physical science

posted by jan

why does the temperature of boiling water remain the same as long as the boiling continues?

Because it is a pure compound undergoing a phase change. The constant temperature is a requirement of the Gibbs Phase Rule. It is not obvious why this happens. If the compound is not pure, the tempertaure will rise as it boils off the most volatile components.

Heat is required to change the liquid water to steam (from liquid to gas). As long as there is water in the boiling pot, that process will continue; i.e., water will continue to boil and change from liquid to gas. AFTER all the water has been changed from liquid to gas, THEN (and only then) will the temperature of the steam begin to rise if additional heat is added.

  1. Brandon

    It takes allot of energy to vaporize water. Several BTUs for each change of state because it's changing the molecular structure. Not as much energy required to change temperature in same state.

Respond to this Question

First Name

Your Answer

Similar Questions

  1. Azeotrope

    I'm having trouble understanding what an azeotrope is. Any clarification is appreciated. Sheryl Two liquids with different boiling points normally can be separated by fractional distillation; i.e., the lower boiling point material …
  2. Chemistry

    Using the principles of bond breaking and bond making, how can I explain why there is no change in temperature in phase changes?
  3. science

    it asks for a one sentence rule about relationship between phase changes and temperature and rule about phase change and heat energy
  4. science

    Why does the temperature of boiling water remain the same as long as the heating and boiling continue?
  5. chemistry

    Is this statement accurate? the boiling point of the distilled water was 99°C. After five minutes, the temperature still stayed the same; it remained constant. The liquid was becoming a gas. Phase change means there is an energy change.
  6. Physics

    why does the temperature of boiling water remain the same as long as the heating and boiling continue?
  7. CHM

    Heat of fusion (¦¤Hfus) is used for calculations involving a phase change between solid and liquid, with no temperature change. For H2O, ¦¤Hfus=6.02 kJ/mol. Specific heat capacity (C) is used for calculations that involve a temperature …
  8. Chemistry

    Construct a cooling curve (looks the same as a heating curve) for a substance with a molar mass of 200 that has a gas phase specific heat capacity of 2.9J/g K, a boiling point of 525 K,a liquid phase specific heat capacity of 3.24 …
  9. Chemistry

    1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same?
  10. Physical Science

    1. which of the following should be classified as a suspension?

More Similar Questions