Free Energy and Work (Grades 11-12)
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Free Energy and Work
1.
The of a working machine that converts heat into an equivalent amount of work is always less than .
2.
If [math]DeltaS[/math] denotes entropy change, then what is the entropy change for a reversible adiabatic process?
- [math]DeltaS = 0[/math]
- [math]DeltaS = 1[/math]
- [math]Delta S < 1[/math]
- [math]DeltaS >1[/math]
3.
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?
- [math]DeltaS = 0[/math]
- [math]DeltaS > 0[/math]
- [math]DeltaS <0[/math]
- [math]DeltaS = 1[/math]
4.
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?
- [math]H = E// (PV)[/math]
- [math]H = E + PV[/math]
- [math]H = E - PV[/math]
- [math]H = E xx PV[/math]
5.
According to second law of thermodynamics, heat energy cannot be completely converted into useful work owing to
- the entropy of the system.
- the enthalpy of the system.
- the internal energy of the system.
- the translational energy of the system.
6.
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?
[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?
- [math]DeltaG = DeltaH -TDeltaS[/math]
- [math]DeltaG = DeltaH + TDeltaS[/math]
- [math]DeltaG = (DeltaH )/(TDeltaS)[/math]
- [math]DeltaG = DeltaHxx TDeltaS[/math]
7.
Which of the following conditions represents "standard state free energy of reaction" for a spontaneous reaction?
- [math]DeltaG^0 > 0[/math]
- [math]DeltaG^0 < 0[/math]
- [math]DeltaG^0 = 0[/math]
- [math]DeltaG^0 > 1[/math]
8.
The enthalpies of all the elements in their standard states at 298 K are
- one.
- very high.
- zero.
- very low.
9.
Spontaneous processes are thermodynamically reversible.
- True
- False
10.
Electrolysis is an example of a process.
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