Explain the following trend in the boiling points of the compound listed. Why is H 20 atypical? Compound boiling point H₂Te H₂Se H₂S H₂O C. CH3CHO d. (CH3)20 e. CH3CN -2 °C -41.5 °C -60.7 °C Identify the compound with the highest vapor pressure. a. CH3OCH3 b. CH3CH₂CH3 +100 °C c. C6H6 d. H₂Se e. (CH3)2SO Choose the substance with the lowest boiling point. a. CH3SeCH₂CH3 b. CH3CH₂CH₂CH3

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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.