Define sublimation. How is sublimation different from melting? Give few examples of substances that undergo sublimation.
[3 Marks]

Sublimation is a process by which a solid substance directly changes into it's vapour state without undergoing the intermediate liquid state.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [1 Mark]
In melting, a substance converts from solid state to liquid state which is different from sublimation process.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [1 Mark]
Examples of substances that undergo sublimation: camphor, dry ice, ammonium chloride, iodine, etc.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [1 Mark]