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In my book there is a separate discussion given for trends in melting and boiling points in each chapter in inorganic chemistry (the chapters on the various groups like group 15, group 16, etc.) and organic chemistry (the chapters on the various classes of organic compounds like alcohols, phenols, carboxylic acids, etc.). It is very confusing.

So I thought that maybe making a list of the various factors on which the melting and boiling points depend upon and then applying the concepts would be much more efficient and easy.

What are the factors on which melting and boiling points of substances depend upon and what are the respective variations? Some of the factors, as I have found out are: atomic radius, molecular mass and intra- and inter-molecular H-bonding and surface area.

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    $\begingroup$ Unfortunately, there is still no uniform model. The trends based on the factors you've listed work best for homologous compounds, hence the separation into realms of organics/inorganics, element groups and classes of compounds. $\endgroup$ – andselisk Jan 29 at 13:18

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