Given below are the vapor pressures, in torr, at 25°C for three substances. Normal boiling points for all three substances are given in the second column. Based on the vapor pressures, match the correct normal boiling points of these substances:   Premise:                                                      Response: Formic acid (43.1 torr)                               A. 40.0 degrees Celsius Ethanediol (0.075 torr)                              B. 101 degrees Celsius Dichloromethane (436.5 torr)                   C. 197.3 degrees Celsius

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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.