Energy change associated with phase change in substances is either endothermic (energy added to system) or exothermic (energy removed from system). Condensation is but one term in six (6) describing phase change occurring when energy change is involved. The following table, in general, summarizes the related effects of energy change as applied to phase change.

Process Phase Change Energy Change*

Condensation gas => liquid Exothermic

Evaporation liquid => gas Endothermic

Freezing liquid => solid Exothermic

Melting solid => liquid Endothermic

Sublimation solid => gas Endothermic

Deposition gas => solid Exothermic

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* Energy Change terms:

Endothermic => Addition of heat energy

Exothermic => Removal of heat energy

7 0

3 years ago

Arrange follwoing substances from lowest to highest lattice energy" MgS, KI, GAN, LiBr

sleet_krkn [62]

Answer: KI, LiBr, MgS,GaN

Explanation:

Ionic sizes are the deciding factor in lattice energy. The smaller the ion, the higher the lattice energy. Since K+> Li+ and I- is larger than Br-, LiBr will have a higher lattice energy. The size of the sulphide ion is much smaller than the nitride ion but the Gallium is much smaller due to lanthanide contraction hence the answer.

7 0

3 years ago