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Twelfth Grade (Grade 12) Matter Questions

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Grade 12 Thermodynamics
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
Grade 12 Matter
Which type of energy is released when an ionic solid is dissolved in water?
  1. Hydration energy
  2. Solvation energy
  3. Lattice energy
  4. Crystal energy
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
  1. [math]DeltaU=Q+W[/math]
  2. [math]DeltaU=W-Q[/math]
  3. [math]DeltaU=Q-W[/math]
  4. [math]DeltaU=Q+2W[/math]
Grade 12 Thermodynamics
Which of the following is an example of spontaneous processes?
  1. Electrolysis
  2. Combustion
  3. Photosynthesis
  4. The rusting of iron
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Grade 12 Thermodynamics
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]
Grade 12 Matter
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. [math]h = 6.625 xx 10^-34 J[/math][math][/math]
  2. [math]h = 6.520 xx 10^-30 C[/math]
  3. [math]h = 6.645 xx 10^-25 J[/math]
  4. [math]h = 6.21 xx 10^-20 C[/math]
Grade 12 Thermodynamics
Which of the following expressions correctly characterizes an isolated system?
  1. [math]∆U<0[/math]
  2. [math]∆U=0[/math]
  3. [math]∆U>0[/math]
  4. None of the above
Grade 12 Thermodynamics
Grade 12 Thermodynamics
Grade 12 Thermodynamics
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
Grade 12 Thermodynamics
In which of the following systems does the temperature of the process remain constant throughout the system?
  1. Isotherm process
  2. Adiabatic process
  3. Reversible process
  4. Irreversible process
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