Question

1) Define the following:
a) Melting point b) Boiling point
c) Latent heat of fusion
d )Latent heat of vaporisation
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Answer 1

Answer:

1 The melting point of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.

2 The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding environmental pressure.

3 The heat of fusion, also known as the latent heat of fusion, is a category of latent heat describing the energy for the phase change between a liquid and a solid to occur without a change in temperature. ... Latent heat is the heat per mass unit required for a phase change to occur

4 Latent heat of vaporization is a physical property of a substance. It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. It is expressed as kg/mol or kJ/kg. ... The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol.

Explanation:

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Answer 2

Explanation:

a) the temperature at which a given soild melt

b) the temperature at which a liquid boils and turns to vapour

c) leatent heat energy absorbed or relesed by a substance during change into physical state that occurs without changing its temperature.

d) latent heat vaporization is a physical property of a substance when material in liquid state it given energy , it charges it phase from liquid to vapour without change in temperature.