Predict which of the following pair will have the higher melting point and indicate why: KBr, Br2.

a. KBr: strong hydrogen bonding forces
b. KBr: strong ion-ion forces
c. KBr: strong dipole-dipole forces
d. Br2: strong LDF
e. Br2: strong covalent-network forces

KBr: strong ion-ion forces

Explanation:

Ionic compounds are non-molecular species. During melting they require a lot of energy input so that the strong ionic bonds that constitute the electrostatic lattice be disrupted. It thus requires very high temperatures. This is indicative of a very strong ion-ion electrostatic interaction which is typical of ionic bonds and results in high melting points of ionic solids.

Hence, the process of melting an ionic solid needs the addition of a large amount of energy in order to break all of the ionic bonds in the crystal.

On the other hand, Br2 is a covalent molecular specie. Most covalent compound have low melting points since their molecules are mostly held together only by weak van der waals forces.

d. temperate deciduous forest

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