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Tenth Grade (Grade 10) Thermodynamics Questions

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Grade 10 Thermodynamics
Which phase change involves a solid directly changing into a gas?
  1. Deposition
  2. Sublimation
  3. Condensation
  4. Evaporation
Grade 10 Thermodynamics
According to the kinetic theory, the molecules of the oxygen gas have, at the same temperature,                                                      .
  1. the same average speed as hydrogen molecules
  2. the same average kinetic energy as hydrogen molecules
  3. the same mass as hydrogen molecules
  4. none of the above
Grade 10 Thermodynamics
What is the temperature that is called the absolute zero?
  1. It is the temperature at which liquid water becomes solid ice.
  2. It is the temperature of – 273.16 °C, or 0K.
  3. It is the temperature at which air becomes a liquid.
  4. None of the above
Grade 10 Thermodynamics
What is the magnitude (size) of the kelvin as compared to a °C?
  1. The size of the kelvin is the same size as the Celsius degree: 1K = 1°C.
  2. The size of the kelvin is the same – 273.16 °C.
  3. The size of the kelvin is the same size as Fahrenheit degree.
  4. None of the above
Grade 10 Thermodynamics
How do the boiling points and freezing points in degrees Celsius of certain substances that are gaseous at room temperature change with increasing molar mass?
  1. In general, the higher the molar mass the higher is the FP and BP.
  2. In general, the higher the molar mass the lower is the FP and BP.
  3. In general, the freezing points and boiling points are directly proportional to the molar mass.
  4. None of the above