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Q1-5 True or False A closed system cannot interact with its surroundings. Density is an intensive property. A homogene

Q1-5 True or False A closed system cannot interact with its surroundings. Density is an intensive property. A homogeneous system must be a pure substance. Avogadro’s number has no units. Mole fractions are intensive properties. Q6-10 True or False

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Q1-5 True or False A closed system cannot interact with its surroundings. Density is an intensive property. A homogene

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  1. Q1-5 True or False • A closed system cannot interact with its surroundings. • Density is an intensive property. • A homogeneous system must be a pure substance. • Avogadro’s number has no units. • Mole fractions are intensive properties.

  2. Q6-10 True or False • The p-V work in a reversible process in a closed system is always pV. • The p-V work for a reversible process of a closed system can be found from only the initial and final states. • The p-V work for a reversible process of a closed system can be found from only the initial and final states if one also knows the equation of state, p(V,T). • For every process Usystem = - Usurroundings. • For every cyclic process, the final state of the surroundings is the same as the initial state.

  3. Q11-15 True or False • For two systems that consist entirely of liquid water at 1 atm. If system A has more internal energy than system B, then TA > TB. • The quantities H, U, PV, H, and pV all have the same units. • For a constant volume process U = H. • H is only defined for a constant pressure process. • For an ideal gas at constant pressure dU = CVdT.

  4. Q16-20 True or False • Cp is a state function. • Cp is an extensive property. • A Thermodynamic process is defined by the initial and final states. • Every process that has T=0 is isothermal. • q must be zero for an isothermal process.

  5. Q21-27 For each process, indicate whether U, H, q, and w is positive negative or zero. • Reversible melting of benzene at 1atm and its normal melting point. • Reversible melting of water at 1atm and 0oC. • Reversible adiabatic expansion of an Ideal Gas. • Reversible Isothermal expansion of an Ideal Gas. • Joule-Thompson (adiabatic throttling) of an Ideal Gas. • Reversible isobaric heating of an Ideal Gas. • Reversible Isochoric cooling of an Ideal Gas.

  6. Q28-33 True or False • H is a state function. • CV is independent of temperature for an Ideal Gas. • U=q+w for an open system. • For a closed system in the absence of external fields U=q+w. • For a closed system in the absence of external fields undergoing an adiabatic process with w=0, the temperature must be constant. • For a closed system with only p-V work, a constant pressure process that has q<0 must have T>0.

  7. Q34-38 True or False • For a Carnot engine, just increasing the temperature of the ‘hot’ reservoir must increase the engine efficiency. • For a Carnot engine, just decreasing the temperature of the ‘cold’ reservoir must increase the engine efficiency. • The Carnot engine is a reversible cycle. • Since the Carnot engine is a cycle, the work done in the cycle must be zero. • For the same change in state, the Entropy of the system increases more for an irreversible process than for a reversible one.

  8. Q39-43 True or False • The entropy of 20g of water at 1atm and 300K is twice that of 10g of water at 1atm and 300K. • For a reversible isothermal process in a closed system, S must be zero. • The change in entropy of a closed system undergoing an adiabatic process must be zero. • Thermodynamics cannot calculate S for an irreversible process. • For a reversible process in a closed system q=TS.

  9. Q44-48 True or False • The relation G=H-TS is always valid. • G=A+pV • The quantities G, A, SdT, TdS, Vdp, and U all have the same units. • In classical Thermodynamics G is undefined for a process where the temperature changes. • G=0 for a reversible phase transition at constant temperature and pressure.

  10. Q49-54 True or False • Cp-CV = nR. • G=0 for any reversible process in a closed system capable of only p-V work. • The Gibbs energy of a closed system with p-V work only is always minimized at equilibrium. • The work done by a closed system can exceed the decrease in the systems internal energy. • For an irreversible isothermal isobaric process in a closed system with p-V work only, G<0. • Gsystem + Gsurroundings = constant for any process.

  11. Q55-60 True or False • Ssystem>0 for any irreversible process. • Ssystem + Ssurroundings = 0 for any reversible process. • (TS)=ST + TS. • (U-TS) = U - (TS). • If a>b, then ka > kb where k is a non-zero constant. • (V/T)p = V/T at constant pressure.

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