Question

How does the solubility of a substance change with rise in temperature and fall in temperature?

Answer 1

Incresing in temperature increases the solubility of solid and liquids increasing the temperature always dresses the solubility of gases
when u add a solute to a solvent the kinetic energy of the solvent molecules overcome the attractive forces among solute particles

solute particles leave the surfaces of the solid and move into the dissolved phase . 
if we heat the solvent the average kinetic energies of its molecules increases hence the solvent is able to dislodge more particles from the surface of the solute
u can in this image by uploaded the mass of grey (-) balls and green (+) balls represent a salt crystal.
as the salt dissolves the positive and negative ions are pulled apart and become surrounded by water molecules.
so increasing the temperature increases the solubility of substance
example : sugar and salt are more soluble in water at higher temperature

Answer 2

The solubility of a substance increases with rise in temperature and decreases with fall of temperature.

Explanation:

• When the temperature rises, kinetic energy helps the solvent molecules to break apart the solute molecules that are kept together by intermolecular attraction.
• The addition of more heat increases the dissolving reaction by providing energy to break bonds between the molecules 9f the substance.
• When the temperature falls down the solubility decreases because the kinetic energy of the molecules also decreases.

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