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You can create printable tests and worksheets from these Grade 12 Thermodynamics questions! Select one or more questions using the checkboxes above each question. Then click the add selected questions to a test button before moving to another page.

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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
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
1. $DeltaU=Q+W$
2. $DeltaU=W-Q$
3. $DeltaU=Q-W$
4. $DeltaU=Q+2W$
Which of the following is an example of spontaneous processes?
1. Electrolysis
2. Combustion
3. Photosynthesis
4. The rusting of iron
If $DeltaS$ denotes entropy change, then what is the entropy change for a reversible adiabatic process?
1. $DeltaS = 0$
2. $DeltaS = 1$
3. $Delta S < 1$
4. $DeltaS >1$
Which of the following expressions provides the correct conversion for Joules and Calories?
1. 1 Joule (J) = 0.239 Cal
2. 1 Joule (J) = 0.547 Cal
3. 1 Joule (J) = 0.345 Cal
4. 1 Joule (J) = 0.451 Cal
Which of the following expressions correctly characterizes an isolated system?
1. $∆U<0$
2. $∆U=0$
3. $∆U>0$
4. None of the above
In which of the following cases would $∆U$ in $∆U=Q+W$ be less than zero?