Formaldehyde in solution is used as a preservative. It has a melting point of -92°C. When the temperature of a sample of formaldehyde rises from -93°C to -91°C, which of the following occurs?

Question

Quizplus · Accepted Answer

When the temperature of formaldehyde rises from -93°C to -91°C, it means the substance is transitioning from a solid state (below its melting point of -92°C) to a liquid state. In the liquid state, molecules move more freely compared to their movement in the solid state, where they are held in a fixed position within a crystal structure. The other options (B and C) do not typically occur with a simple temperature change in this context, and D describes the opposite process of melting.

Formaldehyde in Solution Is Used as a Preservative