Answer:
1. freezing equals melting - phase equilibrium
2. allows molecular attractions to increase - pressure cooling effect
3. PV=k - Boyle's Law
4. V/T=k - Charles' Law
5. temperature at which vapour pressure = atmospheric pressure - normal boiling point
Explanation:
<em>Phase equilibrium</em> is the stage at which the rate of freezing equals the rate of melting.
<em>Pressure cooling effect</em> allows molecular attractions to increase.
Boyle's Law states that at <em>constant temperature</em>, the pressure and volume vary with each other:
PV = constant (k)
Charles' Law states that at <em>constant pressure</em>, the volume and temperature vary with each other:
V/T = constant (k)
The temperature at which vapour pressure is equal to the atmospheric pressure is called the<em> normal boiling point</em>.