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When a liquid is placed in an open vessel, it slowly escapes into gas phase, eventually leaving the vessel empty. This phenomenon is known as evaporation. Evaporationof liquids can be explained in terms of kinetic molecular model. Although there are strong inter-molecular attractive forces which hold molecules of a liquid together, the molecules having sufficient kinetic energy can escape into gas phase if such molecules happen to come near the surface. In a sample of liquid all the molecules do not have same kinetic energy. There is a small fraction of molecules which have enough kinetic energy to overcome the attractive forces and escape into gas phase. Evaporation causes cooling. This is due to the reason that the molecules, which undergo evaporation, are high-energy molecules; therefore the kinetic energy of molecules which are left behind is less. Since the remaining molecules have lower average kinetic energy therefore, temperature must be lower. If the temperature is kept constant the remaining liquid will have the same distribution of molecular kinetic energies and the high-energy molecule will keep on escaping from the liquid into the gas phase. If the liquid is taken in an open vessel, evaporation will continue until whole of the liquid evaporates.
* Three petridishes of diameter 10 cm with covers * 10 ml pipette * Stop watch * Acetone * Benzene * Chloroform * Clean and dry the petridishes and mark them as A, B, C. * Pipette out 10 ml of acetone to petridish A and cover it. * Pipette out 10 ml of benzene in petridish B and cover it. * Pipette out 10 ml of chloroform in petridish C and cover it. * Uncover all the three petridishes simultaneously and start the stop-watch. * Note the respective time when the liquids evaporate completely from each petridish. Petridish MarkLiquid TakenTime taken for complete evaporation A Acetone 53 min B Benzene 42 min C Chloroform 30 min The rate of evaporation of the given three liquids is in the order: Chloroform > Benzene > Acetone
What else can I help you with?
Scientist who discovered the leaf?
Adam
What famous scientist discovered raidum?
Marie Curie
The electron was discovered by?
Niels Borh, a Danish scientist, discovered this in 1913
What did Sir Isaac Newton do that was so special?
He discovered and invented different amazing stuffs that we would have never know about...he was a intelligent scientist who help to discover mystery of this world. He gave the law of gravity
Scientist who discovered nutrients?
some one i don't know who so
What have scientist already discovered about heat and evaporation?
that the more heat u have the quicker the evaporation
Who discovered law of constant proportions?
A scientist named proust discovered it in 1779 A.D.
Who is the scientist that developed the law of motion?
Sir Isaac newton discovered the Law of Motion.
Who discovered lenz's law?
SCIENTIST: Heinrich Friedrich Emil Lenz
Mathematician who discovered the law of gravity?
I suspect you are searching for the British scientist Isaac Newton.
Who discovered hooke's law?
Robert Hooke, an English scientist, first proposed Hooke's Law in the 17th century. Hooke's Law describes the relationship between the force applied to a spring and the resulting extension or compression of the spring.
Who is Avagodro?
He is the scientist that discovered Avogadro's Law/Number, which is the number of atoms, molecules, or particles in 1 mole of a substance.
What scientist is responsible for boyle's law?
Boyle's law is named after the scientist Robert Boyle, an Irish natural philosopher, chemist, physicist, and inventor. He discovered the relationship between the pressure and volume of a gas at constant temperature.
Who discovered the law of flotation?
The law of flotation was discovered by Archimedes, a Greek mathematician and scientist, in the 3rd century BC. He determined that an object will float in a fluid if the weight of the fluid displaced by the object is equal to the weight of the object itself.
Was Marie Curie a scientist?
yes, she is a scientist and discovered radiation.
Who discovered the gas law represented temperature and volume?
Charles, a French scientist with about 6 first/middle names, but the last name was Charles.
Who discovered water evaporation?
dr. shayne carter
