Refer to the following phase diagram (not to scale!) for sulfur dioxide: P atm 78 1.00 0.0017 197.6 200.4 263.1 Choose all that apply T Kelvin A sample of sulfur dioxide at a pressure of 1.00 atm and a temperature of 203 K is heated at constant pressure to a temperature of 226 K. Which of the following are true? 430.7 The final state of the substance is a liquid. O No phase change will occur. The liquid initially present will solidify. The sample is initially a liquid. The sample is initially a solid.

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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.