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What happens to the energy of atoms in liquids and gases when they are heated and cooled?

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  • What happens to the energy of atoms in liquids and gases when they are heated and cooled?


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Answer #1 | 17/12 2013 15:17
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Answer #2 | 17/12 2013 18:45
When a substance is heated, the extra energy makes the atoms and molecules in the substance vibrate faster and, in liquids and gases, move faster. A measure of the average velocity of such movement is called temperature. The effect of this increased movement is to change the structure of the substance. The regular order of the atoms or molecules of a solid breaks down to form a liquid - this is called melting. Further heating makes the atoms or molecules move so fast that the interactive forces between them are overcome, and they become gases - in which the atoms or molecules are free to move throughout their enclosing volume. This is called boiling or evaporation. Cooling, or lowering the temperature, reduces the average speeds of the molecules. The molecules then have a better chance of sticking together. As you keep taking away heat, more and more molecules stick onto the liquid globs already formed. It's the same as evaporation but reversed. So in liquids when they are cooled, more heat is being away and it turns into solid (example, water turns into ice)
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Answer #3 | 18/12 2013 01:41
The energy shifts between molecular vibration in the substance and the surrounding environment
Positive: 38 %

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