Question

a)    What is the effect of vapor pressure on a liquid’s boiling point?  In your answer explain     what two pressures must be equal in order for a substance to boil.  How could you make a substance boil at a higher temperature?

 b) What is the difference between intermolecular and intramolecular forces (define each)? also give an example of each.

c) Draw a diagram of NH2F molecules as they boil, and use Lewis Structures to label the most  important intermolecular force and indicate the difference in intermolecular distance in the two phases.

Answer 1

e.g. metallic bonds, ionic boods and Covalent bonds. intramolecular bonds or simply bonds I Lewis structure of NHF It - - Z - IF entomolecular force between two NHLE molecule The intermolechar hydrogen bonding is essential for the molecule. when who is boiled then the intermoleculer bond length increases.

Sew molecules of liauid go into the go 1. Effect of Vapor pressure on a liauids boiling point: Every Lianid has what is called vapor pressure Basically, gascon phase and id go into the i gaseous phase turn back to liauid, this exists In an concilibrium condition. Now this gasens phase of the liauid exerts exerts the the pressure pressure over the over- surface is called vapor pressure Boiling point is defined as the temparature at which vapor pressure is canal to atmospheric pressure. When we increase of on decrease as the surrounding, pressure, vapor pressure also increase or decrease respectively. So when we increase the surrounding pressure, vapor pressure increases, and hence there is a lesser gap between the vapor pressure and the atmospheric pressure. So vapor pressure can be canal to surrounding pressure at a lesser temparature. If the atmospheric pressure is high then molecules need more energy which in turn reanires higher temparature, ie. boiling point © Intermolecular forees : Intermolecular forces are the forces that hold molecules in a substance So intermolecular forces formed between molecules. ex dipole - dipole interaction, hydrogen bonds H i ntermolecular bonds. Intramolecular forees Intramolecular forces are the forces that occurs within a molecule or ionic Compounds These are the forces that holds atom in a molecule or Compound.