The viscosity of a liquid
Correct answer: C. decreases as the temperature rises
- A. increases as the temperature rises
- B. is independent of temperature
- C. decreases as the temperature rises
- D. is a measure of how quickly it evaporates
Explanation
Viscosity is resistance to flow and it depends on the intermolecular forces, so heating a liquid gives the molecules more kinetic energy to overcome those forces and the liquid flows more freely. This is why engine oil thins in a hot engine and why honey pours easily when warmed. Gases behave in the opposite way, becoming more viscous when heated.
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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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