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Free Energy and Work (Grades 11-12)

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Free Energy and Work

The                            of a working machine that converts heat into an equivalent amount of work is always less than                 .
If [math]DeltaS[/math] denotes entropy change, then what is the entropy change for a reversible adiabatic process?
  1. [math]DeltaS = 0[/math]
  2. [math]DeltaS = 1[/math]
  3. [math]Delta S < 1[/math]
  4. [math]DeltaS >1[/math]
Which of the following expressions for the change in entropy of an isothermal, irreversible process is correct, if [math]DeltaS[/math] denotes the entropy change?
  1. [math]DeltaS = 0[/math]
  2. [math]DeltaS > 0[/math]
  3. [math]DeltaS <0[/math]
  4. [math]DeltaS = 1[/math]
If H = Enthalpy = Total heat content of a system, E = Internal energy, and PV = pressure-volume type of work, which of the following equations correctly describes the relation of these parameters?
  1. [math]H = E// (PV)[/math]
  2. [math]H = E + PV[/math]
  3. [math]H = E - PV[/math]
  4. [math]H = E xx PV[/math]
According to second law of thermodynamics, heat energy cannot be completely converted into useful work owing to
  1. the entropy of the system.
  2. the enthalpy of the system.
  3. the internal energy of the system.
  4. the translational energy of the system.
Given that [math]DeltaG[/math] = Gibb's free energy change
[math]Delta H [/math] = Change in enthalpy of the system
[math]Delta S[/math] = Change in entropy of the system

Which of the following expressions correctly describes Gibb's free energy change for a chemical reaction that is carried out at constant temperature?
  1. [math]DeltaG = DeltaH -TDeltaS[/math]
  2. [math]DeltaG = DeltaH + TDeltaS[/math]
  3. [math]DeltaG = (DeltaH )/(TDeltaS)[/math]
  4. [math]DeltaG = DeltaHxx TDeltaS[/math]
Which of the following conditions represents "standard state free energy of reaction" for a spontaneous reaction?
  1. [math]DeltaG^0 > 0[/math]
  2. [math]DeltaG^0 < 0[/math]
  3. [math]DeltaG^0 = 0[/math]
  4. [math]DeltaG^0 > 1[/math]
The enthalpies of all the elements in their standard states at 298 K are
  1. one.
  2. very high.
  3. zero.
  4. very low.
Spontaneous processes are thermodynamically reversible.
  1. True
  2. False
Electrolysis is an example of a                                    process.

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