* Ammonium chloride can sublime, meaning it transitions directly from a solid to a gas phase when heated. This is because the weak intermolecular forces holding the ammonium chloride molecules together are easily overcome by heat.
* Sodium chloride does not sublime. It has strong ionic bonds holding the sodium and chloride ions together, requiring much higher temperatures to break these bonds and transition to a gaseous state. Instead, it will melt and then boil at much higher temperatures.
