Which molecule ( KI or LiF ) has the higher boiling point?
Select the single most important reason below to justify your choice should have the higher melting point
Both molecules are nonpolar but the higher melting includes hydrogen bonding
Both molecules are nonpolar but the higher melting is more polarizable
The higher melting molecule is polar and the other is not
The lower melting molecule is polar and the other is not
The higher melting molecule has smaller vander Waals forces than the lower melting
The higher melting molecule has greater vander Waals forces than the lower melting
The higher melting molecule is ionic and the other is not
The lower melting molecule is ionic and the other is not
The higher melting molecule has hydrogen bonds and the other does not
The lower melting molecule has hydrogen bonds and the other does not
Both molecules are ionic but the higher melting has a larger cohesive energy
Both molecules are ionic but the lower melting has a larger cohesive energy
The higher melting molecule is ionic and the other is not.
Ionic bonds are stronger than hydrogen bonds
The lower melting molecule is ionic and the other is not.
Ionic bonds are weaker than hydrogen bonds The higher boiling molecule is ionic and the other is not.
Ionic bonds are stronger than vander Waals forces The lower boiling molecule is ionic and the other is not.
Ionic bonds are weaker than vander Waals forces
LiF
"Both molecules are ionic but the higher melting point has a larger cohesive energy"
To determine which molecule, KI or LiF, has the higher boiling point, we need to consider the intermolecular forces present in each compound.
KI is an ionic compound, consisting of potassium cations (K+) and iodide anions (I-). LiF is also an ionic compound, composed of lithium cations (Li+) and fluoride anions (F-).
Ionic compounds have strong ionic bonds due to the electrostatic attraction between the positive and negative ions. This results in high boiling points.
On the other hand, LiF has a smaller cation (Li+) and a smaller anion (F-) compared to KI. Smaller ions generally have stronger electrostatic interactions, leading to stronger ionic bonding and higher boiling points.
Therefore, the correct choice would be:
- The higher melting molecule is ionic and the other is not.