The word latent means “hidden”, “unseen”. Which one of the following statements best explains why heats of vaporization and melting are called latent?   A.  Because heats of vaporization and melting are zero.   B.  Because vaporization and melting are endothermic processes.   C.  Because these quantities are impossible to measure.   D.  Because absorption of heat during melting or vaporization does not result in a temperature increase.   E.  Because heats of vaporization and melting are positive quantities.

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Q: Boiling is the temperature at which the vapor pressure of the liquid exceeds the atmospheric…

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Q: Why are the boiling points different and what is the trend?

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.