When substance moves from a solid to a liquid state all of the following changes occur except__________________?
Correct answer: B. K.E of the molecules decreases
- A. Molecules become more disordered
- B. K.E of the molecules decreases
- C. Intermolecular forces become weaker
- D. Molecule become further separated
Explanation
During melting, molecules become more disordered, move somewhat farther apart, and experience weaker intermolecular attractions. Heat supplied at the melting point increases potential energy rather than decreasing the molecules' kinetic energy, so option b is the exception. Students may choose option c by overlooking that intermolecular forces are weakened during melting.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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