Sublimation
Chemistry ⇒ States of Matter
Sublimation starts at 7 and continues till grade 12.
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See sample questions for grade 10
A mixture contains ammonium chloride, sodium chloride, and sand. Which component can be separated by sublimation?
A scientist observes that a certain solid, when heated, turns directly into a gas without melting. What is this process called?
A student heats a mixture of iodine and sand. After some time, purple vapors are seen and then solid iodine is collected on a cold surface. What process is being demonstrated?
Describe the difference between evaporation and sublimation.
Describe the energy changes that occur during sublimation.
Explain how sublimation is used to separate a mixture of ammonium chloride and sand.
Explain why camphor disappears when left in an open dish at room temperature.
Explain why dry ice is used to create fog effects in stage performances.
Explain why not all solids can undergo sublimation.
Name two substances, other than dry ice, that can undergo sublimation.
A sealed container contains a small amount of solid iodine and air. The container is kept at a constant temperature. After several days, shiny purple crystals are observed on the cooler walls of the container. Explain the processes involved and name them.
Describe how the phase diagram of carbon dioxide explains why dry ice sublimes at atmospheric pressure rather than melting.
Explain, at the molecular level, why substances like iodine and dry ice can undergo sublimation while sodium chloride cannot under normal atmospheric conditions.
