9. Define melting point of a solid. At what temperature in the Kelvin scale does ice melt? In the
experiment to determine the melting point of ice, why does the temperature not rise till all the ice melts
even though heat is continuously supplied? What is this heat energy called?
10. What is effect of temperature on solubility of solids in liquids?
Answers
Answer:
9.The melting point of a solid is the temperature at which it changes to liquid state. The melting point of ice is very close to 273.15 K.
The heat supplied to ice at its melting point is used up by the ice molecules for the change of state process, i.e., the ice molecules uses the heat supplied to break intermolecular attraction so that the ice melts into water. As this heat energy is absorbed by ice without showing any rise in temperature, it is considered that it gets hidden into the contents of the beaker and is known as the latent heat of fusion.
Thus, we can define latent heat of fusion as the amount of heat required to convert a unit mass of a solid into its liquid state, without a change in temperature.
10.For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Explanation:
(9 latent heat
(10 it is flow like liquid (e. g. slime