Question

1.Heat is added to boiling water. Explain why the temperature of the boiling water does not change. What does change?

2.How does the boiling of a liquid differ from its evaporation?

Answer 1

Following is the - complete Answer -&- Explanation: for the given: Questions: in.....typed format....

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Question - (1):

Answer -&- Explanation:

When Heat: is added to boiling water: the temperature of the boiling water: doesn't change, i.e. temperature remains constant: because, when the water is boiling: we can certainly say that the given water: has reached its boiling point; and consequently , at its boiling point; when any further heat is added, it ONLY, acts as the latent heat: of the given mass of water, until all of the water: in the sample, changes into vapor/ steam, and until then, the temperature doesn't increase above the boiling point: of the given sample of water, even when heat is added to it.

The added heat, to the boiling water - only serves the purpose of changing the phase: of the given sample of water, i.e. changes the liquid water to steam ( i.e. the vapor phase ).

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Question - (2):

Answer -&- Explanation:

Following are the differences between the evaporation and boiling: of a Liquid:

1. A liquid boils at a specific temperature; whereas it can evaporate : at any temperature, below its boiling point.
2. A liquid boils; from throughout the body of the liquid: whereas, it can evaporate: ONLY, from the surface of the liquid.
3. No bubbles: form in case of evaporation: whereas bubbles form profusely, during boiling.
4. In case of boiling: the value of the vapor pressure: of the liquid: equals OR, exceeds the surrounding ( atmospheric ) pressure: whereas, in case of evaporation: for the liquid under consideration: the vapor pressure doesn't exceed the surrounding pressure.
5. Evaporation process is considerably slow process; if compared with the process of boiling, which is considerably faster.

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