Sublimation
Chemistry ⇒ States of Matter
Sublimation starts at 7 and continues till grade 12.
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Describe a simple experiment to demonstrate sublimation using naphthalene balls.
Describe the difference between evaporation and sublimation.
Describe what happens to the particles of a solid during sublimation.
Describe what happens to the temperature of a substance during sublimation if it is heated at a constant rate.
Explain how sublimation is used to purify iodine.
Explain why camphor is used in air fresheners.
Explain why not all solids can undergo sublimation.
Explain why sublimation is considered a physical change.
Which of the following best describes the energy change during sublimation?
(1) Energy is absorbed
(2) Energy is released
(3) No energy change
(4) Energy is both absorbed and released
Which of the following best explains why naphthalene balls become smaller over time when left in the open?
(1) They melt
(2) They evaporate
(3) They sublimate
(4) They dissolve
Which of the following is a correct example of deposition?
(1) Water boiling
(2) Frost forming on a cold surface
(3) Ice melting
(4) Camphor disappearing
Which of the following is a correct statement about sublimation?
(1) It only occurs at very high temperatures
(2) It is a chemical change
(3) It involves a direct change from solid to gas
(4) It requires the substance to be dissolved in water
Fill in the blank: Dry ice is the solid form of __________.
Fill in the blank: Sublimation is an example of a __________ change.
Fill in the blank: Sublimation is the direct change of a __________ into a gas.
Fill in the blank: The process in which a gas changes directly into a solid is called __________.
True or False: All solids can undergo sublimation under normal conditions.
True or False: Dry ice is solid carbon dioxide and it sublimes at room temperature.
True or False: During sublimation, a substance skips the liquid state.
True or False: Sublimation can be observed in the disappearance of snow in cold, dry weather without melting.
