Problem: Refer to the figure below to answer each question.A sample of steam begins on the line segment labeled 5 on the graph. Is heat absorbed or released in moving from the line segment labeled 5 to the line segment labeled 3? What is the sign of q for this change?

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Going from line segment 5 → 3

  • Phase changes from gas → liquid
  • Temperature decreases from 5 → 3 
  • condensation and cooling


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Problem Details

Refer to the figure below to answer each question.
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).

A sample of steam begins on the line segment labeled 5 on the graph. Is heat absorbed or released in moving from the line segment labeled 5 to the line segment labeled 3? What is the sign of q for this change?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Heating and Cooling Curves concept. You can view video lessons to learn Heating and Cooling Curves. Or if you need more Heating and Cooling Curves practice, you can also practice Heating and Cooling Curves practice problems.

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