For a substance to change from a gas to a liquid, its particles A. must lose enough of their kinetic energy that their motion is influenced by the attractions between them.
We want to know what change takes place when the particles of a substance that goes from gas to liquid. We need to consider that:
- In a gas, the particles move freely, with great kinetic energy and the attraction forces between them are negligible.
- In a liquid, the particles have some degree of movement, although less than in the gas state and the attraction forces are higher.
For a substance to change from a gas to a liquid what must happen to its particles:
- A. they must lose enough of their kinetic energy so that their motion is influenced by the attractions between them. TRUE. The attraction between the molecules causes them to move less in the liquid state.
- B. they must gain enough kinetic energy to allow them to move freely while still being attracted to one another. FALSE. Liquids have lower kinetic energies than gases.
- C. They must lose enough of their kinetic energy so that the attractions between them hold in place as they vibrate. FALSE. Even though they must lose kinetic energy, they still have some left to move rather than just to vibrate.
- D. They must gain enough kinetic energy to break out of their ridged structure and move independently. FALSE. Liquids have lower kinetic energies than gases.
For a substance to change from a gas to a liquid, its particles A. must lose enough of their kinetic energy that their motion is influenced by the attractions between them.
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