name two substances which show sublimation
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Answer:
Substances that show sublimation are iodine, dry ice, menthol, and camphor
Explanation:
- Sublimation is the process of changing or transitioning from a solid to a gaseous state without entering the liquid state.
- De-sublimation or deposition is the inverse of this process, in which the gas transitions straight to the solid phase.
- Sublime is the solid material that turns to gas, whereas sublimate is the solid formed by cooling the vapors.
- Sublimation is an endothermic reaction, meaning it absorbs energy, whereas deposition is an exothermic reaction, meaning it releases energy.
- Sublimation happens when certain molecules absorb heat energy, gaining significantly more energy than their neighbors and so overcoming the laws of attraction and escaping into the vapor phase.
- The heat or energy necessary to shift the state of a substance from solid to gas is known as the enthalpy of sublimation, and it is different for each substance. It is commonly stated as KJ/mol or even KJ/kg.
- Sublimation is observed in substances such as iodine, dry ice, menthol, and camphor.
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