Directions. For the following questions used the table of physical properties of

Question

Directions. For the following questions used the table of physical properties of compounds on page 77 as your source for possible identities. 1. Is benzophenone a liquid or solid at room temperature? How do you know? Which solvent(s) would you expect benzophenone to dissolve in? 2. Why must you determine if your thermometer is reading accurately before you determine the bolling point of your liquid unknown? What would you do if you determine that it is NOT reading accurately? 3. A student tested her liquid unknown and determined the density to be 0.85 g/ml, the boiling point to be 108 C, and that the liquid is insoluble in water, soluble in cyclohexane, and partially soluble in ethanol. What is the best conclusion about the identity of the liquid unknown? 4. After gathering the data for his solid unknown, a student cannot decide between two or the possibilities in the table of possible compounds. The unknown melted at 73°C, was insoluble in water, and soluble in cyclohexane. It was partially soluble in ethanol. The density of the solid was estimated to be > 1.00 g/mL due to the fact that the solid sunk in water. Which two substances from the list of possibilities could the unknown be? a. b. What is the BEST choice? Defend you answer.

Explanation / Answer

Q1) Benzophenone has a melting point of 48 degree C ,which is much higher than normal room temperature, so it is a solid at room temperature and becomes liquid only at temperatures higher than 48 deg C

It is largely non-polar,but due to the presence of C=O,a polar functional group so shows little solubility in non-polar cyclohexane and slightly polar ethanol ,but insoluble in highly polar solvent ,water.

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