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why do liquids made up of long and flexible molecule have higer viscosity than liquids made up
of spherical molecules?
a. long and flexible molecule line up easily to resit flow
b. its easy for the long and flexible molecules to get tangled
c. long and flexible molecules interact very strongly w/ each other.
how does a liquid develop a vapor pressure?
a. the liquid is heated to it b.point then it develops vapor pressure
b. a fraction of the molecules of the liquid have enough enough kinetic energy to escpae into gas
phase.
c. any liquid heated to a temperature above its critical pt will have a vapor pressure
d. the molecule of the liquid have enough energy to flow the surface.
Solution
1 Ans. The viscosity of a liquid mainly depends on the intermolecular attraction and also the
shape of the molecule. If there is more intermolecular attraction, the liquid has more viscosity. If
the liquid has longer molecules, the molecules can get "tangled" easily and the liquid has more
viscosity than liquid which have spherical molecules.
Liquids with long and flexible molecules may or may not have intermolecular attraction but they
can get "tangled" easily which causes viscosity. So, option (b) is the right answer.
2 Ans.
When the molecules of the liquid has enough kinetic energy to overcome the intermolecular
force of attraction, the liquid undergo evaporation. If the evaporation is carried out in a closed
container, the vapor will undergo condensation and change to liquid form again. The process of
evaporation and condensation continue and eventually the rate of evaporation becomes equal to
the rate of condensation. That means, equilibrium is attained. The pressure that is exerted by the
vapor on the surface of the liquid when this equilibrium is achieved is called the vapor pressure
of the liquid.
So, option (b) is the right answer.

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why do liquids made up of long and flexible molecule have higer viscos.docx

  • 1. why do liquids made up of long and flexible molecule have higer viscosity than liquids made up of spherical molecules? a. long and flexible molecule line up easily to resit flow b. its easy for the long and flexible molecules to get tangled c. long and flexible molecules interact very strongly w/ each other. how does a liquid develop a vapor pressure? a. the liquid is heated to it b.point then it develops vapor pressure b. a fraction of the molecules of the liquid have enough enough kinetic energy to escpae into gas phase. c. any liquid heated to a temperature above its critical pt will have a vapor pressure d. the molecule of the liquid have enough energy to flow the surface. Solution 1 Ans. The viscosity of a liquid mainly depends on the intermolecular attraction and also the shape of the molecule. If there is more intermolecular attraction, the liquid has more viscosity. If the liquid has longer molecules, the molecules can get "tangled" easily and the liquid has more viscosity than liquid which have spherical molecules. Liquids with long and flexible molecules may or may not have intermolecular attraction but they can get "tangled" easily which causes viscosity. So, option (b) is the right answer. 2 Ans. When the molecules of the liquid has enough kinetic energy to overcome the intermolecular force of attraction, the liquid undergo evaporation. If the evaporation is carried out in a closed container, the vapor will undergo condensation and change to liquid form again. The process of evaporation and condensation continue and eventually the rate of evaporation becomes equal to
  • 2. the rate of condensation. That means, equilibrium is attained. The pressure that is exerted by the vapor on the surface of the liquid when this equilibrium is achieved is called the vapor pressure of the liquid. So, option (b) is the right answer.