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.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

b

explanation:

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