Sublimation
Chemistry ⇒ States of Matter
Sublimation starts at 7 and continues till grade 12.
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See sample questions for grade 8
A mixture of sand and naphthalene is heated. After some time, only sand remains in the dish. What process has occurred?
A student observes that camphor left in an open dish disappears after a few days. What process is responsible for this observation?
Describe a laboratory method to demonstrate sublimation using iodine.
Describe how sublimation is used in the purification of substances.
Describe the difference between evaporation and sublimation.
Explain why dry ice is used to create fog effects in stage performances.
A mixture of sand and naphthalene is heated. After some time, only sand remains in the dish. What process has occurred?
A student observes that camphor left in an open dish disappears after a few days. What process is responsible for this observation?
Sublimation is an example of which type of change?
(1) Physical change
(2) Chemical change
(3) Nuclear change
(4) Biological change
Which of the following best describes the energy change during sublimation?
(1) Energy is released
(2) Energy is absorbed
(3) No energy change
(4) Energy is both released and absorbed
Which of the following is a correct example of deposition?
(1) Water vapor forming frost
(2) Ice melting
(3) Camphor disappearing
(4) Water boiling
Which of the following is an application of sublimation in daily life?
(1) Purification of iodine
(2) Melting of ice
(3) Boiling of water
(4) Rusting of iron
Fill in the blank: Dry ice is the solid form of __________.
Fill in the blank: The process by which a gas changes directly into a solid is called __________.
Fill in the blank: The process of freeze-drying involves removing water from food by __________.
Fill in the blank: The process of sublimation involves a direct change from the __________ state to the __________ state.
True or False: All solids can undergo sublimation under normal conditions.
True or False: Deposition is the process where a gas changes directly into a solid.
True or False: During sublimation, a substance skips the liquid phase.
True or False: Sublimation can be used to separate a mixture of sand and ammonium chloride.
