Change of states (把這圖背掉, 但不用背 sublimation 跟 Deposition)

Cooling curve (較大機會要你看圖答問題)

E.g. cooling curve of naphthalene 萘

 

AB – liquid cooling

 

BC – liquid solidification (轉state, liquid → Gas)

 

CD – solid cooling to room temp.

 

n            AB drops steadily.

 

u   Shows ↓temp. of liquid

 

n            BC is flat

 

u    Temp. remains constant

 

u    Substances solidifying

 

n            CD Drops steadily

 

u    Shows ↓temp. of liquid

Freezing point: read from flat part BC of the curve (E.g.: 80℃)