Problem: Examine the heating curve for water.Explain why the curve has two segments in which heat is added to the water but the temperature does not rise.

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We have to describe why the heating curve of water has segments where heat is added to the system, but the temperature does not rise.


We can see that the two segments are represented as horizontal lines and they are at the melting point and the boiling point of water.

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Problem Details

Examine the heating curve for water.

The graph depicts heat added in kilojoules per mole, versus temperature, in degrees celsius. The line graph is broken into five sections. Section one represents ice warming, with the graph having a positive slope. It begins at the point (0,-25), and ends at (2,0). Section two represents ice melting to liquid, and has a slope of zero. It begins at (2,0), and ends at (6,0). Section three represents liquid water warming, having a positive slope. It begins at (6,0), and ends at (15,100). Section four represents the liquid water vaporizing to steam, having a slope of zero. It begins at (15,100), and ends at (55,100). Section five represents steam warming, having a positive slope.  It begins at (55,100), and ends at (57,125).

Explain why the curve has two segments in which heat is added to the water but the temperature does not rise.