The amount of energy needed to melt a substance at its melting point is called the heat of fusion and for water the value is 6.01 kJ/mol. The amount of energy needed to vaporize a substance at its boiling point is called the heat of vaporization and for water the value is 40.7 kJ/mol. Use the relative distances in the states of matter and the concepts intermolecular forces to explain the difference.

iron and sleel

make siroeel

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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