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Twelfth Grade (Grade 12) Matter Questions

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Grade 12 Quantum Physics and the Atom
Compton Scattering involves what kind of energy?
  1. low energy x-rays
  2. doesn't use any energy
  3. moderate energy x-rays
  4. very high energy x-rays
Grade 12 Matter
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
  1. The ash has the same mass as the log, although a large percentage of it blows away.
  2. The law of conservation of mass applies to changes of state but not to chemical reactions.
  3. The law of conservation of mass applies to substitution and displacement reactions, but not to combustion reactions.
  4. The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
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 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
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 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
Grade 12 Thermodynamics
Grade 12 Thermodynamics
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 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 Matter
The basic building blocks of elements are called
  1. eons
  2. silica tetrahedra
  3. minerals
  4. atoms
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