Interconversions between the three states of matter
2 marks · EasyCarbon dioxide can change directly from a solid to a gas and back again. Explain the names given to each of these two processes.
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The process from solid to gas is called sublimation. The process from gas to solid is called deposition.
Also accept: The process from gas to solid can also be called desublimation
Common mistakes: Calling the process condensation; Using melting or freezing
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Marking points
B1 · 1 mark · States that changing from solid to gas is sublimation.
B2 · 1 mark · States that changing from gas to solid is deposition (or desublimation).
Worked solution
The process from solid to gas is called sublimation. The process from gas to solid is called deposition (or desublimation).