Sublimation
Chemistry ⇒ States of Matter
Sublimation starts at 7 and continues till grade 12.
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See sample questions for grade 11
A mixture contains naphthalene and sodium chloride. Suggest a method to separate them and explain your reasoning.
A student observes that naphthalene balls in a closed container decrease in size over time. What process is responsible for this observation?
Describe a laboratory method to separate a mixture of sand and ammonium chloride using sublimation.
Describe the difference between evaporation and sublimation.
Explain why camphor disappears when left in an open dish at room temperature.
A mixture contains naphthalene and sodium chloride. Suggest a method to separate them and explain your reasoning.
A student observes that naphthalene balls in a closed container decrease in size over time. What process is responsible for this observation?
A sample of solid carbon dioxide (dry ice) is placed in a sealed, rigid container at 25 °C. Describe and explain the changes in pressure inside the container over time, considering the process of sublimation.
In the context of phase diagrams, at what point does sublimation occur? (1) Triple point (2) Below the triple point (3) Above the critical point (4) At the melting point
Which of the following best describes sublimation? (1) A solid changing directly to a gas (2) A liquid changing to a gas (3) A gas changing to a solid (4) A solid changing to a liquid
Which of the following best describes the energy changes during sublimation? (1) Energy is released (2) Energy is absorbed (3) No energy change (4) Energy is first released, then absorbed
Which of the following best explains why dry ice is used to create fog effects in theaters? (1) It melts to form water vapor (2) It sublimes to form carbon dioxide gas (3) It evaporates quickly (4) It condenses to form liquid carbon dioxide
Fill in the blank: The enthalpy change associated with sublimation is called the _______ of sublimation.
Fill in the blank: The process of _______ is the direct conversion of a gas to a solid, which is the reverse of sublimation.
Fill in the blank: The process of _______ is used to separate iodine from a mixture of sand and iodine.
Sublimation occurs when a substance changes from the _______ phase directly to the _______ phase without passing through the _______ phase.
True or False: Sublimation can be used as a method of purification for volatile solids.
True or False: Sublimation can occur at any temperature and pressure.
True or False: Sublimation can only occur in vacuum.
True or False: Sublimation is an endothermic process.
