Question

As opposed to most solids, when glass is heated, it?

1) melts rapidly to a liquid over a narrow temperature range.
2) goes directly into the gas phase; a process known as sublimation.
3) separates into its individual components.
4) gradually softens over a wide temperature range.

Answer 1

Unlike most solids, when glass is heated, it gradually softens over a wide temperature range. This distinctive behavior sets glass apart from materials that melt rapidly over a specific temperature range. So, the correct answer is 4) gradually softens over a wide temperature range.

Step-by-step explanation:

Glass Softening Process: When glass is heated, it undergoes a unique transformation characterized by gradual softening over a wide temperature range. This behavior is distinct from materials that exhibit a well-defined melting point.

Amorphous Nature of Glass: Glass is an amorphous solid, lacking a distinct crystalline structure. As a result, its response to heat is not a sharp melting but a gradual softening, occurring over a broader range of temperatures.

Viscosity Transition: The heating process for glass involves a transition in viscosity rather than a traditional melting point. This gradual softening is a consequence of the gradual decrease in viscosity, allowing the glass to flow or deform under the influence of heat.

Therefore, the correct answer is 4) gradually softens over a wide temperature range.