Enthalpy and Internal Energy Relationship Quiz

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Which equation correctly represents the relationship between internal energy and enthalpy for an ideal gas?

U = H - PV

U = H + PV

H = U + PV (correct)

H = U - PV

What is the specific heat ratio (k) for an ideal gas in terms of specific heats at constant volume and pressure?

k = U / H

k = H / U

k = Cp / Cv (correct)

k = Cv / Cp

In a thermodynamic system, what does enthalpy (H) represent?

Temperature change

Total heat content of the system (correct)

Internal energy only

Pressure and volume product

What is the formula for calculating enthalpy (H) using internal energy (U), pressure (P), and volume (V)?

H = U + PV Signup and view all the answers

How is the internal energy (U) of an ideal gas related to the temperature (T)?

U is a function of temperature Signup and view all the answers

If the volume of an ideal gas decreases at constant pressure, what happens to its enthalpy?

Enthalpy decreases Signup and view all the answers

In the context of the First Law of Thermodynamics, if a system gains heat and has work done on itself, how would the internal energy change be represented?

Positive Signup and view all the answers

For a system with constant volume (ΔV=0) and no work done on it, what is the relationship between heat (q) and internal energy change (ΔU)?

ΔU = q Signup and view all the answers

If a system undergoes an exothermic process, how would the heat transfer (q) be represented?

Negative Signup and view all the answers

In a thermodynamic process where work is done but no heat transfer occurs, what is the relationship between internal energy change (ΔU) and work done (w)?

ΔU = -w Signup and view all the answers

If a system has a non-zero change in volume (ΔV≠0), which term usually contributes to the work done (w) in the First Law of Thermodynamics equation?

-PΔV Signup and view all the answers

When calculating the internal energy change of a system, why does an increase in heat in the surroundings lead to a decrease in heat for the system?

Heat is neither created nor destroyed in a closed system Signup and view all the answers

What does the first law of thermodynamics state?

Energy is conserved and can be converted between different forms Signup and view all the answers

Which of the following best describes internal energy in a system?

Internal energy encompasses all the energy within a system Signup and view all the answers

In the context of thermodynamics, what is the relationship between work and heat?

Work and heat together allow systems to exchange energy Signup and view all the answers

What is the significance of the pV diagram in thermodynamics?

It shows the change in volume with respect to pressure for a system Signup and view all the answers

Why is internal energy an important factor in understanding work and heat transfers?

Internal energy affects how much work can be done by a system Signup and view all the answers

If a system does 200 J of work onto its surroundings and loses 100 J of heat, what is the change in internal energy of the system?

-300 J Signup and view all the answers