Formaldehyde in Solution Is Used as a Preservative

Multiple Choice

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?

A) The molecules move more freely.
B) The molecules lose electrical charge.
C) The molecules break apart into atoms.
D) The molecules become fixed in a crystal structure.