Physical Chemistry

Question 1

An ideal gas will only be considered in the
following operating parameters:
a. High Temperature, High Pressure
b. High Temperature, Low Pressure
c. Low Temperature, High Pressure
d. Low Temperature, Low Pressure

Answer 1

b

Question 2

Which ofthe following isfalse regarding absolute
zero?
a. All molecules will stop moving
b. Absolute zero can be achieved
c. Temperature is 0K
d. Temperature is 0R

Answer 2

b

Question 3

For a real gas, what causes the deviation from
the ideal pressure at a molecular level?
a. Energy is lost for each collision against
the sides of the container
b. Energy is lost due to the collision of
molecules with one another
c. Intermolecularforces of attraction of the
molecules with one another
d. Molecules randomly hit the sides of the
wall with less force than usual

Answer 3

c

Question 4

When gas molecules collide, they experience
collision.

Answer 4

Perfectly Elastic

Question 5

Which of the following is false with KMT?
a. Gas molecules move in random motion
b. Due to collision of gas molecules with
each other, some kinetic energy is lost
c. The temperature of the whole system
does not change with time
d. The size of the molecules are negligible

Answer 5

b

Question 6

This is the pressure exerted by the gas molecules
that are in equilibrium with the liquid

Answer 6

Vapor pressure

Question 7

The internal energy of an ideal gas depends on:

Answer 7

absolute temperature

Question 8

Which of the following is a characteristic of an
adiabatic process?
a. ΔU=0 c. Q=0
b. W=0 d. ΔV=0

Answer 8

c

Question 9

A sample of an ideal gas has an internal energy
of U and is then compressed to ½ of its original
volume while the temperature stays the same.
What is the new internal energy of the ideal gas
in terms of U?
a. U c. U/4
b. U/2 d. 2U

Answer 9

a

Question 10

Which of the following is not conserved in any
process?
a. Mass c. Momentum
b. Energy d. Entropy

Answer 10

d

Question 11

An isentropic process is:
a. Isothermal and adiabatic
b. Reversible and isothermal
c. Reversible and adiabatic
d. Reversible and isochoric

Answer 11

c

Question 12

Increasing the temperature of the cold reservoir
the Carnot efficiency.

Answer 12

decreases

Question 13

If the entropy of a system decreases,the entropy
of its surroundings
a. Must always increase
b. Must always decrease
c. May increase or decrease
d. Not enough information to answer the
question

Answer 13

a

Question 14

The amount of heat absorbed when CO2 gas
reacts with a solid CaO to form solid CaCO3 is
measured in a bomb calorimeter. The data
obtained give a direct measure of:

Answer 14

internal energy

Question 15

Heat required to raise the temperature of 1lbm
of water by 1˚F

Answer 15

BTU

Question 16

Which of the following statements is/are true?
1. The criterion of equilibrium at constant
temperature and pressure is dG=0.
2. For a reversible process, dS=dQ/T.

Answer 16

both 1 & 2

Question 17

The equilibrium intensive state of a system is
described by specifying the temperature,
pressure, and:

Answer 17

Mole fractions

Question 18

The general statement of the Third Law of
Thermodynamicsis attributed to:

Answer 18

Walther Nernst

Question 19

The fugacity of a real gas is equal to:
a. The pressure of an ideal gas which has
the same chemical potential as the real
gas
b. The pressure of a real gas which has the 𝑑𝐻 = 𝐶
same chemical potential as the ideal gas 𝜕𝑉
c. The chemical potential of an ideal gas
which has the same pressure as the real
gas
d. The chemical potential of a real gas
which hasthe same pressure as the ideal
gas

Answer 19

a

Question 20

An adiabatic process is one in which the system
under investigation is thermally isolated so that
there is no exchange of heat with the
surroundings. Thus, the work done on a closed
system in an adiabatic process is _.
a. Equal to zero
b. Not equal to the exchange of heat with
surroundings
c. Equal to the increase in internal energy
of the system
d. Not equal to the increase in internal
energy of the system

Answer 20

c

Question 21

State Le Chatelier’s Principle.
a. Le Chatelier’s principle states that when
a stress is placed on a system in
equilibrium, the system tends to change
in a way that relieves the stress.
b. All of these
c. Examples of the application of Le
Chatelier’s principle are blowing your
breath through a straw and dissolving
alka seltzer tablet in a glass of water.
d. Le Chatelier’s principle explains both the
formation and decomposition of acids,
where anything that might act to
increase the concentration of an acid
would produce an increase in the other
components so as to keep the numerical

Answer 21

a

Question 22

A certain gas confined in a cylinder by a piston,
where the initial pressure in the system is 7 bar
and the volume is 0.11 cubic meter. The piston is
held in place by latches and the apparatus is in
vacuum. Determine the change in energy when
the latches are removed suddenly and the gas
expands to double its initial volume and the
piston strikes the latches at the end of the
process.

Answer 22

no change

Question 23

Determine which of the following occurrences
tells us what happens when Le Chatelier’s
principle is applied whether these are true or
false.
1. The addition of a component causes the
equilibrium to shift to the opposite side
2. The removal of a component causes the
equilibrium to the side from which the
component is removed
3. Increasing the temperature drives an
exothermic reaction to the side of the
reactants, an endothermic equilibrium
to the side of the products
4. The addition of a catalyst has NO effect
on the position of the equilibrium
a. T, F, T, F
b. T, T, T, T
c. F, T, F, T
d. F, F, F, F

Answer 23

b

Question 24

Define entropy.
a. Entropy is a function of the state of the
system and determines whether a
physical change or chemical reaction can
occur simultaneously in a closed system
b. Entropy is the opposite of enthalpy
c. Entropy determines the time required
for a reaction to proceed and complete
d. All of these

Answer 24

d

Question 25

Choose the process that occurs with a decrease
in entropy.
a. Freezing of water
b. Boiling of water
c. Dissolving salt in water
d. Sublimation of dry ice

Answer 25

a

Question 26

Which of the following does not have a zero
enthalpy of formation at 298.15K?

Answer 26

Li(g)

Question 27

It is the property of a fluid that is caused by
shearing effect of a fluid layer moving past
another layer.

Answer 27

viscosity

Question 28

The Clapeyron Equation gives the slope

Answer 28

dP/dT

Question 29

The Clausius-Clapeyron Equation does NOT apply
to:
a. S-V equilibrium c. S-L equilibrium
b. L-V equilibrium d. None of these

Answer 29

c

Question 30

What is the Clapeyron Equation?
a. Any of these
b. It postulates that the colligative
properties, freezing point depression,
boiling point elevation, osmotic
pressure, and vapor pressures are all
dependent on the number f particles in
the solution and any change thereof is
described.
c. It postulates that if two components
systems consisting of solid and liquid
phases are miscible in the liquid state
and immiscible in the solid state, only
the pure solid systems will separate out
on cooling solutions.
d. It postulates that if the temperature and
pressure are both change in such a way
asto keep the chemical potentials of two
phases equal to each other, the rates of
change are given by the equation.

Answer 30

d

Question 31

The coexistence curve where the plot of pressure
versus temperature along which the two phases
coexist was shown by Clausius-Clapeyron. What
did Clausius postulate?
a. The Clapeyron equation was simplified
by assuming that the vapor obeys the
ideal gaslaw and by neglecting the molar
volume of the liquid VL in comparison
with the molar volume of the gas V
b. The Clausius-Clapeyron equation does not
apply to this situation
c. The Clausius-Clapeyron theory is
applicable only for vaporization and
sublimation condition
d. Both scientists apply their postulates to
linear and curvilinear representation

Answer 31

a

Question 32

For miscible systems, the boiling point of the
solution is:
a. Lowerthan the boiling point of
the liquid with the lower boiling
point
b. Between the boiling points of
the two liquids
c. Above the boiling point ofthe
liquid with the higher boiling
point
d. Cannot be determined

Answer 32

b

Question 33

All colligative properties stem from the _ of
the chemical potential of the liquid solvent as
a result of the presence of the solute.

Answer 33

Reduction

Question 34

In a process involving osmosis, at equilibrium,
the chemical potential of the pure solvent side
should be _________ the chemical potential of the
side with solute

Answer 34

equal to

Question 35

When a solute is introduced to a liquid system, the
entropy of the said system:

Answer 35

Increases

Question 36

Among the following, which compound will
produce the least lowering of the vapor pressure
of a solution?
a. sucrose, C12H22O11
b. Aluminum chloride, AlCl3
c. Table salt, NaCl
d. Sodium sulfate, Na2SO4

Answer 36

a

Question 37

Which of the following statements is true?
a. Trouton’s rule fails for highly polar
liquids
b. It is impossible to go from vapor phase
to liquid phase without condensation
c. For C compounds and P phases, there
are a total of CP intensive variables to be
specified
d. At high pressures, the latent heat of
vaporization is a measure of the strength
of the intermolecular forces of the liquid

Answer 37

a

Question 38

Are galvanic cells and electrolytic cells the
same? Why?
a. No. because galvanic cells are
electrochemical cells in which
chemical cells occur simultaneously;
while in electrolytic cells, the chemical
reaction is caused by an externally
applied potential difference.
b. No, because galvanic cells need a
constant supply of electricity while
electrolytic cells depend on
intermittent source of power.
c. Yes, because they are both
electrochemical cells and their uses
are common to each other
d. Yes, because galvanic cells and
electrolytic cells are both
electrochemical cells.

Answer 38

a

Question 39

In operating a batch filter, which of the following is the correct method of operation?

A. Keeping the pressure constant, the rate of flow increases.
B. Keeping the flowrate constant and gradually increase the pressure.
C. The particles forming the cake should be large.
D. The slower the flowrate, the more efficient the recovery.

Answer 39

B