Converting Between Solid and Liquid

*A(solid): heating to $37° C$

B (solid-liquid Mixture): Icosane melts at $37° C$

thermal energy - absorbed from surroundings and temperature of icosane is at its melting point
particles with increased energy at $37° C$ → can overcome strong forces of attraction in solid state
orderly packing arrangement of particles is disrupted
Both solid and liquid are present during the melting process
Temperature remains constant until all icosane has melted as all the thermal energy is used to overcome the strong forces of attraction between icosane particles in the solid state.

C(liquid): Heating beyond $37° C$

After all solid icosane has melted at point [], thermal energy is again converted to KE of the particles
Particles can move freely throughout the liquid
Temp of liquid rises beyond 37 degrees Celsius

A(liquid): Cooling to 37 Degree Celsius

Kinetic energy of particles, converted to thermal energy - transferred to surroundings.
With less KE, particles slow down
Temp of liquid reduces to 37 degrees Celsius

B(liquid-solid mixture): Icosane freezes at 37 Degree Celsius

Particles lose energy to surroundings and the temperature is at the freezing point

Particles with less energy - drawn closer together by strong forces of attraction between them as the particles do not have sufficient energy to overcome the strong forces of attraction between them.
Particle arrangement becomes more orderly (originally was disorderly).
Both solid and liquid present during the freezing process
Temperature remains constant throughout the freezing process until all icosane has solidified. Why? As all kinetic energy lost is used to change from liquid to solid.**

C(solid)Cooling below 37 Degree Celsius

After all liquid - solidified at point []
KE of particles is again converted to thermal energy and transferred to surroundings
Particles can vibrate / rotate only about their fixed positions
Temperature of solid reduces below 37 degrees celsius

Quartz 4