1. a) Which one of the following is expected to have the highest vapor pressure

Question

1.

a) Which one of the following is expected to have the highest vapor pressure at room temperature? ( Ethanol bp = 78 degrees Celsius, Methanol bp =65 degrees Celsius, Diethyl ether bp = 35 degrees Celsius, Acetone bp = 56 degrees Celsius )

b) Which of the following species are NOT capable of hydrogen bonding as pure substances? ( C3H8, CH3COOH, CH3CH2OH, HCI )

c) True or False: Liquids that have strong intermolecular forces generally have higher viscosities than those that have weak intermolecular forces.

d) Graphite crystallizes as what type of crystal? ( Ionic, Covalent, Molecular, Metallic )

e) Which one of the following substances crystallizes as a molecular crystal? ( NaCI, Na, SiO2, CO2 )

f) Which one of the following statements is NOT true in regards to water? ( Water has a high heat capacity, Water has an unusually high boiling point for such a small molecule, Water can form hydrogen bonds, Ice is more dense than liquid water, Water is a polar molecule )

g) List the type(s) of intermolecular forces that exist in each of the following substances:

CH3CI

H2O

KCI

CH4

Explanation / Answer

a) answer: Acetone

   by increasing vapor pressure of solvent,boiling point decreases.

b) answer: C3H8

C3H8 is a hydrocarbon,results no formation of H-bonding.because of unavailablity of high electronegative atoms F,O,Cl..etc

c) True,

As the strengths of intermolecular forces increase, surface tension, viscosity, melting point and boiling point increases, while vapor pressure decreases

d) Covalent

e) CO2.

f) Ice is more dense than liquid water : not true

g)

CH3Cl = dipole-dipole interactions

H2O = Hydrogen bonding

KCl = electrostatic forces

CH4 = disperson forces.

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