Entropy
1st case
5th case
3rd case
4th case
2nd case
Lamya AlJehani
Najla AlHusain
Yara AlKahtani
11D
Entropy changes associated with changes in state. Entropy increases as a substance changes from a solid to a liquid and from a liquid to a gas.
ΔS(system) is positive
ex: vaporization of water
The dissolving of a gas in a solvent always results in a decrease in entropy. Therefore, when a gas is dissolved in a liquid it limits its randomness and movement causing a decrease in entropy
ΔS(system) is negative
ex: dissolving of carbon dioxide in soda
Assuming no change in physical state occurs, the entropy of a system usually increases when the number of gaseous product particles is greater than the number of gaseous reactant particles
ΔSsystem is positive
ex: two molecules of gas react and three molecules of gas are produced.
Entropy increases when a solid or liquid dissolves in a solvent. When the solute dissolves in the solvent, its particles become more free.
ΔS(system) is positive.
ex: dissolving of sodium chloride in water.
The random motion of the particles of a substance increases as its temperature increases. When temperature increases, kinetic energy increases and particles move more freely causing entropy to increase.
ΔS(system) is positive.
ex: increasing temperature