Science - 2018-19

PS.7 b - Phases Changes

The student will investigate and understand temperature scales, heat, and thermal energy transfer. Key concepts include

b) phase change, freezing point, melting point, boiling point, vaporization, and condensation.

Bloom's Levels:  Analyze; Understand

Adopted: 2010


  • Matter can undergo a variety of changes, both physical and chemical.

  • I can determine how long it will take for frozen chicken to defrost so I can cook it.


  • As thermal energy is added to or taken away from a system, the temperature does not always change. There is no change in temperature during a phase change (freezing, melting, condensing, evaporating, boiling, and vaporizing) as this energy is being used to make or break bonds between molecules.


In order to meet this standard, it is expected that students will

b) illustrate and explain the effect of the addition or subtraction of thermal energy on the motion of molecules.

     analyze a time/temperature graph of a phase change experiment to determine the temperature at which the phase change occurs (freezing point, melting point, or boiling point).


Celsius temperature scale, Kelvin temperature scale, absolute zero, heat, temperature, phase change, freezing point, melting point, boiling point, vaporization, condensation, conduction, convection, radiation, heat transfer

Updated: Jun 29, 2018