Understanding Work in Thermodynamics

How is work defined when the surroundings do work on the system?

• As a negative number

• As a positive number

• As an undefined value

• As zero

What happens to the energy of a gas when it expands?

• The gas gains energy

• The gas loses energy

• The energy remains constant

• The energy is undefined

In a compression process, what is the sign of work done on the system?

• Negative

• Zero

• Positive

• Undefined

What is the ultimate definition of work in terms of pressure and volume?

• P external plus DV

• P external divided by DV

• Negative P external times DV

• Positive P external times DV

What is the advantage of performing work calculations at constant pressure?

• It is not advantageous

• It requires more variables

• It simplifies the integral

• It makes the math more complex

What does a reversible process aim to achieve?

• Maximum energy loss

• Constant temperature

• Rapid changes in the system

• Equilibrium throughout the process

In a reversible isothermal expansion, what must be true about the external pressure?

• It must be less than the gas pressure

• It must be zero

• It must equal the gas pressure

• It must be greater than the gas pressure

What is the integral of 1/V DV in the context of work calculations?

• A linear function

• A natural logarithm

• An exponential function

• A constant value

Which law is used to express the pressure of a perfect gas in reversible isothermal expansions?

• Boyle's Law

• Charles's Law

• Avogadro's Law

• Ideal Gas Law

What is the expression for work in a reversible isothermal expansion?

• NRT times the natural log of V final over V initial

• NRT times V final over V initial

• Negative NRT times the natural log of V final over V initial

• Negative NRT times V final over V initial