As a substance moves from a solid to a liquid 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. molecules move more frequently.
Explanation
During melting, the particles absorb heat, so their average kinetic energy increases rather than decreases. Disorder increases, intermolecular attractions become less effective, and particles move more freely and frequently. The likely mistake is choosing c by thinking that intermolecular forces completely disappear during melting, but they only become weaker.
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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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