Topic 16: Phase Change and IMF, Video C: Predicting Physical Properties

Question 1

Given that water (H20) has a boiling point of 100 degrees celsius and ammonia (NH3) has a boiling point of -33 degrees C, which of the the following is correct?

A. H20 has stronger IMF than NH3

B. H20 has weaker IMF than NH3

C. The strength of the IMF of H20 and NH3 are the same.

D. We cannot tell anything abou the IMF of H20 and NH3.

Answer 1

A. H20 has stronger IMF than NH3.

Question 2

Given that C4H10 has weaker IMF than C6H14, which has a higher vapor pressure?

A. C4H10

B. C6H14

C. Their IMF are the same.

Answer 2

A. C4H10

Question 3

Which property of a liquid decreases as the strength of the intermolecular forces increases?

A. Normal boiling point.

B. Normal melting point.

C. Vapor pressure.

D. All of the above.

Answer 3

C. Vapor pressure.