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Solution: At 25 gallium is a solid with a density of 5.91 g/cm3. Its melting point, 29.8 , is low enough that you can melt it by holding it in your hand . The density of liquid gallium just above the melting point is 6.1 g/cm3.Based on this information, what unusual feature would you expect to find in the phase diagram of gallium?

Problem

At 25 gallium is a solid with a density of 5.91 g/cm3. Its melting point, 29.8 , is low enough that you can melt it by holding it in your hand . The density of liquid gallium just above the melting point is 6.1 g/cm3.

Based on this information, what unusual feature would you expect to find in the phase diagram of gallium?


The figure shows a metal melting in a hand.

Solution

We’re asked to draw the phase diagram of gallium to determine its unusual feature based on the given information:


  1. At 25°C gallium is a solid with a density of 5.91 g/cm3. 
  2. Its melting point, 29.8°C, is low enough that you can melt it by holding it in your hand
  3. The density of liquid gallium just above the melting point is 6.1 g/cm3.

Recall that a phase diagram shows the transition of matter between solid, liquid, and gas phases as temperature and pressure changes.


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