When a substance dissolves in water,heat energy is released if:
A)The lattice energy is positive.
B)The hydration energy is positive.
C)The hydration energy is more negative than the lattice energy is positive.
D)The hydration energy is negative.
E)None of these (A-D).

Question

Quizplus · Accepted Answer

When a substance dissolves in water and heat energy is released, it means the process is exothermic. This occurs when the hydration energy (energy released when ions are surrounded by water molecules) is more negative than the lattice energy (energy required to separate the ions in a solid) is positive. This means that more energy is released during hydration than is consumed to break the lattice, resulting in a net release of energy.

When a Substance Dissolves in Water,heat Energy Is Released If