Question

7. What is sublimation? Name two substances
that sublime.​

Answer 1

Some common solids go through sublimation at standard pressure (1 atmosphere). Carbon dioxide sublimates at -78.5 °C (-109.3 °F), and we use this “dry ice” for cooling purposes. Iodine is another substance that has been observed to sublimate at room temperature and pressure. Naphthalene, a chemical with numerous applications, sublimates at approximately 80 °C (176 °F). A substance which normally doesn’t sublimate (i.e. water) at standard pressure can be made to sublimate at lower pressures. The phase relationships of a chemical are expressed on a phase diagram with pressure and temperature as the two axes.

Answer 2

Answer:

Examples are : iodine and carbon dioxide

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