Question

2. To change a solid to
a solid to agas______must be added.​

Answer 1

Answer:

below

Explanation:

Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.

Answer 2

Answer:

energy

Explanation:

The process of sublimation requires additional energy and is therefore an endothermic change. The enthalpy of sublimation (also called heat of sublimation) can be calculated as the sum of the enthalpy of fusion and the enthalpy of vaporization.