Why does an evaporating liquid cool down according to the kinetic molecular theory?

Loss of molecules with high kinetic energy causes cooling of liquid during evaporation

Explanation:

According to kinetic molecular theory, molecules which tend to evaporate or leave bulk liquid should possess kinetic energy higher than threshold kinetic energy. This threshold kinetic energy is the highest possible kinetic energy of a molecule can possess to stay inside a liquid.

Now, as we know, that kinetic energy of molecule is proportional to temperature. Therefore loss of these high energy molecules during evaporation causes lowering of temperature.

The question is incomplete and the options are not given but here are d options from another website.

a. Electronegativity increases as you move to the right of the periodic table.

B. Electronegativity is the ability of an atom to attract electrons.

c. A very electronegative atom easily gives up electrons.

d. Electronegativity increases with a decreased number of protons.

The correct options are

a. Electronegativity increases as you move to the right of the periodic table.

B. Electronegativity is the ability of an atom to attract electrons.

d. Electronegativity increases with a decreased number of protons.

Explanation:

This is because Electronegativity is the ability of an element to attract pair of electrons to itself.

Electronegativity increases as a result of increase in protons and when there is more electron pull.

As, the size of an element decreases, the valence electrons are attracted near to the nucleus. Therefore, there is increase in attraction between shared electron and nucleus.