Question 19
Change of State and VapoursIn an experiment in which molten naphthalene is allowed to cool, the cooling curve in Fig. 5 was obtained. The temperature 80°C is known as the
- A.cooling temperature
- B.boiling point
- C.melting point
- D.vaporization point
Show the answer and explanation
Answer: C (melting point)
Explanation
The flat part of the cooling curve at 80°C is where the liquid solidifies at constant temperature; this is the melting (freezing) point.