Equal amounts of which of the following substances would have the highest vapor pressure at 75°C? a. Diethyl ether b. Ethanol c. Water d. Octane (normal boiling point = 126°C) e. Ethylene glycol   Which of the following would be the least viscous (i.e., have the least resistance to flow)? a. Octane at 110°C

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Q: Which compound would you expect to have the highest boiling point?

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Q: 22. Which of the following is most volatile? b. CCI3H a. CBr,H2 c. CBR4 d. CCI4 e. CF4

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Q: 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 Temperature (degrees C) Pressure (atmospheres) 00- 100

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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.