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1. State whether each of the following are true or false. A thermodynamic property is always...

1. State whether each of the following are true or false.

A thermodynamic property is always conserved.

Internal energy change is not dependent on choice of system.

Enthalpy change is path dependent.

Volume change is not path dependent.

Sum of heat and work is path dependent.

Reversible work is path dependent.

Temperature is constant for an ideal gas if internal energy is constant.

Temperature is constant for an ideal gas if entropy is constant.

It is possible to convert work solely to heat in a cyclic process.

There is no enthalpy change in a reversible adiabatic process.

A process with no entropy change is always reversible.

A reversible process produces the most work.

Entropy is destroyed in a system when there is lost work.

Entropy of a system can never decrease.

Entropy of the entire universe can never decrease.

Solutions

Expert Solution

A thermodynamic property is always conserved = false, because sum of total energy is constant not individual properties.

Internal energy change is not dependent on choice of system = true, because internal energy is a state function & not a path function.

Enthalpy change is path dependent = true.

Volume change is not path dependent =false.

Sum of heat and work is path dependent = false, Sum of heat and work is equal to internal energy which is a state function.

Reversible work is path dependent = true.

Temperature is constant for an ideal gas if internal energy is constant = true.

Temperature is constant for an ideal gas if entropy is constant = false, for an reversible adiabatic process entropy is constant but temp may change.

It is possible to convert work solely to heat in a cyclic process = false, even carnot engine which has max efficiency can't do this.

There is no enthalpy change in a reversible adiabatic process = false, if there is a pressure change then enthalpy change ll occur.

A process with no entropy change is always reversible = true.

A reversible process produces the most work = true

Entropy is destroyed in a system when there is lost work = true

Entropy of a system can never decrease = false, lowering of degree of randomness decreases entropy.

Entropy of the entire universe can never decrease = true.

Amanda K answered 1 year ago

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