Multiple Choice Questions on Entropy

What property is entropy closely related to?

• Heat capacity

• Disorder of the system

• Density

• Atomic mass

Which law of thermodynamics introduces the concept of entropy?

• First law

• Second law

• Third law

• Zeroth law

The entropy of a system will increase during which of the following processes?

• Compression of gas

• Freezing

• Melting

• Formation of a crystal

For an ideal gas, entropy increases when:

• Volume decreases

• Volume increases

• Temperature decreases

• Pressure increases

What is the entropy change in the surroundings if 100J of energy is released at 300K?

• -0.33 J/K

• 0.33 J/K

• -3 J/K

• 3 J/K

If water vaporizes at 100°C, the entropy of the surroundings will:

• Increase

• Decrease

• Remain constant

• Cannot be determined

Which of the following increases when water boils?

• Entropy

• Enthalpy

• Density

• Volume

What is the entropy change when argon gas at 25°C and 1.0 bar expands to double its volume?

• 0.5 J/K

• Positive

• Negative

• Zero

Entropy is a function of:

• State

• Path

• Only temperature

• Pressure and volume

Entropy of vaporization is generally calculated at which temperature?

• Melting point

• Boiling point

• Standard temperature (25°C)

• Room temperature