Physical Chemistry Flashcards
An ideal gas will only be considered in the following operating parameters
Low Pressure, High Temp
Which of the following is false regarding absolute zero?
A. All molecules will stop moving
B. Absolute zero can be achieved
C. Temperature is 0 K
D. Temperature is 0 R
B.
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. Intermolecular forces of attraction of the molecules with one another
D. Molecules randomly hit the sides of the wall with less force than usual
C.
When gas molecules collide, they experience
_____ collision
Perfectly elastic
Which of the ff is false with KMT?
a.Gas molecules move in random motion
b.Due to the 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 is negligible
B.
This is the pressure exerted by the gas molecules that are in equilibrium with the liquid.
Vapor Pressure
The internal energy of an ideal gas depends on?
Absolute temperature
Which of the ff is not conserved in any process?
A. Mass
B. Energy
C. Momentum
D. Entropy
D.
An isentropic process is?
Reversible and adiabatic
Increasing the temperature of the cold reservoir ____ the Carnot efficiency.
A. Increases
B. Decreases
C. Does not change
D. NOTA
B. Decrease
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
A.
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:
a.ΔU
b.VΔP
c.ΔH
d.CP
A.
Heat required to raise the temperature of 1lbm of water by 1˚F
BTU
The Third Law of Thermodynamics is attributed to?
Walther Nernst
The equilibrium-intensive state of a system is described by specifying the temperature, pressure, and?
Mole fractions
The fugacity of a real gas is equal to
The pressure of an ideal gas which has the same chemical potential as the real gas
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
C.
It states that when a stress is placed on a system in equilibrium, the system tends to change in a way that relieves the stress.
Le Chatelier’s Principle
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
B.
It 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.
Entropy
Is is the opposite of enthalpy
Entropy
It determines the time required for a reaction to proceed and complete
Entropy
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
A. (from liquid to solid)
Which of the following does not have a zero enthalpy of formation at 298.15K?
a.Li(g) c. Hg(l)
b.He(g) d.Br2(l)
A. (as its natural state should be solid)
