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You can create printable tests and worksheets from these Grade 12 Matter 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. $DeltaU=Q+2W$
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 is an example of spontaneous processes?
1. Electrolysis
2. Combustion
3. Photosynthesis
4. The rusting of iron
The basic building blocks of elements are called
1. eons.
2. silica tetrahedra.
3. minerals.
4. atoms.
Grade 12 Quantum Physics and the Atom
What is the correct value of Planck's constant (h), according to Planck's quantum theory?
1. $h = 6.625 xx 10^-34 J$
2. $h = 6.520 xx 10^-30 C$
3. $h = 6.645 xx 10^-25 J$
4. $h = 6.21 xx 10^-20 C$
Which of the following expressions provides the correct conversion between 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
In which of the following cases would $∆U$ in $∆U=Q+W$ be less than zero?
1. Work is done on the system.
2. Work is done by the system.
3. The magnitudes of heat and work are equivalent.
4. The magnitude of heat is greater than that of the work.
1. $∆U<0$
2. $∆U=0$
3. $∆U>0$