- first
- third
- second
- more information is needed to determine the order
- zero
second
At a certain temperature, the equilibrium constant for the
reaction 2NaHCO3(s) ?
Na2CO3(s) + H2O(g)
+ CO2(g)is K p
= 0.320. If a sufficient quantity of
NaHCO3(s) is placed in a closed container at this
temperature, what would be the partial pressure of water vapor after
equilibrium is established?
- 0.766 atm
- 0.566 atm
- 0.473 atm
- 0.531 atm
- 0.715 atm
0.566 atm
At 25oC, the equilibrium constant for the
reaction 3A(g) ? B(g) + C(g)is
Kp = 0.0598. If the three gases are
mixed in a rigid container having partial pressures of 2.26, 1.19 and
0.266 atm for A, B and C, respectively, is the system at equilibrium?
- the reverse reaction must proceed to establish equilibrium
- the forward reaction must proceed to establish equilibrium
- the volume of the container must be known to answer the question
- the concentrations of all substances must be known to answer
the question
- the system is at equilibrium
the forward reaction must proceed to establish equilibrium
Which of the following statements is true?
- A catalyst accelerates a reaction by changing the reaction pathway.
- A catalyst accelerates a reaction by supplying energy to the
reactant molecules.
- A catalyst accelerates a reaction by increasing the number of
molecular collisions.
- A catalyst accelerates a reaction by increasing its
activation energy.
- A catalyst accelerates a reaction and is consumed in it.
A catalyst accelerates a reaction by changing the reaction pathway.
A particular radioactive isotope undergoes a first order decay with a
half-life of 25.1 years. How long would it take for the concentration
of this isotope to drop to 53.6 % of its original value?
- 30.9 years
- 29.3 years
- 24.8 years
- 26.3 years
- 22.6 years
22.6 years
The experimental rate law for the reaction 2A + 2B ? D + E is
Rate =
k[A]2 [B]2. Which of
the following statements is correct for the mechanism suggested
below? 2A + B ? 3C + D (slow) 3C + B ? E (fast)
- none of the above is correct
- the mechanism should only have a single step
- the mechanism is not consistent with the rate law
- The mechanism is consistent with the rate law but it is not
physically reasonable
- The mechanism is consistent with the rate law and it is
physically reasonable
the mechanism is not consistent with the rate law
The rate law for the reaction A ? B is rate = k[A]
with a rate constant of 2.70 s-1. If the initial
concentration of A is 0.632 mol/L, what is the half-life of the reaction?
- 0.326 s
- 0.092 s
- 0.586 s
- 0.117 s
- 0.257 s
0.257 s
At a certain temperature, the equilibrium constant for the
reaction CO2(g) + H2(g)
? CO(g) + H2O(g)is K
c = 3.98. If 2.00 mol of CO2 and 2.00
mol of H2 are placed in a 2.00 L vessel and equilibrium is
established, what will be the concentration of water?
- 0.922 M
- 0.792 M
- 0.531 M
- 0.703 M
- 0.666 M
0.666 M
Which of the following acids and its conjugate base should be used to
prepare an efficient buffer with a pH = 4.0? (1)
HClO2, K a = 1.1�10-2
(2) CH3COOH, K a = 1.8�10-5
(3) HClO, K a = 2.9�10-8
- 1
- 3
- 2
- both 2 and 3 would be fine
- both 1 and 2 would be fine
2
What is the pH of a 1.9�10�5 M Ca(OH)2 solution?
- 8.96
- 9.28
- 10.77
- 9.58
- 11.36
9.58
What is the pK a of the alkylammonium ion
R3NH+? (K b =
4.6�10�5 for R3N)
- 9.66
- 3.68
- 5.55
- 4.34
- 9.07
9.66
The organic acid RCOOH has a pKa = 4.14. What is the pH of
a 0.40 M aqueous solution of this acid?
- 3.15
- 2.27
- 2.09
- 2.88
- 1.96
2.27
Sodium nitrite, NaNO2, is best known as a food additive.
What is the pH of a 0.350 M NaNO2 solution in
water? (K a of HNO2 is equal to 7.1�10-4)
- 7.00
- 5.65
- 8.35
- 5.15
- 8.61
8.35
Calculate the molar solubility of barium sulfate, BaSO4,
in 0.34 M BaCl2 solution. (K
sp = 1.1�10-10 for BaSO4)
- 1.9e-10 M
- 6.2e-11 M
- 2.4e-9 M
- 3.2e-10 M
- 9.1e-11 M
3.2e-10 M
Select the pair of substances in which an acid is listed followed by
its conjugate base.
- NH4 +, NH2 �
- H2CO3, CO3 2-
- H+, HF
- H3PO4, HPO4 2�
- HCO3 �, CO3 2-
HCO3 �, CO3 2-
Calculate the molar solubility of Fe(OH)2 in pure water.
(K sp = 4.1�10�15)
- 1.6e�5 M
- 6.4e�8 M
- 1.1e�4 M
- 5.2e�4 M
- 1.0e�5 M
1.0e�5 M
A solution is prepared by adding 0.034 mol of NaCl to 1.00 L of
0.0114 M Pb(NO3)2. Which of the
following statements is correct? (K sp =
1.7�10-5 for PbCl2)
- The solution is unsaturated and no precipitate forms.
- Both sodium nitrate and lead(II) chloride precipitate.
- Lead(II) chloride precipitates until the solution is saturated.
- Sodium nitrate precipitates until the solution is saturated.
- The data is not sufficient to predict precipitation.
The solution is unsaturated and no precipitate forms.
An aqueous solution of NH4Cl would be
- either acidic or basic depending on the amount of salt dissolved.
- neutral
- either acidic or basic depending on the actual values of
K a and K b which must be known.
- acidic
- basic
acidic
The species NH3 is classified as a(n)
- none of the above
- Lewis acid
- Arrhenius base
- Arrhenius acid
- Lewis base
Lewis base
A 0.41 M solution of a given weak acid, HA, has a
pH of 4.81. What is the pKa of the acid?
- 12.66
- 8.67
- 7.97
- 11.55
- 9.23
9.23
What is the pH of a buffer that consists of 0.32 M HClO and
0.67 M NaClO? (K a(HClO) =
2.9�10�8) - 7.17
- 10.98
- 10.13
- 9.16
- 7.86
7.86
The acid ionization constant of H2SO3 is
K a = 1.4�10�2 and that of HClO is
K a = 2.9�10�8. Which statement about
the equilibrium below is correct?
H2SO3(aq) +
ClO�(aq) ? HSO3 �
(aq) + HClO(aq)
- The initial concentrations of the reactants must be known
before any prediction can be made.
- The reactants will be favored at equilibrium.
- Neither reactants nor products will be favored because all of
the species are weak acids or bases.
- The products will be favored at equilibrium.
- Neither reactants nor products will be favored because the
reaction is impossible.
The products will be favored at equilibrium.
When a strong base is titrated with a strong acid, the pH at the
equivalence point is
- strongly acidic
- neutral
- slightly acidic
- slightly basic
- strongly basic
neutral
Which of the following arrangements has the strongest acid listed
first and the weakest acid listed last?
- H3N > HF > H2O
- HF > H2O > H3N
- H2O > HF > H3N
- HF > H3N > H2O
- H2O > H3N > HF
HF > H2O > H3N
A particular acid-base indicator has an acid ionization constant,
K In = 6.4�10�9. What would be the
approximate pH range over which it changes color?
- 7.2-92
- 8.2-10.2
- 5.2-7.2
- 4.2-6.2
- 6.2-8.2
7.2-9.2
A solution is prepared by adding 2.6 mol of KCN to 1.00 L of 0.30
M Zn(NO3)2. What is the equilibrium
concentration of Zn2+ ions? (K f =
4.2�1019 for Zn(CN)4 2-)
- 2.0e-22 M
- 1.4e�20 M
- 1.9e�21 M
- 6.2e�21 M
- 1.1e�20 M
1.9e�21 M
Calculate the pH during the titration of 34.0 mL 0.103
M formic acid (pKa = 3.74) with 0.110
M NaOH after the addition of 17.0 mL of the titrant.
- 3.52
- 3.28
- 3.80
- 4.21
- 3.94
3.8
Which, if any, of the following aqueous mixtures would be buffer systems?
(1) HNO2 , KH2PO4
(2) H2SO3 , NaHSO3
- 1 is a buffer but 2 is not
- neither 1 nor 2 are buffers
- none of above
- 2 is a buffer but 1 is not
- both 1 and 2 are buffers
2 is a buffer but 1 is not
How long would it take to deposit 8.43 g of copper (molar mass 63.55
g/mol) at the cathode of an electrolytic cell, if a current of 14.7 A
is passed through an aqueous solution of CuSO4?
- 38.7 min
- 44.8 min
- 29.0 min
- 24.0 min
- 25.5 min
29.0 min
- 19.8 kJ
- 45.7 kJ
- -67.2 kJ
- -45.7 kJ
- 19.8 kJ
45.7 kJ
Predict the sign of ?So for the following reaction.
C2H5OH (l) +
3O2(g) ? 2CO2 (g) +
3H2O (l)
- ?S? > 0
- ?S? ? 0
- More information is needed to make a reasonable prediction.
- ?So < 0
- ?So could be positive or negative
depending on the sign of ?H�.
?So < 0
Consider the following redox equation MnO4
�(aq) + ClO3 �(aq)
? Mn2+(aq) + ClO4
�(aq) (acidic solution)When the equation is
balanced with smallest whole number coefficients, what is the
coefficient of the permanganate ion?
- 3
- 4
- 1
- 2
- 5
2
If Eo cell = 0.30 V for the reaction
below at 25oC, what is the value of the equilibrium
constant at this temperature.
Sn2+ (aq) + Fe(s) ?
Fe2+ (aq) + Sn(s)
- 2.2e0
- 7.3e-11
- 1.0e0
- 1.4e10
- 1.2e5
1.40E+10
Use the table of standard reduction potentials attached to your test
to calculate Eo cell for the following
reaction and determine if it is spontaneous at standard conditions.
Ca2+ (aq) + Cd(s) ? Cd2+
(aq) + Ca(s)
- Eo cell = �2.47 V, spontaneous
- Eo cell = 2.47 V, spontaneous
- Eo cell = �3.27 V, non-spontaneous
- Eo cell = 2.47 V, non-spontaneous
- Eo cell = �2.47 V, non-spontaneous
Eo cell = �2.47 V, non-spontaneous
Which, if any, of the following two elements can be isolated by
electrolysis of the the aqueous salt shown? (1) Ni from
NiSO4 (aq) (2) Br2 from NaBr(aq)
- Neither (1) nor (2) can be isolated.
- Both (1) and (2) can be isolated.
- (1) can not be isolated but (2) can be isolated
- (1) can be isolated but (2) can not be isolated.
Both (1) and (2) can be isolated.
- 0.244 V
- -0.244 V
- 0.220 V
- -0.440 V
- 0.440 V
0.244 V
For a given chemical reaction, ?? > 0 and ?S
< 0. Therefore,
- The reaction is spontaneous only at high temperatures.
- The reaction is non-spontaneous at all temperatures.
- The reaction is spontaneous only at low temperatures.
- The reaction is spontaneous at all temperatures.
The reaction is non-spontaneous at all temperatures.
For the reaction below, ?Go = 24.0 kJ/mol at 989
K. If at 989 K, an excess of the solid A(s) is added to the
gases B(g) and C(g) both having partial pressures of
0.76 atm, which statement is true? A(s) ?
2B(g) + 2C(g)
- The reverse reaction will proceed spontaneously.
- The reaction will be at equilibrium.
- The reaction quotient will become negative.
- The equilibrium constant will increase.
- The forward reaction will proceed spontaneously.
The reverse reaction will proceed spontaneously.
Which one of the following statements about electrochemical cells is correct?
- The free energy change is negative for an electrolytic cell.
- The cathode is labeled as negative (-) in a voltaic cell but
positive (+) in an electrolytic cell.
- Reduction occurs at the cathode of both galvanic and
electrolytic cells.
- In the salt bridge cations travel toward the anode and anions
toward the cathode.
- None of the above statements is correct.
Reduction occurs at the cathode of both galvanic and electrolytic cells.
A galvanic cell consists of an Au/Au3+ electrode
(Eo = +1.50 V) and a Ag/Ag+ electrode
(Eo = +0.80 V). Calculate the cell potential,
E cell, at 25oC if [Au3+] =
6.9�10�7 M and [Ag+] =
3.6�10�4 M.
- 0.73 V
- 0.81 V
- 0.70 V
- 0.78 V
- 0.89 V
0.78 V
- 657.3 J/K
- 46.1 J/K
- -277.6 J/K
- 277.6 J/K
- -46.1 J/K
- 277.6 J/K
Which of the following relationships best describes
?So for the following reaction.
HCl (g) ? H+(aq) + Cl- (aq)
- ?So ? 0
- ?So > 0
- More information is needed to make a reasonable prediction.
- ?So = T?H�
- ?So < 0
?So < 0
Examine the table of standard reduction potentials attached to your
test and determine which of the following species is the strongest
oxidizing agent?
- Sn2+ (aq)
- Sn(s)
- Sn4+ (aq)
- Au3+ (aq)
- NO3 � (aq)
Au3+ (aq)
- 521.4 K
- 718.9 K
- 454.6 K
- 591.1 K
- 269.9 K
591.1 K
Which of the following should have the greatest molar entropy at 298 K?
- Cl2 (aq)
- F2 (g)
- Cl2 (g)
- all should have the same molar entropy since the temperature
is constant
- F2 (aq)
Cl2 (g)
For the reaction below, ?Hr
o = 178.5 kJ/mol and
?Sr o = 159.0
J/mol?K at 298 K. What is the equilibrium constant of this reaction
at 572.0 K? CaCO3 (s) ? CaO(s) +
CO2 (g)
- 1.9e-8
- 7.0e-9
- 1.0e-8
- 8.4e-9
- 6.2e-9
1.00E-08
A galvanic cell has the following notation:
Sn(s) | Sn2+(aq) ||
Fe3+(aq), Fe2+(aq) | Pt(s)
Which of the following equations correctly represents the
overall cell reaction?
- Sn(s) + Fe2+(aq) ?
Sn2+(aq) + Fe3+(aq)
- Sn2+(aq) + Fe2+(aq)
? Sn(s) + Fe3+(aq)
- Sn(s) + 2Fe3+(aq) ?
Sn2+(aq) + 2Fe2+(aq)
- Sn2+(aq) + 2Fe3+(aq)
? Sn(s) + 2Fe2+(aq)
- Sn(s) + Fe3+(aq) ?
Sn2+(aq) + Fe2+(aq)
Sn(s) + 2Fe3+(aq) ?
Sn2+(aq) + 2Fe2+(aq)
Which, if any, of the following three metals could be used as
sacrificial anodes for protection of a metal with E� = 0.93
V? (All E� values refer to the M3+/M half-cell
reactions.) (1) gold, Au, E� = +1.50 V (2)
chromium, Cr, E� = -0.74 V (3) aluminum, Al,
E� = -1.66 V
- none of them could be used
- only (3) could be used
- all three of them could be used
- only (1) and (2) can be used
- only (2) and (3) could be used
only (2) and (3) could be used