Name the part labelled I, II, III and IV. What method of separation was used by the student? Mention two substances that can sublime. Mention one mixture that can be separated by the method used by the student.

Here are the answers to your questions based on the provided diagram:

1. Name the part labelled I, II, III and IV:

   • I: Cotton wool plug (or Stem of the funnel)
   • II: Sublimate (the purified solid that has condensed)
   • III: Mixture (the original solid mixture being heated)
   • IV: Heat source (e.g., Bunsen burner)

2. What method of separation was used by the student? The method of separation used is sublimation.

3. Mention two substances that can sublime: Two substances that can sublime are:

   • Iodine
   • Naphthalene (mothballs)

4. Mention one mixture that can be separated by the method used by the student: One mixture that can be separated by sublimation is ammonium chloride and sand.