Question

What happens to these physical properties as the strength of intermolecular forces increases?

My answers are there as well but its not correct

Increase or decrease?
a) melting point - increases
b) vapor pressure-increases
c) boiling point- increases
d) viscosity - decreases
e) surface tension - decreases

Answer 1

a) melting point - increases <b>OK</b>
b) vapor pressure-increases <b>As the IM forces increase, it makes it harder for the molecules to escape to the vapor phase (the pressure of the gas over the liquid); therefore, the vapor pressure must decrease.</b>
c) boiling point- increases <b>OK</b>
d) viscosity - decreases <b>As IM forces increase it makes it harder for the molecules to slide across each other; therefore, the viscosity must increase.</b>
e) surface tension - decreases <b>As the IM forces increase, it makes the molecules attract more strongly; therefore, surface tension increases.</b>

Answer 2

a) melting point - increases
b) vapor pressure- decreases
c) boiling point- increases
d) viscosity - increases
e) surface tension - increases