Thermodynamics Quiz

A system that doesn’t exchange matter or energy with its surroundings is __________.

• adiabatic

• isolated

• isothermal

• isobaric

• isochoric

A system suffers an increase in internal energy of 80 J and at the same time has 50 J of work done on it. What is the heat change of the system?

• +130 J

• +30 J

• -130 J

• -30 J

• 0 J

Calculate Ho for the reaction: Na2O(s) + SO3(g) Na2SO4(g) given the following information: Ho (1) Na(s) + H2O(l) NaOH(s) + 1/2 H2(g) -146 kJ (2) Na2SO4(s) + H2O(l) 2NaOH(s) + SO3(g) +418 kJ (3) 2Na2O(s) + 2H2(g) 4Na(s) + 2H2O(l) +259 kJ

• +255 kJ

• -435 kJ

• -581 kJ

• +531 kJ

• -452 kJ

An ideal gas differs from a real gas in that the molecules of an ideal gas

• have no attraction for one another.

• have a significant volume.

• have a molar mass of zero.

• have no kinetic energy

A sample of oxygen occupies 47.2 liters under a pressure of 1240 torr at 25oC. What volume would it occupy at 25oC if the pressure were decreased to 730 torr?

• 27.8 L

• 29.3 L

• 32.3 L

• 47.8 L

• 80.2 L

A real gas most closely approaches the behavior of an ideal gas under conditions of:

• high P and low T

• low P and high T

• low P and T

• high P and T

• STP

At a constant temperature, an ideal gas is compressed from 6.0 liters to 4.0 liters by a constant external pressure of 5.0 atm. How much work is done on the gas?

• W = +10 liter atm

• W = -10 liter atm

• W = +30 liter atm

• W = -30 liter atm

• The answer cannot be calculated

Of the following only ______ is not a state function

• S

• H

• Q

• U

• None of these

Chemical potential has no role in

• Phase transition

• Chemical reaction

• Biological process

• D. All

• E. none

The entropy changes for an isothermal and reversible expansion of a mole of an ideal gas from 100 cm3 to 1000 cm3 is

• 10 J K-1

• 19.14 J K-1

• C. 83.14 J K-1

• 5.76 J K-1

• E. none