Complete the following statements about the effect of intermolecular forces on the physical properties of a substance.

(a) The higher the boiling point of a liquid, the (stronger, weaker) are its intermolecular forces.

(b) Substances with strong intermolecular forces have (high, low) vapor pressures at room temperature.

(c) Substances with strong intermolecular forces typically have (high, low) surface tensions.

(d) The higher the vapor pressure of a liquid at a given temperature, the (stronger, weaker) are its intermolecular forces.

(e) Because nitrogen, N₂, has (strong, weak) intermolecular forces, it has a (high, low) critical temperature.

(f) Substances with high vapor pressures at room temperature have correspondingly (high, low) boiling points.

(g) Because water has a high boiling point, it must have (strong, weak) intermolecular forces and a correspondingly (high, low) enthalpy of vaporization.