Acetone, CH3COCH3, is a laboratory solvent that is also commonly used as a nail

Question

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?

Explanation / Answer

d) Answer : as surface area increases when acetone spills on lab bench it evaporates faster than kept in a test tube where it gets less surface area in contact with air as larger the surface area accelerates the evaporation

e) Answer : the rate of evaporation of solvent increases with increase in temperature hence acetone on a hot plate evaporates quickly than on cooler lab bench

C) answer : acetone is a volatile solvent so it absorbs much heat when evaporating and your skin gets colder, so acetone cools down your skin more easily when evaporating

a) answer : in acetone the intermolecular force of attraction is weaker hence it evaporates quickly as air comes in contact with the acetone molecule it comes in contact with oxygen and gets evaporate

b) answer : pure acetone on evaporation do not left residue, for an molecule to escape from surface of liquid to air should have sufficient kinetic energy to overcome the intermolecular attraction forces

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