When two pure substances are mixed to form a solution
A)heat is released.
B)heat is absorbed.
C)there is an increase in entropy.
D)there is a decrease in entropy.
E)entropy is conserved.

Question

Quizplus · Accepted Answer

When two pure substances are mixed to form a solution, there is an increase in entropy since the molecules become more dispersed and have greater freedom of motion. This is in accordance with the second law of thermodynamics which states that the entropy of a closed system always increases over time. There is no net release or absorption of heat since it would depend on the specific substances being mixed and their individual enthalpy changes.

When Two Pure Substances Are Mixed to Form a Solution