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1. Both A and B involves increasing the kinetic energy of the molecule resulting to evaporation in A and melting in B.

2. Both C and D involves in the less amount of heat resulting decreasing in kinetic energy of the molecules which result in condensation in C and Freezing in D.

Heat Energy can be transferred in three possible ways. By means of conduction, convection and radiation.

Heat Conduction:

• The transfer of heat from one material to another material or from the source to the material which the heat is being transferred by means of physical contact. Example is when you put directly the metal on the fire, the temperature of metal increases as it is being put in fire.

Heat Convection:

• The transfer of heat from the source going to the surrounding fluid like gas and liquid. Example, steam of hot coffee or tea. The heat from hot coffee transferred to the air as you can see the steam rises.

Heat Radiation:

• The Heat is transferred in a form of electromagnetic radiation. It has the same principle with heat conduction except that it has to direct physical contact involve.

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