The amount of energy a substance has during a phase change ____________ . Select the best answer.
A
increases
B
decreases
C
increases or decreases
D
doubles or halves

Answer:

C

increases or decreases

Explanation:

The energy that is changing during a phase change is potential energy. During a phase change, the heat added (PE increases) or released (PE decreases) will allow the molecules to move apart or come together.

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The amount of energy a substance has during a phase change increases or decreases. The substance's temperature stays constant during a phase shift. The substance's average kinetic energy does not vary as it transitions between its phases, but its average potential energy does. Thus, option 'C' is the correct option.

Potential energy is the type of energy that is transforming during a phase transition. The heat added (PE increases) or released (PE drops) during a phase shift will let the molecules move apart or join together. By overcoming the intermolecular forces of attraction, heat absorption allows the molecules to migrate further apart. The latent heat of fusion is the name given to the energy absorbed during the phase shift.

There is no increase in the kinetic energies of the particles, and hence no rise in temperature, because the energy required for phase shifts is employed to break bonds. Similarly to this, energy is required to evaporate a liquid in order to defeat the attraction interactions between the liquid's particles.

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