During the industrial freeze-drying of a pharmaceutical product, water (H2O\text{H}_2\text{O}H2O) is first frozen into ice. The ambient pressure is then reduced, allowing the ice to transition directly into water vapour to be removed. Finally, this water vapour is collected on a condenser at a very low temperature, where it converts directly back into solid ice.
What are the names of these two phase transitions respectively?
Sublimation and deposition\text{Sublimation and deposition}Sublimation and deposition
Evaporation and condensation\text{Evaporation and condensation}Evaporation and condensation
Sublimation and condensation\text{Sublimation and condensation}Sublimation and condensation
Evaporation and deposition\text{Evaporation and deposition}Evaporation and deposition
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.