Thermodynamics Quiz

Which of the following is a state function?

• Work

• Heat

• Internal energy

• Path length

The SI unit of enthalpy is:

• Joules (J)

• Calories

• Kelvin (K)

• Pascal

The first law of thermodynamics states that:

• Energy cannot be destroyed but can be created.

• Energy can be created or destroyed.

• Energy can neither be created nor destroyed.

• Heat and work are unrelated.

The mathematical form of the first law of thermodynamics is:

• ΔU = q - W

• ΔU = q + W

• ΔU = q × W

• ΔU = q / W

Which of the following processes is exothermic?

• Melting of ice

• Combustion of methane

• Vaporization of water

• Dissociation of NaCl in water

Which quantity remains constant in an isothermal process?

• Pressure

• Volume

• Temperature

• Entropy

In an adiabatic process, which of the following does not occur?

• Heat exchange

• Change in temperature

• Work done

• Change in volume

What is the value of ΔH for an isothermal and reversible expansion of an ideal gas?

• Zero

• Positive

• Negative

• Depends on the system

The enthalpy change for a reaction depends on:

• The path followed

• Initial and final states

• Heat exchanged

• Temperature and pressure only

Which of the following is the correct relationship between enthalpy (ΔH) and internal energy (ΔU)?

• ΔH = ΔU + ΔnRT

• ΔH = ΔU - ΔnRT

• ΔH = ΔU + ΔpV

• ΔH = ΔU × ΔnRT