Chapter 12, Problem 113A

Solution

Interpretation:

The reason for the solidification of iodine when the tube is tilted needs to be explained.

Concept introduction:

Iodine solution becomes solid when it is cool down.

The bottom part of tube is heated and when it is tilted it flowed to the cool part.

Iodine melts on heating. The bottom of the tube is hotter than upper region of tube.

When the tube is tilted the melted iodine starts flowing toward colder end. Therefore, it is gets solidified.

Flowing of melted iodine from hotter region to colder end of tube makes it solidified.