Question

a)Rank the following 3 tetrachloride compounds in terms of increasing boiling point: carbon tetrachloride (CCl4), methane (CH4), dichloromethane (CH2Cl2)

b) Which molecule ( KI or LiF ) has the higher boiling point?

c)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 Van der Waals forces than the lower melting
- The higher melting molecule has greater Van der 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.
- onic bonds are weaker than hydrogen bonds
- The higher boiling molecule is ionic and the other is not.
- Ionic bonds are stronger than Van der Waals forces
- The lower boiling molecule is ionic and the other is not.
- Ionic bonds are weaker than Van der Waals forces

Answer 1

a) CH4 < CH2Cl2 < CCl4
b) LiF
c) - Both molecules are ionic but the higher melting has a larger cohesive energy

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