Final answer:
Iodine and dry ice (solid CO₂) are examples that undergo sublimation when heated. Iodine sublimes to produce a purple vapor, while dry ice sublimes at room temperature, appearing to disappear as it turns into gas.
Step-by-step explanation:
One element that demonstrates sublimation once heated is iodine. When solid iodine is gently warmed, it transitions directly from a solid to a vapor, bypassing the liquid phase entirely. This phase change is easily observable as the iodine produces a distinct purple vapor. Another example of sublimation is dry ice, which is solid carbon dioxide (CO₂). At room temperature and standard pressure, dry ice sublimes and seems to vanish, as it turns directly into gas without forming any liquid.
Sublimation is a fascinating process, and it can be observed under different conditions. Snow and ice can sublime under specific temperatures and conditions, particularly at high elevations where the air pressure is lower. The reverse process of sublimation, where gas turns back into a solid, is known as deposition, with frost formation being a common example.