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Phase changes are whenever the phase (solid, liquid, or gas) of a compound changes. The temperature stays constant during the change because the energy is being used to break the bonds that are holding that compound in that specific phase.
A phase change is a change from one state (solid, liquid, or gas) to another. Because heat is required during melting or boiling (phase transition), the temperature of the sample remains constant even though heat is being supplied.
Temperature remain constant during a phase change, because the increase in internal energy would be used to break intermolecular forces and to increase the distance between molecules. For example, the density of gas is less than that of liquid, which is less than that of solid.
Phase changes are literally just changes from different states of matter (solid, liquid, etc.). Temperature does not change, because the energy that is being added to the material is all going toward changing the phase (e.g from solid to liquid, the molecules are excited and they move faster so the intermolecular forces are weakened and the molecules move around more).
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