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Day 2 > PHYCHEM > Flashcards

PHYCHEM Flashcards

1
Q

An ideal gas will only be considered in the The state of an ideal gas is changed in a closed
following operating parameters:

A

High Temperature, Low Pressure

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2
Q

Which of the following is false regarding absolute
zero?
a. All molecules will stop moving
b. Absolute zero can be achieved
c. Temperature is OK
d. Temperature is OR

A

b. Absolute zero can be achieved

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3
Q

For a real gas, what causes the deviation from
the ideal pressure at a molecular level? V
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. Intermolecular forces of attraction of the molecules with one another
d. Molecules randomly hit the sides of the Conceptual Question
wall with less force than usual

A

c. Intermolecular forces of attraction of the molecules with one another

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4
Q

When gas molecules collide, they experience collision.
a. Perfectly elastic c. Perfectly inelastic
b. Imperfect elastic d. Imperfect inelastic

A

a. Perfectly elastic

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5
Q

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

A

b. Due to collision of gas molecules with each other, some kinetic energy is lost

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6
Q

This is the pressure exerted by the gas molecules that are in equilibrium with the liquid.
a. Partial pressure c. Total pressure
b. Atmospheric pressure d. Vapor pressure

A

d. Vapor pressure

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7
Q

The internal energy of an ideal gas depends on: Reversible and adiabatic
a. Volume c. Pressure
b. Absolute temperature d. Number of moles

A

b. Absolute temperature

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8
Q

It is a characteristic of an adiabatic process?

A

Internal energy is 0

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9
Q

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

A

c. Reversible and adiabatic

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10
Q

Increasing the temperature of the cold reservoir __________ the Carnot efficiency.

A

decreases

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11
Q

If the entropy of a system decreases, the entropy
of its surroundings

A

must always increase

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12
Q

The amount of heat absorbed when CO, gas
reacts with a solid CaO to form solid CaCO, is measured in a bomb calorimeter. The data obtained five a direct measure of

A

Internal energy

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13
Q

Heat required to raise the temperature of 1lbm of water by 1 degree Fahrenheit

A

BTU

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14
Q

The general statement of the Third Law of Thermodynamics is attributed to:

A

Walter Nernst

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15
Q

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

A

mole fractions

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16
Q

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.
a. 1 only
b. Both 1 and 2
c. 2 only
d. NOTA

A

Both 1 and 2

17
Q

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.

18
Q

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 internal energy of the system

A

c. Equal to the increase in internal energy of the system

19
Q

State Le Chatelier’s principle

A

When a stress is placed on a system in equilibrium, the system tends to change in a way that relieves stress.

20
Q

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.

A

d. ALL OF THESE.

21
Q

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

A

a. Freezing of water

22
Q

Which of the following does not have a zero enthalpy of formation at 298.15K?
a. Li(g)
b. He(g)
c. Hg(l)
d. Br2(l)

A

a. Li(g)

23
Q

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

A

Viscosity

24
Q

The Clapeyron Equation gives the slope

A

dP/dT

25
Q

The Clausius-Clapeyron Equation does not apply to:
a. S-V equilibrium
b. L-V equilibrium
c. S-L Equilibrium
d. NOTA

A

S-L equilibrium

26
Q

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 vapos obeys the ideal gas law and by neglecting the molar volume of the gas in comparison with the molar volume of the gas Vg.

27
Q

For miscible systems, the boiling point of the solution is

A

between the boiling points of the two liquids

28
Q

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.

A

equal to

29
Q

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

A

increases

30
Q

Among the following, which compound will produce the least lowering of the vapor pressure of a solution?
a. C12H22,O11
b. AlCl3
c. NaCl
d. Na2SO4

A

sucrose, C12H22O11

31
Q

Trouton’s rule fails for highly polar liquids

A

true

32
Q

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 both electrochemical cells and their uses are common to each other
d. Yes, because galvanic cells and electrolytic cells are both electrochemical cells.

A

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.

33
Q

entropy of a system approaches a constant value when it’s T approaches absolute zero

A

Third Law of Thermodynamics
-Walter Nersnt

Day 2 (9 decks)

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