Practice Quiz

MCAS Chemistry Exam Practice

Category - Chemistry

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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?
  1. The molecules move more freely.
  2. The molecules lose electrical charge.
  3. The molecules break apart into atoms.
  4. The molecules become fixed in a crystal structure.
Explanation
Answer: A - The molecules move more freely.
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