Nigel Baldwin | Heating iodine @nigelbaldwin3184 | Uploaded May 2022 | Updated October 2024, 7 hours ago.
High School Chemistry

Heating iodine

Safety
Heating iodine should always be carried out in a fume cupboard.
It turns into purple iodine gas very easily and this should not be breathed in.
The violet vapour is harmful. It attacks the eyes, skin and lungs.
Iodine is also very toxic to aquatic life.

Experiment
What happens when you heat solid iodine in an evaporating basin using a Bunsen burner?

Does it melt?

Is there any evidence in the video of it turning directly from a solid to a gas? Does it sublime?

Does it have a low melting point or a high melting point?

Research a value for the melting point of iodine

What does the behaviour of iodine on heating tell us about its structure? Is it formed from a giant structure or a small molecule structure?

Key Stage 3 Chemistry resource
For homework or those studying at home