The pressure above a pure sample of solid Substance X at –184. °C is raised. At what pressure will the sample melt? Use the phase diagram of X below to find your answer. 12 solid liquid gas 100 300 temperature (K) Note: your answer must be within 0.75 atm of the exact answer to be graded correct. pressure (atm)

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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.