Heating Curve of Water EvaporationSteam 100 Condensation 50 Water Melting Freezi

Question

Heating Curve of Water EvaporationSteam 100 Condensation 50 Water Melting Freezing Joules csmg he on e as The graph above shows the heating curve of water. One can plot heating curves by measuring the increase in temperature of a given amount of ice, water or steam as a function of heat that is added at a constant rate. The first slope (from A to B) refers to the change in temperature of ice as heat is added. At the melting point of ice (B) the temperature remains constant until all of the ice is melted. The graph between C and D represents the increase in the temperature of water, until the boiling point is reached (D). At the boiling point the temperature of the water remains constant until all of the water is converted into steam (from D to E). The last portion of the curve (from E) represents the heating of steam. t ihe rehe Determine if the following statements are True or False Select all that are True. Condensation is an exothermic process because the system gives off energy. Evaporation is an exothermic process because the system gives off energy. Heating water (from C to D), decreases the kinetic energy of water. Heating steam is an exothermic process which decreases the internal energy of the system. The water in the system is undergoing a reversible process at 273K and 1 atm pressure. Under these conditions, both melting and freezing may occur As steam condenses, the surroundings are absorbing energy from the system. The heat of vaporization is the energy required to break some of the hydrogen bonds during the melting process. The melting of ice is an exothermic process because the system absorbs energy.

Explanation / Answer

Statements based on heating curve:

1. True

Condensation is conversion of vapour to liquid in which energy is released.

2. False

Evaporation is conversion of liquid to vapour. So energy is absorbed

3. False

In heating from C to D temperature of water increase so kinetic energy also increases.

4. False

Heating steam increase temperature and hence internal energy.

5. True

It represent water and ice equilibrium.

6. True

Condensation is exothermic.

7. False

8. False

Melting is conversion of solid to liquid so endothermic

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