A liquid takes the shape of its container but has a fixed volume because its molecules
Correct answer: B. are close together but free to slide past one another
- A. are held in fixed positions in a lattice
- B. are close together but free to slide past one another
- C. are very far apart and move independently
- D. have no kinetic energy at all
Explanation
Intermolecular forces in a liquid are strong enough to keep the molecules in contact, which fixes the volume, but not strong enough to hold them in place, so they flow and take the shape of the vessel. Fixed positions in a lattice describe a solid, and wide separation with independent movement describes a gas. A liquid is therefore intermediate in both structure and freedom of movement.
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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.
Practise Liquids
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