8.3 Thermodynamics

Which of the following best describes the first law of thermodynamics?

• Energy can be created or destroyed.

• The internal energy of a system equals the heat added minus the work done by the system.

• Heat and work are independent of each other.

• The internal energy of a system remains constant.

If heat is absorbed, the Q value is _____________.

• positive

• negative

Which of the following represents the work done by a system in the first law of thermodynamics?

• W = PΔV

• W = Q − ΔU

• W = ΔU + Q

• W = ΔV/P

In which type of process does the temperature remain constant throughout the expansion or compression?

• Isothermal

• Isobaric

• Isovolumetric

• Adiabatic

What is the internal energy change (ΔU) in an isothermal process?

• Positive

• Zero

• Negative

• Depends on work done

In adiabatic process, the heat transfer (Q) is:

• Zero

• Positive

• Negative

• Equal to the work done

Which of the following processes occurs at constant volume?

• Isothermal

• Isobaric

• Isovolumetric

• Adiabatic

In an isobaric process, what remain constant?

• volume

• pressure

• temperature

• heat

During adiabatic process, what happens to the internal energy of the gas?

• equals to Q

• equals to zero

• equals to negative W

• equals to positive W

Define adiabatic process.

A process that occurs _______________________________ into or out of a system.

• constant pressure

• constant volume

• constant pressure

• without heat transfer