Question

OBJECTIVE 3 OBJECTIVE 4 41. Acetone, CH3COCH3, is a laboratory solvent that is also commonly used as a nail polish remover. a. Describe the submicroscopic events taking place at the surface of liquid acetone when it evaporates. b. Do all of the acetone molecules moving away from the surface of the liquid escape? If not, why not? What three criteria must be met for a molecule to escape from the surface of the liquid and move into the gas phase? c. If you spill some nail polish remover on your hand, the spot will soon feel cold. Why? d. If you spill some acetone on a lab bench, it evaporates much faster than the same amount of acetone in a test tube. Why? e. If you spill acetone on a hot plate in the laboratory, it evaporates much more quickly than the same amount of acetone spilled on the cooler lab bench. Why? OBJECTIVE 5 OBJECTIVE OBJECTIVE 9

Answer 1

Acetone (propanone) is a laboratory solvent, commonly used as a nail polish remover.

a. Submicroscopic events taking place at the surface of acetone when it evaporates: Because of low boiling point acetone has tendency to evaporate at room temperature, the molecules absorbs energy from liquid for evaporation and liquid feels cold on touch, to maintain equilibrium

b. No, all the molecules moving away from the surface of the liquid do not escape. There is no Hydrogen bond in acetone. Bonds present in this are weak.

For change of a liquid molecule to gas phase, the vapour pressure should increase, it should have considerable surface area directly in contact with air

c. The spot of nail polish remover feel cold on hand because when it spill on hand the equilibrium of liquid gets disturbed. In order to get stability molecules absorb energy from that area of hand and gets converted to gas phas and therefore it feels cold for a while.

d. Because of increasing surface area.

e. Because temperature of hot plate is more than the room temperature so evaporates fasten.

Answer 2

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Posted above are the most vague answers, not scientifically up to par to use in even a chemistry 101 course.